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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Chapter 7, Problem 7.10QP
The design of a concrete mix requires 1173 kg/m3 of gravel in dry condition, 582 kg/m3 of sand in dry condition, and 157 kg/m3 of free water. The gravel available at the job site has a moisture content of 0.8% and absorption of 1.5%, and the available sand has a moisture content of 1.1% and absorption of 1.3%. What are the masses of gravel, sand, and water per cubic meter that should be used at the job site?
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3) The design of a concrete mix requires
1173 kg/m3 of gravel in dry condition,
582 kg/m3 of sand in dry condition, and
157 kg/m3 of free water required. The
gravel available at job site has a
moisture content of 0.8 % and absorption
of 1.5 %, and the available sand has a
moisture content of 1.1 % and absorption
of 1.3 %. Determine:
- the masses of gravel,
sand and water per
cubic meter that
should be used at job
site and the theoretical
unit weight of the mix.
- Assume that the
same volume of dry
coarse aggregate was
replaced by dry
lightweight aggregate
of low bulk specific
gravity (0.6 g/cm3) and
M=5%, A=5%. What
would be the new
theoretical unit weight
?
The design of a concrete mix requires 1173 kg/m3 of gravel in dry condition, 582 kg/m3 of sand in dry condition, and 157 kg/m3 of free water. The gravel available at the job site has a moisture content of 0.8% and absorption of 1.5% and the available sand has a moisture content of 1.1% and absorption of 1.3%. What are the masses of gravel, sand and water cubic meter that should be used at the job site?
A batch of concrete consisted of 200 lbs fine aggregate (sand), 400 lbs coarse aggregate(gravel), 95 lbs cement, and 5 gallons of water. The relative density of the sand and gravel may be taken as 0.65 and that the cement as 3.10 What was the total volume ofconcrete produced?
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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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- A concrete mix with a 75 mm slump, w/c ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1009 kg/m3 of coarse aggregate. Compute the required mass of coarse aggregate per cubic meter. To adjust the mix so as to increase the compressive strength, the water–cement ratio is reduced to 0.45. Will the quantity of coarse aggregate increase, decrease, or stay the same? Explain your answer.arrow_forwardCalculate the required adjustment to the amount of mixing water per cubic yard of coffee to maintain a combatant w/c ratio. Mention if water is added or removed from the mixture. The concrete producer plans to use aggregate from the stockpile: 1920 Ibs/yd^3 coarse aggregate and 1160 Ibs/yd^3 of fine aggregates, properties of aggregate are: Coarse aggregate: Absorption capacity= 3.5% Total moisture= 4.3%. Fine aggregate: Absorption capacity= 1.4% Total moisture= 0.8%arrow_forwardYou want to increase the sustainability of a concrete mixture by replacing 35% of the portland cement by mass with a locally available natural pozzolan that can be used in place of ordinary portland cement (CEMPOZZ). The quantity of cement in the concrete mixture is 620 lb/yd3. You can assume that the specific gravity of portland cement and CEMPOZZ are the same for this problem. What is the quantity of CEMPOZZ for the mixture? Round to the nearest whole number and do not include units when entering your answer.arrow_forward
- A concrete mix with a 75 mm slump, w/c ratio of 0.50, and sand with a fine-ness modulus of 2.4 contains 1009 kg/m3 of coarse aggregate. Compute therequired mass of coarse aggregate per cubic meter. To adjust the mix so as toincrease the compressive strength, the water–cement ratio is reduced to 0.45.Will the quantity of coarse aggregate increase, decrease, or stay the same?Explain your answer.arrow_forwardWhat is the w/cm for the following 1 m3 batch of concrete? Express your answer with 2 decimal places. Material Batch mass, kg Cement 250 Pozzolan 84 Fine aggregate (absorption 0.8%. moisture content, 4%) Coarse aggregate (absorption 0.4%. moisture content 1.5%) Water added to the batch mix 623 1177 116arrow_forwardA batch of concrete consisted of 200 lbs fine aggregate (sand), 400 lbs coarse aggregate(gravel), 95 lbs cement, and 5 gallons of water. The relative density of the sand andgravel may be taken as 0.65 and that the cement as 3.10 What was the total volume ofconcrete produced?arrow_forward
- Determine the quantities of materials required per cubic yard to create a concrete mix. The specifications require a maximum size aggregate of 1½ in., a minimum cement content of 5½ sacks per cy, and a maximum water- cement ratio of 0.60. Assume 6% air voids (cement, 470 lb per cy; water, 4.52 cf/cy; fine aggregate, 1,068 lb/cy; coarse aggregate, 1,986 lb/cy).arrow_forwardA batch of concrete is composed of 200 lbm fine aggregate, 350 lbm coarse aggregate, 94 lbm cement, and 5 gallons of water. The specific gravity of the fine and coarse aggregate is 2.65, and that of the cement as 3.10. What is the specific weight of concrete in lb/ft³?arrow_forwardStrength requirements, in MPa – 30.68 Mpa Water cement ratio, in decimal – 0.45 Coarse aggregate requirements (dry), in kg/m3 – 992.kg/m3 Air content, in percent – 3.5% Water content, kg/m3 – 184 kg/m3 Cement, in kg/m3 – 408.89 kg/m3 Determine the Admixtures in ml/m3 Fine aggregate requirements (dry), in kg/m3 Net Water Content, in kg/m3arrow_forward
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