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causes of variation in concrete yield concrete construction

causes of variation in concrete yield concrete construction

Causes of variation in concrete yield - Concrete Construction

Causes of variation in concrete yield By Bruce A. Suprenant W hen a contractor orders a cubic yard of concrete, he anticipates receiving a cubic yard of concrete. When a pre- cast plant batches a known quantity of ingredients, they expect to fill their forms. But what happens when the contractor can’t fill his forms with the amount of concrete he o rd e r ed or the batched ingre d i e n t s ...

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Causes of Variation in Concrete Yield - Concrete Construction

01/03/1994  Yield variations also occur because of changes in the mix proportions or tolerances in weighing out the batch. A contractor's operation can create what appears to be a concrete shortage or underyield. Contractors should investigate possible such causes for apparent concrete shortages as: deflection or distortion of wall forms by the pressure of the concrete; irregular subgrades; or forms ...

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Causes of variation in concrete yield Concrete Construction

Causes of Variation in Concrete Yield Concrete Construction. Mar 01, 1994 Concrete yield is defined as the volume of freshmixed concrete produced from a known quantity of ingredients It is determined by dividing the total batch weight by the measured unit weight of the fresh concrete Variations in yield are sometimes the result of the con's operation

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Concrete Construction Article PDF_ Causes of Variation in ...

Concrete Construction Article PDF_ Causes of Variation in Concrete Yield - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Concrete

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How to determine concrete yield - Concrete Construction

tors which will cause va r iations in yield and the tech-niques for policing yield. CALCULATING YIELD Yield is defined in ASTM C 138 as the volume of con-c r ete (per unit volume of cement) delive r ed to the job-site in response to a request for a specified number of cubic yards of concre t e . The volume of concrete produced per batch can be f i g u r ed out with this form u l a : S = (NX94 ...

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Concrete Construction Article PDF_ Causes of Variation in ...

Concrete Construction Article PDF_ Causes of Variation in Concrete Yield - Free download as PDF File (.pdf), Text File (.txt) or read online for free. Concrete

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How to determine concrete yield - Concrete Construction

tors which will cause va r iations in yield and the tech-niques for policing yield. CALCULATING YIELD Yield is defined in ASTM C 138 as the volume of con-c r ete (per unit volume of cement) delive r ed to the job-site in response to a request for a specified number of cubic yards of concre t e . The volume of concrete produced per batch can be f i g u r ed out with this form u l a : S = (NX94 ...

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How to Determine Concrete Yield Concrete Construction ...

Yet when the specified number of cubic yards of concrete has been delivered, the floor may be far from completed. Since this shortage can result from a number of factors, it will be helpful to take a look at the methods of calculating yield, the factors which will cause variations in yield and the techniques for policing yield. Yield can be ...

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concrete yield – ProBCGuide

14/12/2013  4) The concrete yield (The actual volume of concrete) (V) shall be determined by dividing weight of concrete by density of concrete V = W/D. 5) calculate % variation by using following formula P = (V-V 1)/V 1* 100 where V1 is volume of concrete as per batch ticket. How to avoid Yield Discrepancies? 1. Calculate yield of concrete as per above ...

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Minimizing Concrete Color Variations - Concrete Construction

Minimizing Concrete Color Variations. By Concrete Construction Staff. What causes color differences in a cast-in-place concrete wall? Cement is usually the main contributor to the color of concrete. Cements from different plants almost always show color differences. Increasing the cement content or decreasing the water-cement ratio usually darkens the color. Water absorption into the form

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Concrete Slump Variations at Site: How to Deal with it ...

The concrete slump variation from one transit mixer to another is generally due to aggregate moisture content, concrete temperature, mixing process; and time of delivery, waiting, and unloading. Sometimes, the concrete slump variations at site raises disputes between the parties involved in the construction

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Concrete Compressive Strength Variation with Time - The ...

The concrete strength variation with age can be studied by different methods. The figure-1 below shows the strength variation of a concrete present at dry and wet condition. This graph is based on the study conducted by Baykof and Syglof (1976). They found that, in dry conditions, after 1 year there is no increase in concrete strength, as shown in figure-1. On the other hand, the strength of ...

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Types and Causes of Concrete Deterioration

The exceptional durability of portland cement concrete is a major reason why it is the world’s most widely used construction material. But material limitations, design and construction practices, and severe exposure conditions can cause concrete to deteriorate, which may result in aesthetic, functional, or structural problems. Concrete can deteriorate for a variety of reasons, and concrete ...

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Factors Affecting Strength of Concrete - The Constructor

This means that the concrete kept at higher temperature will gain strength more quickly than a similar concrete kept at a lower temperature. However, the final strength of the concrete kept at the higher temperature will be lower. This is because the physical form of the hardened cement paste is less well structured and more porous when hydration proceeds at faster rate. This is an important ...

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ASTM C138 - ACI Density, Yield, and Air Content of Concrete

Yield is used to determine if the concrete supplier has delivered the amount of concrete ordered. For example, if the contractor orders 7 yards and the concrete pour comes short of filling the structure, a yield test can be performed to determine if 7 yards were actually delivered. To calculate yield, follow these simple steps. Note that you must calculate density prior to calculating yield ...

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concrete yield – ProBCGuide

14/12/2013  4) The concrete yield (The actual volume of concrete) (V) shall be determined by dividing weight of concrete by density of concrete V = W/D. 5) calculate % variation by using following formula P = (V-V 1)/V 1* 100 where V1 is volume of concrete as per batch ticket. How to avoid Yield Discrepancies? 1. Calculate yield of concrete as per above ...

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Causes and Penalties of Variation: Case Study of a Precast ...

06/06/2012  Management effort should be devoted to eliminate causes of variation in the planning stage to make a reliable work plan. The results will help prefabricators to understand causes and penalties of variation, which is the starting point of attacking and reducing it. Although this study is based on a concrete slab production facility, this research can have a broader effect on the construction ...

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Types and Causes of Concrete Deterioration

The exceptional durability of portland cement concrete is a major reason why it is the world’s most widely used construction material. But material limitations, design and construction practices, and severe exposure conditions can cause concrete to deteriorate, which may result in aesthetic, functional, or structural problems. Concrete can deteriorate for a variety of reasons, and concrete ...

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Concrete Slump Variations at Site: How to Deal with it ...

The concrete slump variation from one transit mixer to another is generally due to aggregate moisture content, concrete temperature, mixing process; and time of delivery, waiting, and unloading. Sometimes, the concrete slump variations at site raises disputes between the parties involved in the construction

get price

ASTM C138 - ACI Density, Yield, and Air Content of Concrete

Yield is used to determine if the concrete supplier has delivered the amount of concrete ordered. For example, if the contractor orders 7 yards and the concrete pour comes short of filling the structure, a yield test can be performed to determine if 7 yards were actually delivered. To calculate yield, follow these simple steps. Note that you must calculate density prior to calculating yield ...

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What Factors Causes Failure of Concrete Structures?

Fig.1: Failure of Concrete Structures Due to Various Factors. Incorrect Selection of Concrete Materials Causes Failure of Structure To build a structure that meet safety and strength requirements, it is necessary to execute construction process according to the applicable codes and specifications.

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Factors Affecting Strength of Concrete - The Constructor

This means that the concrete kept at higher temperature will gain strength more quickly than a similar concrete kept at a lower temperature. However, the final strength of the concrete kept at the higher temperature will be lower. This is because the physical form of the hardened cement paste is less well structured and more porous when hydration proceeds at faster rate. This is an important ...

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ACI 117-10 Specification for Tolerances for Concrete ...

for Concrete Construction and Materials (ACI 117-10).” The purpose of the commentary is to provide an illustrative and narrative complement to the specification; it is not a part of the specification. No structure is exactly level, plumb, straight, and true. Tolerances are a means to establish permissible variation in dimension and location, giving both the designer and the contractor limits ...

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THERMAL EXPANSION AND CONTRACTION

Thermal contraction on the concrete’s surface without a corresponding change in its interior temperature will cause a thermal differential and potentially lead to cracking. Temperature changes that result in shortening will crack concrete members that are held in place or restrained by another part of the structure, internal reinforcement or by the ground. For example, a long restrained ...

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Question: Concrete Yield Calculator? - Haener Block

Yield – Calculate the yield, Y, or volume of concrete produced per batch, by dividing the total mass of the batch, W1, by the density, W, of the concrete as shown below. How many 80lb bags of concrete make a yard? how many 80lb bags of concrete are in a yard? You will need 45 bags of concrete mix to make a cubic yard of concrete.

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