4-How the consistency of cement paste is measured? 5-State the significance of initial setting time and final setting time of cement. 6-What is the range value of compressive strength for normal concrete 7 days and 28 days?
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Concrete Technic/ Practical Part.
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- a. When is it necessary to consolidate concrete by vibration in test method C231? Discuss the process of vibration when placing and consolidating the sample.b. When rodding a layer of concrete in method C138, is it okay to hit the bottom of the measure? If not, how is it supposed to be done?c. Calculate the yield of concrete if the mass of the batch is 4800 kg and its density is found to be 350 kg/m3.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% aircontent, 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).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).
- Q1 What moisture condition should the coarse and fine aggregate be in when mixing the concrete? A Unknown B Saturated C Oven Dry D Air Dried E SSD Q2 What restriction is placed on the size of a sample of a concrete batch? A 30 L B 15 L C 20 L D 10 L E 5 LTwo batches of cement mortar with properties as shown in Table P6.18. Ifmortar cubes are made from these batches, which batch do you expect to havelarger compressive strength? Why?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 grav-ity 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 of4.8%, and absorption of 1.5%. For each cubic meter of concrete needed onthe job, calculate the mass of cement, moist gravel, moist sand, and waterthat should be added to the batch. Summarize and total the mix design whenfinished (don’t include air entrainer in summary).
- What is the effect of water–cement ratio on the permeability of hardened concrete? How does permeability affect the durability of the concrete structure?Using Figure 7.33, what is the approximate percent increase in the coefficientof permeability if the water–cement ratio increases from 0.5 to 0.6? Using thesame figure, what is the approximate percent increase in the coefficient ofpermeability if the water–cement ratio increases from 0.5 to 0.7?A: Different types of plasticizers in concrete and determine their effect on fresh concrete B: Find their slump values and setting times of each type. Also do comparison and give remarksThe 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?
- It has been determined by trial mixing that a 1:1½:3 mixture (by volume) with 5 gal water per sack of cement produces a satisfactory mixture of concrete with a 2-in slump. What quantity of mixed concrete in cubic feet will a barrel of cement produce if the following is known about cement, sand and stone aggregate? Voids Unit weight,lb Cement 0.513 94 Sand 0.360 120 Stone 0.330 105 A. 16.51 ft³B. 17.25 ft³C. 17.80 ft³D. 18.35 ft³a) For what purpose we use Ultrasonic Pulse velocity test? Also clasify the quality of concrete i Ultrasonic Pulse velocity is 3.0km/sec? b) Why and how rebound hammer is used for concretA concrete mix with a 3-in. slump, w/c ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1700 lb/yd3 of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard. 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.