Tabulated results for fineness of cement are shown below. Which tabulation/tabulations contorms with IS recommendations Tabulation 1 Weight of Cement Weight Cement Sample Sample (WI) 110 gm 110 gm 110 gm Sr.No. Fineness of Cement Retained on 90um Sieve (W2) 1 10.53 gm 2 13.68 gm 3 10.21 gm Average 10.43% Tabulation 2 Weight of Cement Weight Cement Sample Sample (W1) 130 gm Sr.No. Fineness of Cement Retained on 90µum Sieve (W2) 1 10.50 gm 2 130 gm 13.05 gm 3 130 gm 11.65 gm Average 9.03% Tal fation 3 Weight of Cement Weight Cement Sample Sr.No. Sample (W1) Fineness of Cement Retained on 90um Sieve (W2) 100 gm 100 gm 100 gm 1 8.95 gm 2 6.75 gm 3 7.50 gm Average 7.73%

Tabulated results for fineness of cement are shown below. Which tabulation/tabulations contorms with IS recommendations Tabulation 1 Weight of Cement Weight Cement Sample Sample (WI) 110 gm 110 gm 110 gm Sr.No. Fineness of Cement Retained on 90um Sieve (W2) 1 10.53 gm 2 13.68 gm 3 10.21 gm Average 10.43% Tabulation 2 Weight of Cement Weight Cement Sample Sample (W1) 130 gm Sr.No. Fineness of Cement Retained on 90µum Sieve (W2) 1 10.50 gm 2 130 gm 13.05 gm 3 130 gm 11.65 gm Average 9.03% Tal fation 3 Weight of Cement Weight Cement Sample Sr.No. Sample (W1) Fineness of Cement Retained on 90um Sieve (W2) 100 gm 100 gm 100 gm 1 8.95 gm 2 6.75 gm 3 7.50 gm Average 7.73%

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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Pick out the correct statements from the following (Note: there may be more than one correct statement) Select one or more: A. A cement sample that have a specific surface area of 280 m2/Kg is expected to set faster than a sample of the same cement type that have a specific area of 160 m2/Kg B. Unsoundness of cement can cause cracking and even failure if the cement is restraint. C. Initial set of cement is caused by a selective hydration of C3A and C2S. D. The final set time of cement indicates the time at which the cement has completely hardened.
02-In the laboratory, 6 cubes (0.07 0.07 0.07) m were tested for compressive strength for ordinary portland cement. The results were recorded as shown in table below. Find the compressive strength of the sample for (3.7) day and compare with the Iraqi Specification (M.q.a No. 1984/5). Cube No. Force caused failure (KN)-3 days) Force caused failure (KN)-7 days I 2 62 64 95 97 3 69 93
Pick out all the correct statements from the following 1. Unsoundness of cement can cause cracking and even failure if the cement is restraint. 2. A cement sample that have a specific surface area of 280 m²/Kg is expected to set faster than a sample of the same cement type that have a specific area of 160 m²/Kg 3. The final set time of cement indicates the time at which the cement has completely hardened. 4. Initial set of cement is caused by a selective hydration of C3A and C2S. Select one: O A. # 1 and 2 O B. # 1, 2 and 3 O C. # 3 and 4 O D. # 2 and 4
Subject = Concrete technology Q: a) Why setting time test is performed on cement? b) Explain and state visual stability index, if in slump flow test there occurs clear segregation and bleeding of halo greater than 10mm in self compacting concrete? c) Propose suitable Methods of finding Workability of Dry, Normal and Self Compacting Concrete ? (Note: Write only names of Experiments)
Find the reading of the device for tensile testing of cement mortar in the unit KN if the cement mortar's tensile strength is 1.5Mpa and the dimensions of the failure section are (2 * 2.3) cm²
Two 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?
The characteristic compressive strength of concrete required in a project is 25 MPa and the standard deviation in the observed compressive strength expected at site is 4 MPa. The average compressive strength of cubes tested at different water-cement (w/c) ratios using the same material as is used for the project is given in the table. w/c(%) Average compressive strength of cubes (MPa) 45 35 50 25 55 20 60 15 The water-cement ratio (in percent, roundoff to the lower integer) to be used in the mix is
The compressive strength of samples of cement can be modeled by a normal distribution with a mean, u, of 6000 kg/cm² and a standard deviation, a, of 100 kg/cm². (a) What is the probability that a sample's strength is less than 6250 kg/cm²? Ans. 0.9938. (b) What is the probability that a sample's strength is between 5800 and 5900 kg/cm²? Ans. 0.1359 (c) What strength is exceeded by 95% of the samples? Ans. 5836.5
Practical Part Q4). 1- State the meaning of normal consistency of cement. 2- Which method is widely used to determine the fineness of cement?
all 5.21 A sieve analysis test was performed on a sample of aggregate and produced the results shown in Table P5.21. TABLE P5.21 Sieve Size, mm 25 19 12.5 9.5 4.75 2.36 Amount Retained, g 0 376.7 888.4 506.2 1038.4 900.1 live prised 1973 Sieve Size,TBA mm 1.18 0.60 0.30 0.15 0.075 Pan lusta) groads to storic Amount Retained, g 891.5 712.6 625.2 581.5 242.9 44.9 Calculate the percent passing through each sieve. Plot the percent passing versus sieve size on: a. a semilog gradation chart, and b. a 0.45 gradation chart (Figure A.25). What is the maximum size? What is the nominal maximum size?
Compressive Strength is conducted for each aggregate with 3 specimens for each no. of days of curing. The recorded maximum load when the specimen breaks are as follows 7 Days (kN) | 486.73 14 Days (kN) 28 Days (kN) 678.8 ... 746.3 3/8" Sample 513.14 694.2 754.7 360.71 679.8 759.8 7 Days (kN) 14 Days (kN) 28 Days (kN) 231.86 339.8 377.7 3/4" Sample 252.04 339.6 381.1 206.69 343.3 379.9 Compute the compressive strength, in psi, for each size of aggregate on each no. of days of curing. Please indicate if the sample passed the required strength for each no.of days of curing. Conversion: 1lb-f = 4.488 N Attach your solution on the box below, image type.
The results of an experiment to evaluate the effects of a water reducer areshown in Table P6.32.a. Calculate the water–cement ratio in each of the three cases.b. Using water reducer, how can we increase the compressive strength ofconcrete without changing workability? Refer to the appropriate case inthe table.c. Using water reducer, how can we improve workability without changingthe compressive strength? Refer to the appropriate case in the table.d. Using water reducer, how can we reduce cost without changingworkability or strength? (Assume that the cost of the small amountof water reducer added is less than the cost of cement.) Refer to theappropriate case in the table.e. Summarize all possible effects of water reducers on concrete.