Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Textbook Question
Chapter 7, Problem 7.19QP
Why is extra water harmful to fresh concrete, but good for concrete after it reaches its final set?
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Chapter 7 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 7 - The design engineer specifies a concrete strength...Ch. 7 - A project specifies a concrete strength of 24.1...Ch. 7 - A project specifies a concrete strength of at...Ch. 7 - What is your recommendation for the maximum size...Ch. 7 - A concrete mix with a 3-in. slump, w/c ratio of...Ch. 7 - Prob. 7.6QPCh. 7 - You are working on a concrete mix design that...Ch. 7 - Design the concrete mix according to the following...Ch. 7 - Design the concrete mix according to the following...Ch. 7 - The design of a concrete mix requires 1173 kg/m3...
Ch. 7 - Prob. 7.11QPCh. 7 - Prob. 7.12QPCh. 7 - Students in the materials lab mixed concrete with...Ch. 7 - Students in the materials lab mixed concrete with...Ch. 7 - Why is it necessary to measure the air content of...Ch. 7 - What do we mean by curing concrete? What will...Ch. 7 - Discuss five different methods of concrete curing.Ch. 7 - Draw a graph showing the typical relation between...Ch. 7 - Why is extra water harmful to fresh concrete, but...Ch. 7 - Discuss the change in volume of concrete at early...Ch. 7 - Discuss the creep response of concrete structures....Ch. 7 - Prob. 7.22QPCh. 7 - On one graph, draw a sketch showing the typical...Ch. 7 - Using Figure 7.34, a. Determine the ultimate...Ch. 7 - Three concrete mixes with the same ingredients,...Ch. 7 - Three concrete mixes with the same ingredients,...Ch. 7 - Three 100 mm 200 mm concrete cylinders with water...Ch. 7 - Students in the materials class prepared three 4 ...Ch. 7 - Three 150 mm 300 mm concrete cylinders with water...Ch. 7 - Three 6 in. 12 in. concrete cylinders with water...Ch. 7 - A normal-weight concrete has an average...Ch. 7 - Discuss the significance of the compressive...Ch. 7 - What is the standard size of PCC specimens to be...Ch. 7 - Prob. 7.34QPCh. 7 - What is the purpose of performing the flexure test...Ch. 7 - What are the advantages of using a third-point...Ch. 7 - Consider a standard flexural strength specimen of...Ch. 7 - To evaluate the effect of a certain admixture on...Ch. 7 - To evaluate the effect of a certain admixture on...Ch. 7 - Prob. 7.40QPCh. 7 - Prob. 7.41QPCh. 7 - A normal-weight concrete has an average...Ch. 7 - Three batches of concrete were prepared using the...Ch. 7 - Three batches of concrete were prepared using the...Ch. 7 - Prob. 7.45QPCh. 7 - Prob. 7.46QPCh. 7 - Discuss two nondestructive tests to be performed...Ch. 7 - Discuss the concept of concrete maturity meters.Ch. 7 - Discuss four alternatives that increase the use...Ch. 7 - What is self-consolidating concrete? How are its...Ch. 7 - Prob. 7.51QPCh. 7 - Two 6 in. 12 in. concrete cylinders with randomly...Ch. 7 - Discuss the concept of high-performance concrete....Ch. 7 - Comparing PCC with mild steel, answer the...Ch. 7 - Prob. 7.55QP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, civil-engineering and related others by exploring similar questions and additional content below.Similar questions
- How does the addition of air-entraining materials to Portland cement improve the concrete?arrow_forwardReflection on Green concrete technologyarrow_forwardExplain why increasing the water content produces a weaker concrete. What is heat of hydration. What is heat of hydration. What remedy to reduce the heat of hydration in a very large heat of hydration?arrow_forward
- Given grade 60 steel rebar and 4000 psi normal-weight concrete, (a) What is the yield strength of steel? (b) What is the modules of elasticity of the steel? (c) What is the steel strain at the yield point? (d) What is the concrete compressive strength? (e) What is the concrete's modulus of rupture per ACI318-19? (f) What is the concrete' ultimate compressive strain?arrow_forwardSubject 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?arrow_forward6) What are the three methods for measurement of tensile strength of concrete? Indicate which methods give the highest and the lowest tensile strengths for a given type of concrete with the same f'c.arrow_forward
- Explain the effects of chemical and pozzolanic admixture on the fresh and hardened properties of concrete ? Help mearrow_forwardIf the overall temperature of the concrete exceeds the concrete may flash set. O 120F O 100F O 110F O 90Farrow_forwardSelf-healing concrete. Explain why that strategy and how it can help in the product development process please provide clear explanationarrow_forward
- 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:arrow_forwardChapter 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 ksiarrow_forwardContraction joints: O A All of the above O B) Allow the concrete to move both horizontally and vertically OC) Minimize random cracks O D) Should be cut to a depth of one-half the slab thickness The most common method for placing concrete for sidewalks is O A) Buckets and Cranes O B) Chutes OC) Conveyors O D) Pumping What is the effect on the properties of hardened concrete if plastic concrete freezes for an extended period after placing? OA) All properties will be enhanced in quality O B) No effect on concrete properties OC) All properties will be reduced in quality O D) Concrete strength decreases but freeze/thaw resistance increases Bull floating is done: OA Immediately after hand floating O B) Immediately after bleed water has evaporated OC Before screeding O D) Immediately after screedingarrow_forward
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