If fc(28)-27.5 Mpa, then the fc(180)=--- -------for concrete produced using *type IIlI cement and cured in moist Type of Cement III Type- cement (High early Type-cement (ordinary Factor strength Portland cement) Portland cement) moist-cured steam-cured moist-cured steam-cured 4.00 2.30 1.00 0.70 0.857 0.92 0.95 0.98 29 Mра О 27.9 Mpa 28.8 Mpa O

If fc(28)-27.5 Mpa, then the fc(180)=--- -------for concrete produced using *type IIlI cement and cured in moist Type of Cement III Type- cement (High early Type-cement (ordinary Factor strength Portland cement) Portland cement) moist-cured steam-cured moist-cured steam-cured 4.00 2.30 1.00 0.70 0.857 0.92 0.95 0.98 29 Mра О 27.9 Mpa 28.8 Mpa O

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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The strength of concrete primarily depends on the:Type of aggregatesWater-cement ratioCuring timeMixing method
Students in the materials class prepared three mortar míxes with water to cement ratios of 0.50, 0.55, and 0.60. Three 50-mm mortar cubes were pre- pared for each mix. The cubes were cured for 7 days and then tested for com- pressive strength. The test results were as shown in Table P6.16. ТАBLE P6.16 Mix w/c Мaximum Compressive Average Compressive Strength (MPa) No. Ratio Cube No. Load (kN) Strength (MPa) 1 79.4 1 0.50 80.1 81.9 1. 74.7 2 0.55 2 74.5 3 72.5 1. 65.8 2 69.3 3 0.60 71.2 Determine the following: a. The compressive strength of each cube. b. The average compressive strength for each mix. c. Plot the average compressive strength versus w/c ratios for all mixes. d. Comment on the effect of increasing w/c ratio on the compressive strength of the cubes.
Which of the following material is/are used as an accelerator’s additive for cement? a. Sodium Chloride b. Caustic Soda c. Calcium Chloride d. Nitrogen e. Barite f. Bentonite g. Gypsum
Design a concrete mix for use in reinforced cement concrete work from the following data : ) Characteristic strength at 28-days = 25 N/mm2 (i) Type of cement = 43 grade ordinary Portland cement fi) Slump required = 30-60 mm; exposure = moderate %3D iv) 20 mm and 40 mm maximum size rounded gravel aggregate available (v) Natural sand is available as fine aggregate (vi) Specific gravity of coarse aggregate = 2.7 betpen AW (vii) Specific gravity of fine aggregate = 2.65 (Vim) The fine aggregate corresponds to grading zone II (Table 1.9).
On most rigs cement materials are handled in bulk, which makes blending and mixing much easier. a. True b. False
1. Select the most appropriate answer Chemical reaction between water and cement in which cement takes up water and form a gel which hardens as concrete. o Ponding o Hydration o Cement paste o Workability The type of cement that is used for normal usage. Suitable for floors, reinforced concrete structures, pavements, etc. о Туре I о Туре II о Туре III о Туре IV о Туре V Settling of solid in fresh concrete leaving water on surface o Segregation o Ponding o Curing o Bleeding For which of the following a higher slump is typically specified? o Large foundations o Column Pavements
Use ACI method .
Q- A sample of concrete is prepared by using 500 g of cement with water cement ratio of 0.55 and 240 N/mm² intrinsic strength of gel. The theoretical strength of concrete on full hydration will be nearly
Which of the options are correct for a 3m³ of concrete having design mix proportion of 1:2:7 (by volume) A Volume of cement required = 0.318 m³ B No. of cement bags required = 15 C D Volume of coarse aggregate = 2.5 m³ Volume of water required = 1m³
In the solution with the same concentration, strength loss of the hardened cement paste soaked in magnesium sulfate solution was less than that in sodium sulfate solution. why?