Deformation occurs on freshly lay concrete when it finally set or harden. discuss the various causes for dimensional changes in the hardened concrete
Q: what are the various causes for dimensional changes in the hardened concrete
A:
Q: Calculate the modulus of elasticity Ec of lightweight concrete that has a unit weight of 110 pcf and…
A: Elasticity is the property of material by which the material regains its original shape when the…
Q: 1. What are the most common applications for structural steel? 2. What is the purpose of reinforcing…
A: Structural steel plate is a flexible construction material that gives manufacturing versatility and…
Q: What is the minimum strength that concrete must reach prior to freezing so that the overall strength…
A: The minimum strength that concrete mus overall strength gain is not affected:
Q: adhesion between cement and aggregate paste more important in highly resistant concrete 5- Why is it…
A: 1.) Temperature changes could cause cracks or sapling, distress, and aggregate expansion which leads…
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: After prestressing process is completed, a loss of stress is due to A. elastic elongation of…
A: Prestressed concrete is basically concrete in which internal stress of suitable magnitude and…
Q: define the “shrinkage” problem for reinforced concrete members. What are the structural results of…
A: Shrinkage is defined as "shortening of Concrete due to drying". This causes extra stresses in the…
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: Deformation occurs on freshly lay concrete when it finally set or harden. Criticize various causes…
A: Fully cured and hardened concrete must be sufficiently robust for structural and service stresses to…
Q: 18 - Which of the following may be due to the effects of set retardants. A) All B) Pouring…
A: The main function of retarder is to slow down the setting time of cement while placing the concrete.…
Q: Discuss Sulfate Attack on Concrete
A: Sulfate attack: It is one of the causes for damage of concrete deterioration, by making concrete…
Q: A concrete is composed of a mixture 286 lbm of cement (SG = 3.11), 520 kgm gravel (SG 2.71), 260 kgm…
A:
Q: Describe the effects of C3S on the properties of concrete.
A: The hydration of cement is the process of adding water to the cement. The chemical compounds or…
Q: 2. A standard brick ( dimensions 200mm x 100mm x 65mm) is compressed lengthwise by a force Pas…
A: The given values: ,Dimension=200mm×100mm×65mm ultimate shear stress at an inclination=8M Pa and 45∘…
Q: Comprssive strength determination of m20 grade concrete
A: Compressive strength of M20:
Q: After pouring concrete into formwork, :compaction will be required because •compaction can reduce…
A: Compaction is the process of removing air entrapped from the concrete to increase the density,…
Q: EXPLAIN (flexural strength requirement for beams) a. Sectional Strength b. Equilibrium and Strain…
A: INTRODUCTION: Strength : It is basically the capacity or quality of any material ( here it is beam)…
Q: The increased surface area of manufactured aggregates (e.g. crushed stone) contributes to a more…
A: The above statement is FALSE
Q: 3) The design of a concrete mix requires 1173 kg/m3 of gravel in dry condition, 582 kg/m3 of sand in…
A: Solution: Given that, Content of gravel = 1173 kg/m3 Moisture content of gravel = 0.8%, Absorption…
Q: Using cement chemistry notation what is the hydrated cement phase MAINLY responsible for strength…
A: When water is added to cement many reactions take place between cement components and water.…
Q: Estimate the tensile strength required to prevent cracking in a concretelike material that is cast…
A: The given data is: Length of bar=1.25m =49.2126 in E=5.07*106 psi thermal…
Q: In the extreme fibre of a concrete beam, the value of compression is 5.80 MPa. The neutral axis of…
A: Given: Compressive stress = 5.80 MPa Depth of neutral axis, y = 58 mm Compressive strength of…
Q: A hollow concrete masonry unit has an actual dimension of 150mm x 200mm x 400mm (W x H x L). The…
A:
Q: Q1) What is retrofitting of concrete structures? (CO2-PO2, C1)
A: Retrofitting is strengthening the building , either for dilapidated building or deteriorated…
Q: Discuss the different types of volume change in concrete at early and long-term ages.
A: Answer:- Volume change of concrete: Concrete changes somewhat in volume for several reasons, and…
Q: Explain pozzolanic reaction with hydration products and its effects on hardened concrete properties
A: Pozzolanic material are siliceous and aluminium material in which themselves posses little or no…
Q: A 150mm x 300mm long cylindrical concrete specimen was tested for tensile strength. The sample…
A:
Q: What is the purpose of concrete cube test
A: Concrete cube test. The test involves the cube specimen of concrete which are required to find…
Q: Discuss the rate of concrete drying shrinkage at different ages with diagram.
A: The phenomenon that occurs due to the loss of moisture present in pores of the hardened paste of…
Q: Explain the properties of fresh and hardened concrete? Explain in details about the determination of…
A: Property of Fresh concrete is workability, which is the ease with which concrete can be mixed,…
Q: A project specifies a concrete strength of at least 3000 psi. Materials engineers will design the…
A: It is required to determine the compressive strength of the mix. It is required to determine the…
Q: Good concrete can be achieved when it is well prepared. Explain the requirement during the…
A:
Q: Pick up the correct statement from the following: A The concrete gains strength due to hydration of…
A: Important aspect of concrete : The strength of concrete increases with age Concrete does not set at…
Q: Concrete is required for a column that will be Severe Exposure to freezing and thawing. The cross…
A: Given data:- The cross-section of the column is, =300 mm×300 mm The smallest spacing between the…
Q: Temperature of Mass Concrete can be controlled by using various techniques. Please suggest numerous…
A: Using fly ash with the same amount of cement can reduce the heat of hydration of concrete. And this…
Q: Which of the following is NOT a benefit of using SCMs? Increase required concrete curing time…
A: Supplementary cementing materials are generally added to concrete to make concrete mixtures more…
Q: Q.2- Answer with true and false, and correct false statements. 1- Loading time of concrete starts…
A: Part 1 Loading of concrete starts from placing of concrete rather than mixing. Hence False Part 2…
Q: Discuss and conclude Surface Hardness Test On Concrete
A: Rebound Hammer Test:It is a surface hardness tester for which an empirical correlation has been…
Q: H.W (4) (A) Give reasons: Very early strength of concrete increases if temperature during placing…
A: Note:- Hi! Thank you for the question As per the honor code, We’ll answer the first question since…
Q: why do we need to know the Specific Gravity and Absorption of Fine Aggregate, Surface Moisture of…
A: (1) Specific Gravity: Since, specific gravity is the ratio of densities. Therefore, specific gravity…
Q: If the overall temperature of the concrete exceeds the concrete may flash set. O 120F O 100F O 110F…
A: Ans - 100 F at 100 F setting time is 1-2/3 hours. The setting time of concrete decreases with a rise…
Q: Permeable void Impermeable voids (a) (b) (c) (d) FIGURE 5.9 Voids and moisture absorption of…
A: Reaction of water for different conditions are as followed :
Q: 1-What is the bond strength between steel and concrete and how it can be calculated? 2-What is the…
A: 1.Bond Strength:- Bond Strength is defined as the force which resist the separation of two…
Q: what is the value of gel porosity in concrete ?
A: Brief Concept Introduction: Concrete: It is the mixture of cement (binding material), aggregates,…
4b. Deformation occurs on freshly lay concrete when it finally set or harden.
discuss the various causes for dimensional changes in the hardened concrete.
Step by step
Solved in 2 steps
- You are assigned to monitor the concrete strength gain at a construction site. The ultimate compressive strength of the concrete at its full maturity is 450 kg/m. The average concrete temperature at the construction site is 25 °C during the day and 15 °C during the night (assuming 12-hour day/night cycles). If you assume that the datum temperature (To) is - 10 °C, estimate the strength of concrete after 14 days. (4=35, B=51)Maturity Index, M = E(T - To).Discuss the rate of concrete drying shrinkage at different ages with diagram.Calculate the modulus of elasticity Ec of lightweight concrete that has a unit weight of 110 pcf and compare it to the modulus of elasticity Ec of a normal weight concrete. Both concretes have compressive strengths (f’c) of 4000 psi. Express the solutions in psi units. Please also explain why the values are different.
- As follows: 1- The reason for the decrease in concrete resistance when the temperature rises? 2- Reasons for preferring ready-mixed concrete over other types of concrete? 3- Why is it not preferred to mix concrete for a period of time more than required? 4- Why is adhesion between cement and aggregate paste more important in highly resistant concrete 5- Why is it important to get rid of the isolation phenomenon in soft concrete?1. What are the most common applications for structural steel?2. What is the purpose of reinforcing steel in concrete? Discuss the qualities of reinforcing steel in general.3. Discuss briefly four kinds of heat treatment used to improve the characteristics of steel. What are the benefits of each kind of treatment?A hollow concrete masonry unit has actual gross dimensions of 190 mm * 190 mm* 390 mm (width * height * length). The unit is tested in a compression machine with the following results: Failure Load = 1110 kN Net volume of 6 * 106 mm3 a. Calculate the gross area compressive strength. b. Calculate the net area compressive strength.
- Q. Using the British methods, design a concrete mix to bear an average compressive strength of 35 MPa at 28 days, to cast a room slab with the following dimensions (5 width x 4 length x 0.2 depth m) and 200 mm space distance of reinforcement. Consider the following properties: o Cement used is type I Portland cement ® Required slump = 30 — 60 mm o Coarse aggregate: ® Crushed rocks * Maximum size of 40 mm, e The fine aggregate: * Crushed rocks = Falls in zone 3 o Assume zone A for figure 1 o AssumeK = 1.64what is the value of gel porosity in concrete ?Please answer. Thank you! Concrete has a coefficient of linear expansion of 12x10-6 /0 C and considering a large concrete structure and typical temperatures during summer and cold seasons. a. Will there be a change in concrete’s linear size between summer and cold seasons? Explain your answer. b. If there is a change in its linear size, how would this change be accommodated?