The cement whose strength is a little lower than the ordinary cement during the first three months but attains afterwards the same strength, is known as (A) Low-heat Portland cement (B) Rapid hardening Portland cement (C) Portland blast slag cement (D) Portland pozzolana cement

The cement whose strength is a little lower than the ordinary cement during the first three
months but attains afterwards the same strength, is known as
(A) Low-heat Portland cement
(B) Rapid hardening Portland cement
(C) Portland blast slag cement
(D) Portland pozzolana cement
by

1 Answer

Answer :

Answer: Option A
by

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Which of the following cements is suitable for use in massive concrete structures such as large dams? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

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Which of the following cements contains maximum percentage of dicalcium silicate? (A) Ordinary Portland cement (B) Low heat cement (C) Rapid hardening cement (D) Sulphate resisting cement

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Which of the following cements is expected to have the highest compressive strength after 3 days (a) Ordinary Portland cement (b) Rapid hardening cement (c) High alumina cement (d) Sulphate resisting cement.

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As compared to ordinary Portland cement, use of pozzolana cement (A) Reduces workability (B) Increases bleeding (C) Increases shrinkage (D) Increases strength

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When compared to ordinary Portland cement, Rapid hardening Portland cement contains ______________ amount of lime content [ A ] Equal [ B ] Greater [ C ] Lesser [ D ] Zero

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Addition of pozzolana to ordinary Portland cement increases (A) Bleeding (B) Shrinkage (C) Permeability (D) Heat of hydration

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Hardening of cement occurs at (A) Rapid rate during the first few days and afterwards it continues to increase at a decreased rate (B) Slow rate during the first few days and afterwards it continues to increase at a rapid rate (C) Uniform rate throughout its age (D) None of these

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Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay

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Portland pozzolana cement possesses (A) Higher resistance to chemical attack (B) Lower heat of hydration (C) Lower shrinkage on drying (D) All the above

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In Portland Blast furnace slag cement, the blast furnace slag content shall not exceed [ A ] 50% [ B ] 65% [ C ] 80% [ D ] 90%

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High percentage of tricalcium silicate and low percentage of dicalcium silicate in cement results in. (a) Rapid hardening (b) High early strength (c) High heat of generation (d) All the above

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Pick out the wrong statement. (A) Dry process is used for the manufacture of cement, when the raw material is blast furnace slag (B) Portland cement is made employing wet process (C) Gypsum is added to Portland cement to lengthen its setting time (D) None of these

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Addition of pozzolana to ordinary port land cement, causes (A) Decrease in early strength (B) Reduction in chemical action with sulphates (C) Increase in shrinkage (D) All the above

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According to IS specifications, the compressive strength of ordinary Portland cement after three days should not be less than (A) 7 MPa (B) 11.5 MPa (C) 16 MPa (D) 21 MPa

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Which of the following statements is correct? (a) Sulphate resisting cement is particularly used for canal lining. (b) Low heat cement should not be used for thin concrete structures. (c) Rapid hardening cement should not be used for massive concrete structures (d) All of the above

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The compressive strength an ordinary Portland cement (1:3) after 7 days test should not be less than. (a) 11N/mm2 (b) 17.5 N/mm2 (c) 22 N/mm2 (d) 27.5N/m2

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The high strength of rapid hardening cement at early stage, is due to its (A) Finer grinding (B) Burning at high temperature (C) Increased lime cement (D) Higher content of tricalcium

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Early attainment of strength in rapid hardening cement is mainly due to (A) Gypsum (B) Finer grinding (C) Tri-calcium silicate (D) Tri-calcium aluminate

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Rapid hardening cement is used (a) Where high early strength is desired (b) Where form work is to be removed as early as possible (c) For construction of road pavements. (d) All of the above

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As compared to ordinary Portland cement, high alumina cement has (A) Higher initial setting time but lower final setting time (B) Lower initial setting time but higher final setting time (C) Higher initial and final setting times (D) Lower initial and final setting times

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Minimum compressive strength of cement required at the age of 3 days for ordinary Portland cement of grade 33 is [ A ] 1.15 N/mm2 [ B ] 11.5 N/mm2 [ C ] 2.10 N/mm2 [ D ] 21 N/mm2

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Addition of pozzolana to cement (A) Decreases workability (B) Increases strength (C) Increases heat of hydration (D) None of these

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Which type of following cement is used for mass concrete work a) High Alumina cement b) Quick setting cement c) Rapid hardening cement d) Low heat cement*

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Pick up the correct statement from the following: (A) High percentage of C3S and low percentage of C2S cause rapid hardening (B) High percentage of C3S and low percentage of C2S make the cement less resistive to chemical attack (C) Low percentage of C3S and high percentage of C2S contribute to slow hardening (D) All the above

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Blast furnace slag cement concrete requires ___________time for shuttering and curing. (a) Less (b) More (c) Medium (d) All the above

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The addition of gypsum to portland cement helps in : (1) increasing the strength of cement (2) rapid setting of cement (3) preventing rapid setting of cement (4) reduction in the cost of cement

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An ordinary Portland cement when tested for its fineness, should not leave any residue on I.S. sieve No. 9, more than (A) 5 % (B) 10 % (C) 15 % (D) 20 %

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Last Answer : (B) 10 %

For an ordinary Portland cement (A) Residual does not exceed 10% when sieved through IS Sieve No. 9 (B) Soundness varies from 5 to 10 mm (C) Initial setting time is not less than 30 minutes (D) Compressive stress after 7 days, is not less than 175 kg/cm2

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The initial setting time for ordinary Portland cement as per IS specifications should not be less than (A) 10 minutes (B) 30 minutes (C) 60 minutes (D) 600 minutes

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According to IS Code , the requirement of an ordinary Portland cement is (a) The residue does not exceed 10% when sieved through is sieve no .9 (b) Its initial setting time is not less than 30 minutes. (c) its expansion is not morethan 10mm for unaerated cement (d) All the above.

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Last Answer : (d) All the above.

Rapid hardening cement contains (A) Tri-calcium silicate (B) Tri-calcium aluminate (C) Tetra-calcium alumino-ferrite (D) Di-calcium silicate

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The normal consistency of ordinary Portland cement is about (A) 10 % (B) 20 % (C) 30 % (D) 40 %

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Last Answer : Answer: Option C

As per IS specifications, the maximum final setting time for ordinary Portland cement should be (A) 30 minutes (B) 1 hour (C) 6 hours (D) 10 hour

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For Ordinary Portland cement concrete exposed to dry and hot weather conditions, good moist curing period is [ A ] 7 days [ B ] 10 days [ C ] 14 days [ D ] None of the above

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Last Answer : [ B ] 10 days

Chief constituent of ordinary Portland cement is [ A ] Lime [ B ] Alumina [ C ] Magnesia [ D ] Iron oxide

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Last Answer : [ A ] Lime

Ordinary Portland cement requires a specific surface of [ A ] 1250 cm2/gm [ B ] 2250 cm 2/gm [ C ] 3250 cm 2/gm [ D ] 3500 cm 2/gm

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Last Answer : [ B ] 2250 cm 2/gm

Addition of pozzolana to cement causes (A) Reduction in permeability (B) Loss of heat of hydration (C) Reduction in bleeding (D) All the above

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Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) Water cement paste hardens due to hydration (B) During hardening cement binds the aggregates together (C) Cement provides strength, durability and water tightness to the concrete (D) All the above

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Last Answer : Answer: Option D