3. The normal consistency of cement is determined using Vicat's apparatus. In one of the trials, you have set to find the consistency of the cement paste when water of 25% by weight of dry cement is to be added. If the mass of the dry cement is 280 g, how many milliliters of water should be added? Should you increase the percentage of water to be added when the rod penetration is 20

3. The normal consistency of cement is determined using Vicat's apparatus. In one of the trials, you have set to find the consistency of the cement paste when water of 25% by weight of dry cement is to be added. If the mass of the dry cement is 280 g, how many milliliters of water should be added? Should you increase the percentage of water to be added when the rod penetration is 20

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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Tabulated results for consistency of cement are shown below. What is the water cement ratio correspond to standard consistency of the cement? Trial Mass of cement (gm) Mass of water (gm) Penetration (mm) Water-cement ratio (%) 1 60 30 10 2 60 19 6 3 60 25 8 4 60 10 2
4. Below are tabulated a number of compressive strength values that were measuredon a single cement specimen. Compute average and standard deviation ofcompressive strength values, unit with MPa. 57 59 52 55 60 58 56 53
2. A sample of fine aggregate weighs 501.2 g when SSD and 491.6 g when OD. The flask weighs 540.6 g when filled with water and 843.1 g when filled with the aggregate sample and water. Calculate the bulk specific gravity, apparent specific gravity and percent absorption.
The results of a laboratory proctor test are shown below: No.of Test 2 3 4 Wt.of Mould & Soil (Kg) Water content (%) 3.526 3.711 3.797 3.906 3.924 3.882 8.33 10.40 12.23 16.20 17.92 20.39 The mould is 12.7 cm. high and has an internal diameter of 10 cm., The weight of the Empty mould is 1.89 kg. 1) Plot the moisture content vs. dry density curve and determine the optimum moisture content and the max dry density. %3D (1) Plot the zero air content curve and 10% air content curve. Given G = 2.68.
The following information is available from a specific gravity test on fine aggregate: wt of SSD sand = 509 g wt of pycnometer plus sand plus water = 2665g wt of pycnometer plus water = 2329 g wt of oven dry sand = 491 g Calculate the bulk specific gravity (SSD), bulk specific gravity, apparent specific gravity, and absorption (dry) of the material.
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.
Three samples of fine aggregate were taken from the same stockpile and have the properties shown below. Determine in percentage: (a) total moisture content of each sample, (b) free moisture content of each sample, and (c) the average values of each from the stockpile. Measure Wet Mass (g) Dry Mass (g) Absorption (%) A 521.0 491.6 2.5 Sample B 522.4 491.7 2.4 C 523.4 492.1 2.3
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 ft³
In a ready-mix plant, cylindrical samples are prepared and tested periodically to detect any mix problem and to ensure that the compressive strength is higher than the lower specification limit. The minimum target value was set at 27.6 MPa. The compressive strength data shown in Table P7.48 were collected. Use one system of units only as specified by the instructor. a. Calculate the mean, standard deviation, and the coefficient of variation of the data.b. Using a spreadsheet program, create a control chart for these data showing the target value and the lower specification limit. Is the plant production meeting the specification requirement? If not, comment on possible reasons. Comment on the data scatter.
Two batches of concrete cylinders were made with and without a calcium chloride (CaCl2) accelerator admixture. Six cylinders were made of each batch and submerged in water for different times before testing for compressive strength and the results are shown in Table P6.34. It is required to do the following: a. Using an Excel sheet, plot the relationship between curing time and compressive strength of the two mixes on the same graph. Label all axes and curves. b. Comment on the effect of the accelerator on the compressive strength of PCC at early and late ages. TABLE P6.34 Cylinder no. 1 2 3 4 5 6 Water submergence (days) Compressive strength of plain concrete (MPa) Compressive strength of concrete with accelerator (MPa) 1 3 7 14 21 28 0.8 7.8 15.8 21.1 24.5 26.8 6.2 14.8 20.1 24.0 25.9 26.8