Causes of variation in concrete yield Concrete Construction

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Causes of variation in concrete yield - Concrete

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

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Causes of Variation in Concrete Yield - Concrete Construction

1994-3-1  Concrete yield is defined as the volume of fresh-mixed 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 contractor's operation.

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Concrete Construction Article PDF_ Causes of Variation in ...

2019-9-5  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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Causes of Slump Variation Concrete Construction Magazine

Several factors can cause slump variations. If moisture content varies in the aggregate stockpile, switching from a wet to a dry portion of the pile can increase water demand. If admixtures are being used, a dispenser malfunction can result in not enough water-reducing or air-entraining admixture being added.

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Causes of Variation in Construction Project Task Starting ...

The construction process is complex and involves numerous people with different levels of responsibility, which makes identifying the root causes of the variation difficult. A nationwide survey was administered to workers, foremen, and project managers to identify the most prevalent causes and magnitude of both starting time and task duration ...

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Discrepancies in Yield — What, Why, How? – Nevada Ready

2021-8-6  An over-yield can be an indication of a problem if the excess concrete is caused by too much air or aggregate, or if the forms have not been properly filled. Differences in batched weights of ingredients and air content in concrete, within the permitted tolerances, can result in discrepancies in yield. HOW to Prevent Yield Discrepancies?

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How to Determine Concrete Yield Concrete Construction ...

2021-8-11  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.

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Core Strength Variation of In-Place Concrete Concrete ...

1995-2-1  Concrete strength varies within a single element. Tests indicate two apparent causes of strength variation: strength increase at the bottom attributed to greater static pressure caused by the concrete above and strength decrease at the top attributed to higher water-cement ratios as a

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Concrete Compressive Strength Variation with Time - The ...

Concrete structure with age is subjected to environmental conditions like rain, freezing and thawing, chemical attacks etc. An impermeable concrete can undergo moisture penetration, frequent freeze, and thaw that creates cracks in concrete. Chemical attacks can corrode the reinforcement reducing the yield strength of reinforcement.

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Types and Causes of Concrete Deterioration

2014-4-14  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.

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Identifying Causes of Variation in Construction Industry ...

Identifying Causes of Variation in Construction Industry Based on Questionnaire ... The aim of this study is to diagnose problems of quality in ready mixed concrete industry.A field survey includes open and close questionnaire have been done which aimed to get data and required information for achieving this research.The results of the ...

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

Concrete precast plants require strict control over and adherence to the timing and sequence of operations. Variation for this research is divided into the variation in task starting time (the difference between the planned and the actual starting time) and the variation in task duration (the difference between the planned and the actual task duration).

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

Concrete precast plants require strict control over and adherence to the timing and sequence of operations. Variation for this research is divided into the variation in task starting time (the difference between the planned and the actual starting time) and the variation in task duration (the difference between the planned and the actual task duration).

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On compressive strength variation in concrete SpringerLink

1971-5-1  The interrelationship of the standard deviation, the coefficient of variation, and the compressive strength of concrete was studied on 32 building sites and 14 ready-mix plants, with more than 30,000 observations analysed. While the standard deviation was found to be practically strength-independent when overall values were considered, the coefficient of variation showed such

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Causes of Time Buffer and Duration Variation in ...

As a result, construction personnel compensate for the uncertainty by adding a time buffer to absorb variations in the work plan. For the purpose of this research, a time buffer is defined as the amount of time included in task durations to compensate for uncertainty and to protect against variation.

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Types and Causes of Concrete Deterioration

2014-4-14  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.

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Different types of Deterioration in Concrete Structures

2021-1-16  Chemical attack in concrete. Chemical attack is one of the more common causes of deterioration of concrete in industry today. Animal fats, natural and artificial oils, acids, alkalis, and various industrial salts are all damaging to concrete. Chemical attack occurs due to pollution products and following discharge activity on the insulator surface.

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Effect of reinforcement grade and concrete strength on ...

2019-11-1  The increase in yield strength of steel bars is associated with the increase in the yield strain, the reduction both in the fracture elongation (ε rup), the ultimate uniform elongation (ε) (defined as the strain at the ultimate stress), the tensile-to-yield strength ratio (f t /f y, i.e. T/Y) and the length of yield plateau.The lower T/Y is believed to reduce the spread of plasticity in RC ...

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(PDF) Causes, Evaluation, and Repair of Cracks in Concrete ...

Large voids or broken areas 201.3R Guide for Making a Condition Survey of Concrete in compression zones can be filled with fine and coarse Pavements aggregate before being flooded with monomer, providing a 207.1R Guide to Mass Concrete CAUSES, EVALUATION, AND REPAIR OF CRACKS 224.1R-19 207.2R Effect of Restraint, Volume Change, and Reinforce ...

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Thermal Cracking of Concrete and Prevention - The

🕑 Reading time: 1 minute Thermal Cracking of Concrete and Prevention Temperature difference within a concrete structure may be caused by portions of the structure losing heat of hydration at different rates or by the weather conditions cooling or heating one portion of the structure to a different degree or at a different rate than another portion of the structure.

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

Concrete precast plants require strict control over and adherence to the timing and sequence of operations. Variation for this research is divided into the variation in task starting time (the difference between the planned and the actual starting time) and the variation in task duration (the difference between the planned and the actual task duration).

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

2012-6-1  This study determined causes of variation in task starting time and duration of precast concrete slab production tasks. It also identified penalties associated with not reducing variation, which include an increase in project duration, Work in-Progress

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On compressive strength variation in concrete SpringerLink

1971-5-1  The interrelationship of the standard deviation, the coefficient of variation, and the compressive strength of concrete was studied on 32 building sites and 14 ready-mix plants, with more than 30,000 observations analysed. While the standard deviation was found to be practically strength-independent when overall values were considered, the coefficient of variation showed such

Get price

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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(PDF) Significant Causes and Effects of Variation Orders ...

Causes rework: Variations in construction often results Kumaraswamy et al. (1998) studying delay problems in in rework and demolition (Clough and Sears, 1994) if construction projects of Hong Kong summarized that the variations are occurred during the construction is 50% of the projects surveyed were delayed because of underway or even ...

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Cracks and Crack Control in Concrete Structures

2018-11-1  ing in concrete structures. In this paper, causes of concrete cracking are dis-cussed, including tensile strength of concrete, temperature, shrinkage and creep effects. Recommended crack widths are presented along with design methods for sizing reinforcement to control crack widths. CAUSES OF CRACKING Concrete can crack due to a number of causes.

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Causes and Management of Concrete Cracks in

concrete construction, some projects have foundation settlement, so the concrete structure begins to misalign, then the concrete structure will crack due to pressure problems, affecting the safety of the entire building. 3 Research on the causes of concrete cracking Based on

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

2017-8-5  Commentary synopsis: This report is a commentary on the “Specifications for Tolerances for Concrete Construction and Materials (ACI 117).” It is intended to be used with ACI 117 for clarity of interpretation and insight into the intent of the committee regarding the

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Causes and Management of Concrete Cracks in Construction ...

Construction projects require a significant amount of money and other resources in order to carry them out in an effective way. Cost control is a critical step in ensuring the success of the ...

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Shrinkage Compensating Concrete Construction for Slabs-on ...

The main objective of shrinkage compensating concrete is to limit the problems of cracking and curling observed in slab-on-ground. This special concrete is made of cement conforming to ASTM C 845 instead of ASTM C 150 or C 595. Hence there is a variation in the volume change characteristics of shrinkage compensating concrete

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