How to calculate the volume of concrete on the floor. How to calculate a cube of concrete and the total volume required for tape, slab, columnar bases
Calculations for slab foundation
- We work with a columnar foundation
- Strip foundation
- Leveling the floor
- Filling holes under the fence
By planning construction works, pay special attention to the calculation stage. This will allow the purchase of components, eliminating the likelihood of their subsequent shortage, or vice versa, the formation of unnecessary residues. To cope with the task is simple. But sometimes difficulties arise, in particular, regarding how to calculate how to calculate how many cubes of concrete are needed for the foundation. This is not surprising, because it must be poured evenly so that it can dry well afterwards. The strength of the support, its reliability and durability depends on this.
The above criteria guarantee the quality of the building, exclude its deformation and cracking of the walls as a result of skewing, which can happen when the base subsides unevenly. Help is needed here. The main criterion is the type of foundation. The subtleties of calculations will depend on him.
How to calculate how many cubes of concrete you need: pouring a slab structure
We are talking about a monolithic slab. While figuring out how to calculate how much concrete is needed for the foundation, output the volume of the platform by multiplying the area (S) by the thickness. The first is calculated as follows: the length is multiplied by the width. For example, if you are building a house with sides 6 and 6 m, S equals 36 m 2. The minimum thickness of the concrete mortar ball is 10 cm. So we form the formula: 36x0.1 \u003d 3.6 m 3, having learned how much concrete is needed for pouring. When planning a more solid twenty-centimeter structure, prepare 7.2 m 3 of the batch, etc.
Often, to increase the strength of the site, stiffeners are equipped, placing them in the longitudinal and transverse directions. They are located at the bottom of the slab, and the top remains level. Determining what mass of concrete must be prepared for pouring the recesses, calculate their total length and S of the cross section.
For example, for the above dimensions, at a step of 3 m, 6 structural recesses will be provided - 3 along and 3 across. The length of each is 6 m, the length is 36 m. The height (H) of the stiffeners is equal to the foundation being built. The section is made rectangular or trapezoidal. The width of the RZ will be 0.8-1 from N. So the S edge of a 10-centimeter slab will be: 0.1x0.08 \u003d 0.008 m 2.
The total volume when multiplied by 36 m 2 is 0.288 m 3. According to the given example, the volume of RJ is calculated for more impressive slabs. After the two received indicators are added. So you can easily calculate how many cubes of concrete are needed to equip the planned foundation.
How to calculate how many cubes of concrete you need: columnar foundation
Everything is simple here. We determine the number of columns. We measure their height and cross-sectional area. The last two parameters are multiplied. If you are mounting round poles, S is determined by multiplying the radius by 3.14. It is not difficult to calculate the amount of batch. Multiply the output by the number of pillars.
How to calculate how many cubes of concrete you need: strip foundation as the most popular option
A strip foundation is considered the most common type for a private house with one or two floors. It is suitable even for brick buildings characterized by a sufficiently large weight, only in this case it will be necessary to build a more solid support, increasing its width and the level of deepening into the ground.
Due to the popularity tape technology the question of its calculation also becomes relevant. At first glance, it may seem that it is difficult to calculate how much concrete is needed for a strip foundation. But, adhering to generally accepted formulas, you can easily cope with the solution of the problem. Define the following:
- the width of the tape is usually 20-40 cm. It all depends on the characteristics of the building and the blocks or panels from which the housing is being built. The heavier the structure, the stronger and more solid the foundation must be;
- height - is determined taking into account the underground and surface parts. In total, it usually turns out about 50 cm. In some regions, it is necessary to deepen the base by 1.5 m with an H of the ground layer of 0.5 m, then 1.9 m is taken into account;
- the length of the tape - it is easy to calculate it. This is a common set of walls. Both supporting and additional structures are taken into account. For example, if our house is 6x6 and has one inner wall, the required figure is 30 m. We have added the perimeter and parameters of the inner wall.
By multiplying the listed values, you gain the ability to easily and simply calculate how many cubes of concrete are needed for the foundation. So, if you have: 0.4 m, 30 m, 1.9 m, respectively, 22.8 m 3 of concrete will be required.
You can simplify the calculation process using a special calculator. Enter the requested parameters here, after which you will see the finished result in just a couple of seconds. Having decided to calculate how much concrete is needed for pouring on a calculator, you get several significant advantages.
First, it's faster. One moment, and you have the figure of interest available. It takes longer to calculate yourself. Secondly, there can be no doubt about the accuracy of the readings, because the calculator works according to a strictly established algorithm. The main thing is to set the initial data correctly. At first glance, it may seem that it is not difficult to parse simple examples on your own. But, often we forget to convert centimeters to meters, we make other inaccuracies, calculating the wrong numbers.
The question of how to calculate how much concrete is needed to pour the foundation has been resolved. But, a similar task will arise before us again when it comes to interior work in the house, leveling the floor. Here, too, it is necessary to determine the volume, so as not to break away from the workflow to purchase the missing product. The floor is leveled with Portland cement mortar, because this option is considered the most preferable. Unlike self-leveling mixtures, it is more affordable, allows you to negate significant level differences and surface defects.
How to calculate how many cubes of concrete are needed to level the floor
It is important to figure out exactly how to calculate how much concrete is needed on the floor. If you incorrectly determine the tonnage of the solution, prepare it less, then you will need to buy additional ingredients. It is better not to allow such situations, because a high-quality screed must be poured at one time. Therefore, we will study all the features of the calculations in order to avoid mistakes.
We multiply the following values:
- floor area. We multiply the width by the length;
- screed thickness. Everything is simple here;
- consumption factor 1.02.
For example, S of the floor is 30 m 2, the thickness of the screed is 0.05 m. To carry out the work, we need 1.53 m 3 of cement mortar. The situation is more complicated when there are drops on the basis. Then the height of the concrete layer is determined at the lowest point (the largest figure is taken).
We need to know the volume in order to highlight the components that need to be purchased. So be guided by the following:
- in the construction documentation it is indicated that 490 kg of binder is required to prepare one cubic meter of cement composition. Leveling the floor is allowed using a dry composition of the brand not lower than M400. Moreover, the higher the brand, the more sand you can add;
- multiplying the cubic capacity and the original unit - 490, we get a figure that explains how much binder to buy. It is better to make a purchase with a small margin, but not too significant, because the remains of the dry composition are difficult to store, when moisture enters the package, the cement hardens and becomes unsuitable for further use;
- there is sand in the leveling mortar. It is used with Portland cement in a 3: 1 ratio. That is, if we take one bucket of binder, we should take 3 buckets of sand. Thus, the above derived indicator is multiplied by 3, we get the desired volume fraction. calculation of concrete
Important! There is water in the slurry. But, we do not take it into account. It does not affect the cubic capacity of the finished composition, because it fills the voids formed between the grains of the binder and grains of sand. You cannot use industrial water for cooking, because it will reduce the strength of the finished mixture. The water must be clean, free of impurities.
We build a fence of our own site
If you decide to build a fence, do it using metal pipes embedded in a hole filled with concrete, here you also need to carry out the appropriate calculations in order to determine the volume fraction of the components.
Understanding how to calculate how much concrete is needed in a hole, we will initially determine its capacity. It has the shape of a cylinder, respectively, you need to multiply the height of the hole and the S section (radius multiplied by a constant value of 3.14). So we find out the cubic capacity that will be required to fill the recess. But, keep in mind that there will be a metal pipe inside it. Its volume, lowered into the hole, is calculated according to the same formula, only the length of the deepened part of the pipe is taken as the height. Now we subtract the smaller one from the larger indicator, getting the figure of interest to us. Especially complicated calculations were not necessary. Now you can purchase material, plan and carry out work. calculation of concrete
Try to be very responsible in the choice of dry mixes, because the quality factor of the frozen site depends on their quality. Pay attention to the brand of the binder, which becomes the main criterion for the purchase, to the presence of plasticizers, water repellents, and other components and additives that improve performance.
Remember that the concrete solution is prepared using sand. Only the ratio of the components differs. The less baking powder, the stronger the hardened base. Buy a free flowing medium baking powder to ensure good adhesion to other ingredients.
This artificial stone is used in almost all types of work, be it construction new design or reconstruction (repair) of an existing one. The solution is always poured into a certain form, in which it solidifies. Calculation of the required amount will prevent unnecessary waste, since the surplus simply will have nowhere to put it, given that the time for the "setting" of the mass can be quite short. And the lack of material will only "slow down" the whole process. In addition, it is necessary to correctly determine the required amount of components used to prepare the mixture.
Let's consider this issue in relation to the most used type of base - strip monolith. The amount of concrete is calculated as follows.
The total volume is determined
As a rule, many buildings also have internal load-bearing walls (partitions), under which the foundation must also be mounted. They are smaller, so all calculations are performed separately - for the outer tape and its parts inside the perimeter, although the technique is the same.
It is necessary to measure parameters such as width and length, as well as the height of the monolith. The volume of the entire structure is equal to the product of these values. If the inner parts of the tape have different parameters, then for each of them the volume is calculated separately.
Naturally, to obtain a general result, it is necessary to summarize all the calculations.
Correction factor
When calculating the volume of concrete, you need to take into account such a factor as its shrinkage. This refers to the inevitable evaporation of some of the water that was used in the preparation of the composition. In practice, after pouring the solution, it is often artificially compacted, using both vibrators and improvised means (bayonet shovel, metal rod) for this. In this case, not only a more intensive evaporation of moisture occurs, but also air "bubbles" are removed, which in total can be of a rather large volume.
Typically, an average factor of 1.015 - 1.02 is used in the calculations. Therefore, the overall result is multiplied by it.
Design features
Here you need to focus on the design of the structure. Technological holes or large openings are often left in a concrete monolith (foundation, wall), which are necessary for "feeding" various communications into the building. Sometimes there are quite a few of them. Therefore, when calculating the amount of concrete, their total volume is subtracted from the final result.
If the solution is prepared directly on site, then knowing how much concrete is needed, you can determine the required amount of its constituent parts, which should be brought to the construction site. There are quite a few sites on the Internet that have special calculators for such calculations. Still, the principle must be understood, since the "machine" does not take into account all the features of a particular construction.
For example, when installing a slab foundation, so-called "stiffeners" are arranged, which are located under the slab. They serve to increase its strength, and concrete mortar is also used for their equipment. Based on the foregoing, one conclusion suggests itself.
Indeed, in practice, calculations will have to be made not only for strip base, but also for other types and elements of any construction. For example, a columnar foundation can be represented in the form of 2 parallelepipeds: wide (sole) and narrow (directly the pillar). The same is true for the calculation of various beams, arches and slabs, especially with changing geometry.
Examples of calculating the amount of concrete
Attention! The solution is sold only in "cubes". All proportions for its self-preparation are also given on the basis of "m3". Therefore, the results of all measurements must be recorded in meters.
Tape base
Let's calculate the amount of concrete for the house 6x8 m. The foundation is 30 cm wide, the length around the perimeter is 28 m (6x2 + 8x2). Depth - 60 cm, aboveground part - 20 cm. The bases for 2 load-bearing internal walls are the same with a width of 20 cm, a total length of 12 m. The height of each part is 80 cm.
Determine the volume of the tape: 28 x 0.3 x 0.8 (0.2 + 0.6) m \u003d 6.72 m3.
The volume of the internal parts: 12 x 0.2 x 0.8 (m) \u003d 1.92 m3.
The total volume of concrete required for the foundation for the entire building: 6.72 + 1.92 \u003d 8.64 (m3).
It consists of individual posts and beams that connect them. The latter are calculated according to the above method.
The pillars have a cross section, for example, 30 cm (0.3 m). The height of each is 1.5 m. total amount - 20 pieces. They require concrete: 0.09 (0.3x0.3) x 1.5 mx 20 pcs. \u003d 2.7 m3.
The amount of mortar required for the grillage (beams) is added to this value. It turns out the total "cubic capacity" of the material.
Useful Tips
Quite often, an individual developer is faced with the question of how to calculate a cube of concrete. When determining this value, you need to focus on the type and brand of the final product. For example, heavy concrete is one thing, and foam or aerated concrete is another. Big role the size of the fractions of the components, the presence of various additives in the mixture also play a role. Only after determining all these components is the calculation made. But this is already a topic for another article, since the question of the proportion of ingredients, varying their percentage requires more detailed consideration.
It is possible to reduce material consumption by installing formwork with a smooth inner surface. For example, for a removable version - plywood, steel sheets. For non-removable formwork - expanded polystyrene plates.
If a construction of boards is used as such, then more water will go through the cracks. This will change the amount of concrete shrinkage in a larger direction, therefore, its consumption will increase.
Or any other outbuilding, the reliability of the foundation is always given priority. This is not surprising - the integrity of the entire building, its durability and, to a large extent, the safety of living or staying in it depends on the stability of the base. Many owners undertake the construction of foundations on their own, relying on recommendations for carrying out calculations and carrying out all stages of work.
It has become much easier for modern developers - in many cases they have the opportunity to order a ready-made concrete solution of the desired grade for pouring a foundation tape or slab. But it also happens that such a service is not available in the construction area, or, according to preliminary estimates, it is more profitable for the site owner to prepare the solution on his own, right at the construction site. And for this you need to know what concrete composition of concrete is needed for the foundation, the proportion of ingredients required for kneading.
Below you will find calculators for quick and accurate calculations, brief explanations on how they work.
Crushed stone prices
Calculators for calculating the weight and volume of concrete ingredients for pouring the foundation
M200 CONCRETE (strength class B15)
It may seem that for a foundation, concrete of this strength class will be weak. But it is not so. It is quite suitable for the foundation for outbuildings, for the foundations of light frame structures, for one-story houses from a log or bar. It is also widely used when pouring screeds or monolithic slabs under a garage, for arranging blind areas, paths, platforms.
The construction of a building begins with the construction of a reliable foundation, when choosing which it is important to take into account certain factors. The mistakes made will then affect the quality of the building, the correction of which will be a difficult and expensive procedure. A necessary question at this stage is to calculate how much concrete will be required on the foundation in order to meet all regulatory requirements and not spend extra funds.
Types of foundations
The main sign by which the classification of foundations is carried out is the type of structure:
- Ribbon - a strip passing under all load-bearing walls;
- Slab - a shallow reinforced slab under the entire building area;
- Columnar - a system of point supports that distribute the weight of the structure onto the ground.
The upper plane of the structure is called the edge - this is the basis for the walls, which receives the load from them. The bottom plane is called the sole and it distributes the weight to the ground.
Factors to consider when choosing a base type:
- the complexity of the project, the presence of a basement;
- materials used;
- ground water level;
- type of soil.
How much concrete is needed for the foundation
The prepared structure is poured with concrete mixture, and its quantity is determined in cubic meters.
To calculate the volume of concrete for the construction of the foundation, first check for the ability to carry the design load, taking into account the characteristics of the soil at the construction site. To bring the projected base into compliance with the specified parameters and to comply with the standards, its geometric dimensions (depth, width) and the reinforcement scheme are changed. The resulting dimensions are substituted into the calculation formulas and calculate how many cubes of concrete are needed.
Tape
When calculating concrete for a strip foundation, the following parameters are required: the length of the strip, its width and height. The height is taken as the distance from the sole to the edge. Usually the sawn-off edge is located 50-60 cm above the ground.
With the depth of the sole (the part located underground) of 160 cm and the size of its part above the ground 60 cm, the total will be 220 cm.The depth of the monolithic strip base is determined depending on the properties of the soil and on the grade of concrete.
It is important that the base of the foundation is at least 15 cm below the level of freezing of the soil.
The width of the tape depends on the weight of the building, the thickness of the walls and the soil. In accordance with the load, the required number of longitudinal reinforcement rods of the required diameter is installed in the design of the tape, the pitch and diameter of the clamps are determined.
The length of the tape is the sum of the lengths of all external and internal load-bearing walls of the house. For a cottage of 8x10 m with an internal load-bearing wall 10 m long, it will be 46 meters:
(10 m + 10 m + 8 m + 8 m \u003d 36 m) + (10 m) \u003d 46 meters.
Concrete consumption for the base of such a house with a tape width of 0.5 m and a height of 2.2 m:
46 (L) x 0.5 (W) x 2.2 (H) \u003d 50.6 cubic meters.
Platen
The cottage area is 8x10 meters equal to 80 sq.m. For example, the thickness of the slab is 25 cm.Thus, the consumption of the mixture will be:
(80 m2) x (thickness: 0.25 m) \u003d 20 cubic meters.
When calculating, it is important to take into account the weight of the building. With a heavy load, either increase the thickness of the slab or add stiffeners. They are made along load-bearing walls (including internal ones), or they form square cells ranging in size from 1.5 m to 2 m - it depends on the operating conditions. In the second case, the plate has increased rigidity and strength.
The filling of the stiffener structure will be an additional value that is added to the total consumption and is determined as follows:
(cross-sectional area of \u200b\u200bstiffener) x (total length of ribs).
Columnar
Represents pillars located at a certain step below the anchor points. To calculate the concrete for such a foundation, the values \u200b\u200bfor one support are determined and multiplied by their number.
The volume of one column, since it is essentially a cylinder, corresponds to the product of the cross-sectional area and length.
Let the diameter of the column be taken as 40 cm. S \u003d ¼πd² \u003d ¼ x 3.14 x 0.4² \u003d 0.13 sq. M. At a height of 2.2 m, the desired value is 0.29 m³.
For the final determination of consumption concrete mix for a columnar base, multiply the resulting value by the number of pillars.
The results obtained, despite the simplicity of the formulas, are quite accurate. This will help avoid unnecessary costs and order or prepare the optimal amount of concrete for pouring the foundation. However, when conducting preparatory earthworks, transportation and unloading, soil shrinkage, etc., an additional increase in the total figure by 3-10% is possible.
Before starting concrete pouring work, it is necessary to calculate the correct volume of concrete required for the job. Due to the insufficient amount of concrete, the pouring work will have to be carried out in 2 stages, which will lead to the formation of a structurally weak seam between the 2 pours. On the other hand, too much concrete is a waste of money. Fortunately, calculating a concrete project involves simply calculating the amount of space to be filled with concrete, to which add 5-10% for additional protection. For basic concrete fillings, namely, to fill a rectangular 3-D area, calculate the volume using the equation length × width × height.
Steps
Using 3-D volumetric equations
- To convert from centimeters to meters, simply divide the length in centimeters by 100. A slab that is 10.16 cm deep is 10.16 / 100 \u003d 0.10 meters deep. To convert back to centimeters, multiply by 100.
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Volume \u003d length * width * height. Multiply these three measurements to calculate the volume of the prism. In our example, the slab volume is 10 feet x 12 feet x 0.33 feet \u003d 39.6 cubic feet.
- To find the equivalent in meters, you need to use measurements in meters, not feet. 3.05 m × 3.66 m × 0.10 m \u003d 1.12 cubic meters.
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Convert volume to cubic yards or cubic meters if needed. The slab volume is 39.6 cubic meters, but unfortunately, concrete is often calculated in cubic yards. There are 27 cubic feet in a cubic yard, so you need to divide the cubic foot by 27 to convert to cubic yards. The slab volume is 39.6 / 27 \u003d 1.47 cubic meters. Alternatively, since there are three cubic yards in a cubic foot, you can divide each foot count by 3 to get the yard counts, and then multiply them to get the same answer.
- Also, concrete is calculated in cubic meters. In our example, we have already found this value. However, to convert cubic yards to cubic meters, you need to know this:
- 1 cubic yard \u003d 0.764554858 cubic meters
- 1 cubic meter \u003d 1.30795062 cubic yards
- Also, concrete is calculated in cubic meters. In our example, we have already found this value. However, to convert cubic yards to cubic meters, you need to know this:
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Find the volume of the prism using the formula: volume \u003d length * width * height. Multiply these three measurements to calculate the volume of the prism. In our example, the slab volume is 10 feet x 12 feet x 0.33 feet \u003d 39.6 cubic feet.
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Calculate the volume of any irregular shape. It is not always possible to pour concrete into rectangular shapes. For example, if you have separate foundation under the column, you cannot accurately calculate the shape using rectangular prisms. To calculate an irregularly shaped volume, first find the cross-sectional area. Then multiply the resulting area by the length of the shape. For example, if a single foundation foundation is 3 yards (2.74 m) long and the cross-sectional area is 0.25 square yards (0.21 square meters), the volume is 3 × 0.25 \u003d 0.75 cubic yards (or 2.74 × 0.21 \u003d 0.58 cubic meters).
- Among other things, some non-rectangular shapes have convenient equations for finding volume. Read the most common equations below:
- Cylinder: volume \u003d (Pi) r 2 × h, where "r" is the radius of the cylinder's circumference and "h" is its height.
- Triangular prism: volume \u003d 1 / 2bh 1 × l, where "b" is the length of the base of one of the triangular faces, "h 1" is its height, and "l" is the prism.
- Ball: volume \u003d (4/3) (Pi) r 3, where "r" is the radius of the ball's circle. While you're unlikely to ever fill a perfect ball, keep in mind that many domed shapes are balls cut in half.
- Among other things, some non-rectangular shapes have convenient equations for finding volume. Read the most common equations below:
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Buy a little more concrete than you need. As a rule of thumb, add 5-10 percent to the calculated volume, taking into account spills, losses or overhead work. Since you cannot claim in advance that you are using concrete at 100% efficiency, order a little more than you need. For example, if you calculated a volume of 20 cubic yards (15.3 cubic meters), you would order 1.05 × 20 \u003d 21 cubic yards (or 1.05 × 15.3 \u003d 16.1 cubic meters).
- If you are pouring reinforced concrete, the reinforced steel will displace the concrete slightly. Often this does not need to be taken into account. And your calculations will remain the same.
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Convert volume to weight if needed. Concrete transport is sold in volumes, and bags of concrete are sold in bulk at retail outlets. Often on the bags of dry construction mixes, information is indicated on how much "wet" concrete will be obtained from each bag. One cubic yard contains approximately 4000 feet of concrete (2400 kg per cubic meter). Therefore, if you need 2 cubic yards (1.53 cubic meters) of concrete, then you will need either (2 * 4000) 8000 feet, or (1.53 * 2400) 3672 kg of concrete. As noted above, it is better to play it safe and buy more dry concrete mix, and unused mix will still come in handy in the future.
Fast method of concreting basic slab
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Make sure you will be pouring concrete into a rectangular prism. Suppliers have developed a quick and easy system to calculate how much pour you need for concreting. This method does not require any computational processes from you, however there are two conditions for its use. First, it only works for rectangular prisms (basic boxed fills). This method is the easiest for relatively small fillings and will work fine for all rectangular prisms. Second, you need to measure your length and width in feet and your depth in inches. To convert all measurements to feet, use the information below:
- 1 yard \u003d 3 feet
- 12 inches \u003d 1 foot
- 1 meter \u003d 3.28 feet
- 30.48 centimeters \u003d 1 foot
- Now that you have your square footage, all you have to do to find the volume of the concrete pour is to divide the square footage by a specific number. The thicker your design - the lower the number, the thinner your design - the higher the number. Below are the factors for several common thicknesses. If your project's thickness isn't listed here, don't worry - in the next step, you'll learn how easy it is to calculate the ratio.
- If your project is 4 inches thick, divide the square footage by 81 to determine your volume.
- If your project is 6 inches thick, "" "" "54.
- If your project is 8 inches thick, 40.
- If your project is 12 inches thick, 27.
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Calculate other factors manually. If the thickness of your concrete project is not listed here, you can quickly calculate it by dividing 324 by the thickness of your concrete project (in inches). Now divide the area in square inches by your answer to determine the scope of your project.
- For example, our 50 square foot area is 7 inches long. And here is a calculation example:
- 324/7 = 46.28
- 50/46.28 = 1.08 cubic yards.
- For example, our 50 square foot area is 7 inches long. And here is a calculation example:
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Check out how the volume of concrete is calculated. The concrete volume (the physical space it occupies) is measured in cubic yards (yards ^ 3) or cubic meters (m ^ 3). A cubic yard is a 3-dimensional cube with each face equal to 3 feet. A cubic meter is a cube, each face of which is equal to 1 meter.
Break your concrete project into different rectangular prisms. Compared to other 3-D shapes, the volume of a rectangular prism is relatively easy to calculate, so if possible, split the entire project into one or more rectangular prisms. For example, if your project requires you to pour one rectangular slab, laid flush, that slab will be your only prism. However, if you need to fill the slab along the line of 4 straight walls, then each wall will be an independent prism, and in total - 5 prisms.
Calculate the volume of each prism. The volume of a rectangular prism can be found by multiplying its length by its width and height. For example, in the next few steps, imagine we are pouring a slab that is 10 feet (3.05 m) long, 12 feet (3.66 m) wide, and 4 inches (10.16 cm) deep.
Convert all measurements to one value. The length and width of the slab are given in feet and meters, and the height is in inches and centimeters. To solve our equation, all the calculus must be converted to one value. Since there are 12 inches in one foot, we need to divide our length in inches by 12 to get the value in feet. The slab is 4/12 \u003d 0.33 feet deep.
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