I need the answer as soon as possible Consider the following statements:The effect of an air entrainment in concrete is to1. increase resistance to freezing and thawing2. improve workability3. decrease strengthWhich of these statements is/are correct?(a) 2 and 3(b) 1 and 3(c) 1 alone(d) 1, 2 and 3

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

Answered: Consider the following statements: The…

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 12.7P: Estimate the transverse tensile strength of the concrete in Problem 12.6.

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Problem 2: If f = 3 ksi what is the modulus of elasticity Ec and the maximum tensile stress fr that the concrete can carry before cracking (use ACI recommended equations). Assume a unit weight of the plain concrete is: a. Wc = 90- b. w lb lb 118- ft39 ft3) C. W = 160- Problem 3: Wight 3-6 Rugblom 4: Wight ? 7 lb ft3
A. What are the primary and secondary parameters upon which durability of concrete depends on? Discuss in detail one PRIMARY PARAMETER to which concrete is exposed in the image shown: *
Chapter 13 Question: What is the elasticity of concrete for a normal weight mix (unit weight equal to 150 pcf) with a compressive strength of 5,000 psi? O 3.644 ksi O 4.074 ksi 4,287 ksi O 3.976 ksi O 3,834 ksi
a) How various properties of aggregates affect workability of concrete? b) If the peak load of concrete cylinder in compression is 70,000 pounds, find the crushing strength of concrete? (Hint: concrete cylinder dia is 6in). SIR, PLS GIVE ME PROPER AND CORRECT ANSWER WITH FULL DETAILS. SUBJECT: CONCRETE TECHNOLOGY
Please include photos of the tables you used.
A concrete mix includes the following ingredients per cubic meter: Cement%3D400 kg Water=184 kg No admixture Table below shows possible alternatives mix ingredients. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease or approximately the same. What will happen? Cement Water Admixture (kg) (kg) Ultimate compressive Workability strength 400 225 None 449 184 None Water 400 184 Reducer Water 400 128 Reducer 400 184 Super Plasticizer 400 184 Air Entrainer 400 184 Accelerator DFocus
A1-What is the bond strength between steel and conerete and how it can be calculated? 2-What is the segregation of fresh concrete? Give its reason and how to control it? V3- What are the advantages of concrete? 3- Discuss the effect of age and curing on the compressive strength of concrete. 5-What are the main purposes of using plasticizer admixtures? 6-What are the main techniques that should be used to reduce heat of hydration in mass Coti fullowing:
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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.
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Correctly define which of the stress versus strain graphs represent the comparison of 8 ksi and 4 ksi concrete for the chart below (say left or right). Qualitatively compare the w/c ratio, elastic modulus, and brittleness. 0.000 0.003 0.000 0.003 Sean, e Sane Feure 2 Strss vesus Srain curves Feure 2. Stress vasus rain curve

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Consider the following statements: The effect of an air entrainment in concrete is to 1. increase resistance to freezing and thawing 2. improve workability 3. decrease strength Which of these statements is/are correct? (a) 2 and 3 (b) 1 and 3 (c) 1 alone (d) 1, 2 and 3