SITUATION.The basic data for proportioning trialbatches for normal weight concretewith an average with an compressivestrength of 35 MPa at 28 days are asfollows:Slump = 75 mm to 100 mmWater-cement ratio by weight = 0.48Specific gravity of cement = 3.15Specific gravity of coarse aggregate =2.68Specific gravity of fine aggregate = 2.64Water (net mixing) = 180 kg/m^3Concrete unit weight = 23.6 kN/m^3 What is the approximate combined weight (kN) of water, cement, coarseaggregate, if the volume of dry rodded coarse aggregate is 0.38 m^3/m^3?a. 13.5b. 15.5c. 19.9d. 21.8How many m3 of entrapped air present for every m^3 concrete mixture?a. 0.01b. 0.1C. 0.015d. 0.001If the combined solid volume of cement, water, coarse aggregate andentrapped air is 0.65m^3, what weight (kN) of dry sand is required?a. 15.9b. 13.0c. 11.6d. 9.1

w/c ratio = 0.48 Water content = 180kg/m3

The basic data for proportioning trial batches for normal weight concrete with an average with an compressive strength of 35 MPa at 28 days are as follows: Slump = 75 mm to 100 mm Water- cement ratio by weight = 0.48 Specific gravity of cement = 3.15 Specific gravity of coarse aggregate = 2.68 Specific gravity of fine aggregate = 2.64 Water (net mixing) = 180 kg/m^3 Concrete unit weight = 23.6 kN/m^3

The basic data for proportioning trial batches for normal weight concrete with an average with an compressive strength of 35 MPa at 28 days are as follows: Slump = 75 mm to 100 mm Water- cement ratio by weight = 0.48 Specific gravity of cement = 3.15 Specific gravity of coarse aggregate = 2.68 Specific gravity of fine aggregate = 2.64 Water (net mixing) = 180 kg/m^3 Concrete unit weight = 23.6 kN/m^3

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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Total of three compressive strength tests were conducted for three 28-day concrete specimen of each batch of concrete. The results were presented in the table below. Batch Test 1 Test 2 Test 3 Concrete 29.163 28.380 29.220 1 Concrete 31.773 31.416 29.619 2 Concrete 29.55 30.60 32.77 Compute the Modulus of Elasticity (GPa) of Concrete 2. Use the formula of modulus of elasticity provided in the NSCP 2015 for normal weight concrete.
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PROBLEM 1 Given the following parameters, design a Concrete Mix Design ACI Method Required average strength will be 28MPa with slump of 75 to 100mm. The coarse aggregate has a nominal maximum size of 25 mm and a dry-rodded mass of 1900kg/m'. Other properties of the ingredients are: Cement Type I specific gravity 3.15 Coarse aggregate bulk specific gravity 2.75 absorption 3% Fine aggregate bulk specific gravity 2.68 absorption 1.2 % fineness modulus 3 Adjustment for Aggregate Moisture: Tests indicate total moisture of 5 percent in the coarse aggregate and 8 percent in the fine aggregate.