Materials for Civil and Construction Engineers (2nd Edition)
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ISBN: 9781292154411
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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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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?
The design of a concrete mix requires 1173 kg/m3of gravel in dry condition,582 kg/m3of sand in dry condition, and 157 kg/m3of free water. The gravelavailable at the job site has a moisture content of 0.8% and absorption of1.5%, and the available sand has a moisture content of 1.1% and absorptionof 1.3%. What are the masses of gravel, sand, and water per cubic meter thatshould be used at the job site?
You are working on a concrete mix design that requires each cubic meter of concreteto have 0.40 water–cement ratio, 1165 kg/m3 of dry gravel, 4% air content, and 335kg/m3 of cement (Specific Gravity = 3.15). The available gravel has a specific gravityof (S.G) gravel = 2.7, a moisture content of 1.6%, and absorption of 2.4%. The availablesand has a specific gravity of (S.G) sand = 2.5, a moisture content of 4.8%, andabsorption of 1.5%.For each cubic meter of concrete needed on the job, calculate the mass of cement,moist gravel, moist sand, and water that should be added to the batch. Summarizethe total the mix design in a table.
Chapter 7 Solutions
Materials for Civil and Construction Engineers (2nd 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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- compute for the corrected amount of water needed in the concrete mix if the mass and fine coarse aggregates are 740 kg and 1100 kg, and both have a natural moisture content of 2% and 1.5% respectively. water/cement ratio is 0.5 and the mass of ratio of concrete is 1:2:3arrow_forwardCompute for the corrected amount of water needed in the concrete mix if the mass of fine and coarse aggregates are 650 kg and 780 kg, and both have an absorption of 1.5% and 2% respectively. Water/cement ratio is 0.50 and the mass of cement is 260kg.arrow_forwardDesign the concrete mix according to the following conditions:Design EnvironmentBuilding frameRequired design strength = 27.6 MPaMinimum dimension = 150 mmMinimum space between rebar = 40 mmMinimum cover over rebar = 40 mmStatistical data indicate a standard deviation of compressive strength of2.1 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification 6.3 mL/1% air/100 kg cement.Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded)Bulk oven-dry specific gravity = 2.55, absorption = 3.6,Oven-dry rodded density = 1761 kg/m3Moisture content = 2.5,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.659, absorption = 0.5,Moisture content = 2,Fineness modulus = 2.47arrow_forward
- You are working on a concrete mix design that requires each cubic yard of concrete to have a 0.43 water–cement ratio, 1232 kg/m3 of dry gravel, 145 kg/m3 of water, and 4% air content. The available gravel has a specific gravity of Ggravel = 2.60, a moisture content of 2.3%, and absorption of 4.5%. The available sand has a specific gravity of Gsand = 2.40, a moisture content of 2.2%, and absorption of 1.7%. Air entrainer is to be included using the manufacturers specification of 6.3 mL/1% air/100 kg cement. For each cubic meter of concrete needed on the job, calculate the weight of cement, moist gravel, moist sand, and water that should be added to the batch. Summarize and total the mix design when finished.arrow_forward3) Students in the materials lab mixed concrete with the following ingredients:9.7 kg of cement, 18.1 kg of sand, 28.2 kg of gravel, and 6.5 kg of water. The sand has a moisture content of 3.1% and an absorption of 4.2%. The gravel has a moisture content of 3.4% and an absorption of 4.4%. Since water absorbed in the aggregate does not react with the cement or improve the workability of the plastic concrete, what is the water–cement ratio of this mix according to the American Concrete Institute’s weight mix design method? If a water–cement ratio of 0.5 is required using the same materials and ingredients but different amount of mixing water, what is the weight of the mixing water to use?arrow_forwardConcrete was mixed with the following ingredients: 20.7 kg of cement, 39.2 kg of sand,60.9 kg of gravel, and 14.6 kg of water. The sand has a moisture content of 3.3% andan absorption of 4.7%. The gravel has a moisture content of 3.6% and an absorptionof 4.5%. Since water absorbed in the aggregate does not react with the cement or improve the workability of the plastic concrete, what is the water–cement ratio of this mix according to the American Concrete Institute’s weight mix design method? If a water–cement ratio of 0.5 is required using the same materials and ingredients but different amount of mixing water, what is the weight of the mixing water to use?arrow_forward
- You are working on a concrete mix design that requires each cubic yard ofconcrete to have 0.45 water–cement ratio, 1165 kg/m3 of dry gravel, 4% air content, and 335 kg/m3 of cement. The available gravel has a specific gravity of Ggravel = 2.7, a moisture content of 1.6%, and absorption of 2.4%. The available sand has a specific gravity of Gsand = 2.5, a moisture content of 4.8%, and absorption of 1.5%. For each cubic meter of concrete needed on the job, calculate the mass of cement, moist gravel, moist sand, and water that should be added to the batch. Summarize and total the mix design when finished (don’t include air entrainer in summary).arrow_forwardQ. 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 = 1.64arrow_forwardThe moisture content of coarse aggregate is 0.60%. If the mass of the aggregate is 1,290 kg, adjust the mass of the aggregate. If the volume of sand is 0.30 cubic meter and its specific gravity is 1.50, what is the mass of the sand? If the mass of mixing water is 175 kg, and the required water-cement ratio is 0.65, how much cement powder is needed in the concrete mix? If the target slump of concrete is 160 mm, the maximum nominal size of the coarse aggregate is 37.5 mm, and the smallest nominal size is 9.5 mm, what is the estimated entrapped air in the ordinary concrete mix? The nominal maximum size of coarse aggregate is 25mm, the fineness modulus of coarse aggregates is 2.80, dry rodded mass of coarse aggregates is 1,100 kg and the fineness modulus of fine aggregates is 2.50. How much coarse aggregates is needed in the concrete mix? If the nominal maximum size of coarse aggregates is 25mm, what is the first estimate of air-entrained concrete?arrow_forward
- The volume of concrete required for a certain project is 20m^3. The density of concrete is 2400kg/m^3. Concrete is composed of fine and coarse aggregates, water, and cementitious materials: cement and fly ash. The ratio of fine and coarse aggregates is 2:1. Water-to-cement ratio is 0.40. Percentage of the fly ash to the total cementitious material is 0.30. Total aggregate-to-cement ratio is 5:1. Density of fine aggregates is 2680kg/m^3. Density of coarse aggregate is 2500kg/m^3. Density of water is 1000kg/m^3. Density of cement is 3150kg/m^3. Density of fly ash is 1300kg/m^3. Determine the weight required for each component. All ratios use weights. Round off your answers to the nearest tenth of a kilogram. Have one significant figure after the decimal point. Find: Weight of Fine Aggregates: Weight of Coarse Aggregates: Weight of Water: Weight of Cement: Weight of Fly Ash:arrow_forwardFor concrete production, we mix 625 kg of fine aggregate and 830 kg of coarse aggregate. The fine aggregate has a moisture content of 2.3% and absorption of 3.2%, whereas the coarse aggregate has a moisture content of 1.5% and absorption of 2.8%. Calculate the amount of water required to increase the moisture contents of both fine and coarse aggregate to reach absorption?arrow_forwardStudents in the materials lab mixed concrete with the following ingredients: 22.1 lb of cement, 41.6 lb of sand, 57.5 lb of gravel, and 14.3 lb of water. The sand has a moisture content of 3.2% and an absorption of 5.5%. The gravel has a moisture content of 3.9% and an absorption of 4.6%. Since water absorbed in the aggregate does not react with the cement or improve the workability of the plastic concrete,a.what is the water–cement ratio of this mix according to the American Concrete Institute’s weight mix design method? b. If a water–cement ratio of 0.5 is required using the same materials and ingredients but different amount of mixing water, what is the weight of the mixing water to use?arrow_forward
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