Subject concrete technology Q: a)What particular precautions would you take when concreting (i) In winter, and (ii) in hot weather? b)What are the effects of hot weather on fresh concrete?

Q: 3- Explain various factors affecting workability of concrete. 4- Explain the factors which effect on…

A: 3. Factors affecting workability of concrete water content : increase in cement content of concrete…

Q: Discuss the concept of high-performance concrete. Discuss some of its properties that make it…

A: - High performance concrete (HPC) is a type of concrete engineered to be stronger and more robust…

Q: Kindly answer both a and b Other wise leave it... Give me both answer I don't want single answer..…

A: a.The effect of water content on flow ability, segregation and strength of concrete: The water…

Q: The name of the test used to measure the consistency and workability of fresh concrete is called the…

A: The name of the test used to measure the consistency and workability of fresh concrete is called the…

Q: What problems are likely to occur if concrete has too low a slump? Too high a slump? How can the…

A: What problems are likely to occur if concrete has too low a slump?   Concrete with a low slump has a…

Q: The factors which affect the compressive strength of extracted concrete cores ?

A: Concrete cores are used for testing of actual properties of concrete in existing structure such as…

Q: explain wet and dry process in manufacturing of cement. which process is more environment friendly…

A: (1) calcareous and argillaceous materials are crushed separately (2) then materials are finely…

Q: A concrete masonry unit has actual gross dimensions of 190 mm * 190 mm *190 mm. The unit is tested…

A: Given, Net volume = 5125 cm3 Maximum failure load = 370 kN It is required to determine the net…

Q: Consider the following statements: The effect of an air entrainment in concrete is to 1. increase…

A: Air entrainment in concrete : Increased workability  Increased resistance to freezing and thawing…

Q: 6) What are the three methods for measurement of tensile strength of concrete? Indicate which…

A: Since, the question to be solved is not specified, the solution for question 6 is as follows: The…

Q: What is self-consolidating concrete? How are its properties achieved? Howare these properties…

A: Self-consolidating concrete or self-compacting concrete (SCC) is a concrete mix which has a low…

Q: Mixing and handling can significantly alter the air content of fresh concrete. Thus, field tests are…

A: Air entrapped concrete is used generally in areas with low temperatures and damages can occur due to…

Q: Why is extra water harmful to fresh concrete, but good for concrete after itreaches its final set?

A: Answer Introduction In the mixing of the concrete, water is the important and most useful…

Q: Explain (I) water-cement ratio, (II) the effects of varying water-cement ratio on concrete…

A: Water-cement ratio- It is defined as the ratio between the weight of water to the weight of cement…

Q: On the 28th day after concrete was mixed, a 6.00-in-diameter concrete cylinder failed in a…

A: Given data, Diameter of cylinder d = 6 in Compressive load P = 145000 lb Factor of safety γ0 = 5

Q: Describe effect of height to diameter ratio on concrete stremgth

A: Effect of H/D ratio on the strength of concrete.  H/D ratio is height to diameter ratio used to make…

Q: Explain pozzolanic reaction with hydration products and its effects on hardened concrete properties.

A: When cement is mixed with water it reacts and its constituent compounds undergo a series of chemical…

Q: Using the ACI code equation, estimate what would be the modulus of elasticity of this concrete at…

A: Modulus of elasticity of concrete= 4700f'c= 4700*4.909=23073.123 MPa As per ACI Code

Q: A normal-weight concrete has an average compressive strength of 4500 psi. What is the estimated…

A: compressive strength of concrete      = 4500psi (1)Modulus of elasticity of concrete:-

Q: Subject: Concrete technology Q: a)What are the disadvantages of using calcium chloride in Portland…

A: Portland cement is the most common type of cement that is generally used throughout the world as a…

Q: Controlling excessive temperature gradients in large concrete masses is very crucial. Explain in…

A: After the placement of the concrete, monitoring the temperature of concrete is one of the most…

Q: Discuss the rate of concrete drying shrinkage at different ages with diagram.

A: Brief concept- Drying Shrinkage- When the water content gets reduced, the change in the dimensions…

Q: Discuss the concept of concrete maturity meters.

A: The concept of concrete maturity meters are explained as below,

Q: The target mean strength of the M20 grade concrete is 27 N/mm?. What is the value of standard…

A: To Determine Value of Standard deviation, σ

Q: What are the main reasons of concrete segregation? What are the main causes of plastic shrinkage…

A: Solution: 1. Concrete segregation is defined as the process of separation of concrete into its raw…

Q: 4) Same concrete mix is cast at two locations, A and B. 1 hour after mixing, the slump loss at A is…

A: Slump loss at A is 5 cm and slump Loss at B is 10 cm.  Typically, it is caused by removing water…

Q: State the conditions under which you will recommend the following cements. Give also the reasons.…

A:

Q: A hollow concrete masonry unit has an actual gross dimension of 150mm x 200mm x 400mm (width x…

A:

Q: Air Entrained Concrete (Moderate Required Strength = 35 MPa. Required Slump = 6 inches Maximum Size…

A:

Q: 1.2 State 4 factors that can be used to balance the workability of a concrete mix. For each of these…

A: Workability  The amount of energy required to overcome friction while compacting is the feature of…

Q: 1. Explain why increasing the water content produces a weaker concrete. 2. What is heat of…

A:

Q: State and explain the qualities of good cement. Explain each qualities thoroughly

A:

Q: a) What is pozzolanic material; what benefits can be achieved by using Pozzolana with cement in…

A: Brief concept- There are several kinds of materials used in buildings for construction purposes.…

Q: A. Differentiate between plain and reinforced concrete; why concrete is reinforced? B. What is the…

A: Question is based on concrete technology . In the question we have to differentiate between…

Q: Q2 c Discuss three (3) common concrete problems due to improper concreting works that can affect…

A: Given : Common concrete problems.

Q: Given grade 60 steel rebar and 4000 psi normal-weight concrete, (a) What is the yield strength of…

A: Yield strength & modulus of elasticity of the steel; a) The yield strength of steel (fy) is the…

Q: Design a concrete mix which is already solved by using Eprical Formulas according to ACI and TS and…

A: Consider this example for designing the concrete mix Example : A concrete mix required for…

Q: 2. What is the standard size of PCC specimens to be tested for compressive strength? If a smaller…

A: 2). The standard size of the PCC specimen is used in testing is 150x150x150 mm. most 150 mm cubes…

Q: Why is it necessary to measure the air content of concrete at the job site rather than at the batch…

A: It is necessary to measure the air content of concrete at the job site rather than at the batch…

Q: Four standard concrete cylinders of 6-inch diameter cross section were tested under uniformly…

A:

Q: What is the target mean strength (N/mm²) of the M30 grade concrete, if the standard deviation is…

A: given- grade of concrete=M30⇒fck=30 N/mm2standard deviation σ=5

Q: Describe the challenge of concrete mixture design and the importance of compressiv

A: Challenges of concrete mixture design -  Bad adaptability leads to cement concrete slump loss…

Q: esults. ) The level of “Quality Control" for the produced concrete.

A: (C) Introduction : Concrete's durability can be characterised as its capacity to withstand…

Types of Cement

Cement is a fine mixture of limestone, chalk, or marl and clay which when mixed with water, becomes compacted due to the formation of strong molecular bonds. Due to hydration, cement turns into a hard mass when left for a sufficient amount of time upon mixing with water. The water turns the cement compounds into gel-like submicroscopic particles having higher surface areas. It is due to the hydration properties of cement, they are often known as hydraulic cement. For instance, Portland cement is a popular example in this category.