Three mortar mixes were prepared with water to cement ratios of 0.50, 0.55, and0.60. Three 2-in. mortar cubes were prepared for each mix. The cubes werecured for 7 days and then tested for compressive strength. The testresults wereas shown in Table.Determine the following:a. The compressive strength of each cube.b. The average compressive strength for each mix.MixNo.w/cRatio Cube No.MaximumCompressiveStrength (psi)Average CompressiveStrength (psi)Load (Ib)176400.502182703178901635020.551674015990148702152600.60157902.3.1.

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Answered: Three mortar mixes were prepared with…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Choose the correct answer Flash-Set is the immediate stiffening of cement paste in a few minutes after mixing with water caused by. A-Low C3A content B-High C3A content C-Low C3S content D-High C3S content
Q1) Define the C-S-H phase of cement paste. Q2) Discuss the effect of water-cement ratio on the quality of hardened concrete. Explain why this effect happens. Q3) In order to evaluate the suitability of nonpotable water available at the job site for mixing concrete, six standard mortar cubes were made using that water and six others using potable water. The cubes were tested for compressive strength after 7 days of curing and produced the loads to failure (in pounds) shown in Table: Cubes Made with Nonpotable Water Cubes Made with Potable Water 14,530 16,530 16,820 17,920 15,690 18,820 16,720 15,820 14,160 16,100 15,870 14,380 Based on these results only, would you accept that water for mixing concrete according to ASTM C94?
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We require a mix with a mean 28-day Required Average Compressive Strength of 35 MPa the size of the member and the spacing of the reinforcement require a slump of 50 mm and a maximum size of aggregate of 31 mm. Portland cement type I is used with specific gravity of 3.15, dry-rodded unit weight of coarse aggregate 1750 kg/m³ and bulk specific gravity (SSD) of 2.55. The fineness modulus of fine aggregate is 2.8 and bulk specific gravity (SSD) of 2.5 ,No air entrainment is required. Neglect water absorption and moisture content of both aggregates. The aggregates conform to the ASTM C33-84 requirements for grading. Estimate the quantity of (cement, fine aggregate, coarse aggregate and water) for 1m³ concrete.
For the beams and columns of a structure the followings are specified or determined. Design an appropriate concrete mix for this work on volumetric basis. Explain each step of the mix design. When you use the tables in the lecture notes, indicate the value you take from table. Give the final weights of each ingredient in tabular form at the end of your calculations (after doing adjustments for aggregate field moisture). Required average 28-day strength: 30 MPa Slump: 75-100 mm Dmax: 19 mm Dry rodded unit weight of coarse aggregate: 1700 kg/m’ ASTM Type I cement with Specific gravity=3.25 Non-air entrained concrete Density of water= 1000 kg/m³ Table 1. Aggregate information Moisture Absorption сараcity 1.2 % SSD Bulk Fineness specific gravity Modulus content Coarse 2.71 0.8 % aggregate Fine aggregate 2.66 1.5 % 2.5 % 2.8 [5 pts] 4) Same concrete mix is cast at two locations, A and B. 1 hour after mixing, the slump loss at A is 5 cm and the slumn loss at R is 10 cm Could vou…
What is water cement ratio? Compute the value of water cement ratio in the mix. Answer with 2 decimal places only.
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Three batches of concrete were prepared using the same materials and ingre- dients, except that they have water-cement ratios of 0.50, 0.55, and 0.60, respectively. The following tests were performed on specimens made of the three batches: - Compressive strength test on 100 mm × 200 mm cylinders - Center point floxure test on 100 mm × 100 mm × 300 mm bcams - Split tension test on 150 mm X 300 mm cylinders Three replicates were tested for each test. Table P7.38 shows the average fail- ure loads for the three replicates of each case. It is required to do the following: a. Complete Table P7.38 b. Using an Excel sheet, plot the relationships between water-cement ratio and compressive strength, modulus of rupture, and tensile strength on the same graph. Label all axes and curves. c. Comment on the effect of water-cement ratio on the compressive strength, modulus of rupture, and tensile strength. TABLE P7.38 w/c Ratio Compressive Strength Test Flexure Test Split Tension Test Compres- sive…
Three batches of concrete were prepared using the same materials and ingre-dients, except that they have water–cement ratios of 0.50, 0.55, and 0.60,respectively. The following tests were performed on specimens made of thethree batches:■ Compressive strength test on 4′′ * 8′′ cylinders■ Center-point flexure test on 4′′ * 4′′ * 12′′ beams■ Split tension test on 6′′ * 12′′ cylindersThree replicates were tested for each test. Table shows the average failure loads for the three replicates of each case.It is required to do the following:a. Complete Tableb. Using an Excel sheet, plot the relationships between water–cement ratio and compressive strength, modulus of rupture, and tensile strength on the same graph. Label all axes and curves.c. Comment on the effect of water–cement ratio on the compressive strength, modulus of rupture, and tensile strength.
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What is the weight of fine aggregates in kilograms needed for the design mix? Use three decimal places in the computation of volumes Use two decimal places for the computed weight of fine aggregates
Note:hand written solution should be avoided.

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