Test 16 - Portland Pozzolana and Portland Slag Cement

Question 1 ప్రశ్న 1

Which combination correctly matches the current Indian Standards with the respective cement types?

A IS 1489 (Part 1):2015 – Fly ash based PPC; IS 1489 (Part 2):2015 – Calcined clay based PPC; IS 455:2015 – Portland Slag Cement B IS 455:2015 – Fly ash based PPC; IS 269:2015 – Portland Slag Cement; IS 1489 (Part 1):2015 – OPC 53 C IS 1489 (Part 2):2015 – Portland Slag Cement; IS 455:2015 – Calcined clay based PPC; IS 269:2015 – Fly ash based PPC D IS 8112 – All types of PPC and PSC; IS 455 – OPC only; IS 269 – Calcined clay only

Question 2 ప్రశ్న 2

Under IS 1489 (Part 1):2015, what is the permitted fly ash content by mass of fly ash based Portland Pozzolana Cement?

A 5 to 15 percent B 10 to 25 percent C 15 to 35 percent D 25 to 70 percent

Question 3 ప్రశ్న 3

Under IS 1489 (Part 2):2015, the total pozzolana constituent in calcined clay based PPC shall be:

A Not less than 10 percent and not more than 25 percent by mass B Not less than 15 percent and not more than 35 percent by mass C Not less than 25 percent and not more than 70 percent by mass D Exactly 50 percent by mass

Question 4 ప్రశ్న 4

What is the permitted range of granulated slag content in Portland Slag Cement under IS 455:2015?

A 5 to 15 percent B 10 to 25 percent C 15 to 35 percent D 25 to 70 percent

Question 5 ప్రశ్న 5

Which statement correctly describes the permitted general manufacturing approaches for PPC and PSC?

A They can be produced only by separately packing OPC and the supplementary constituent. B They may be produced by appropriate intergrinding or by intimate and uniform blending of the specified constituents, subject to compliance with the relevant standard. C They must always be manufactured by mixing hardened concrete with cement clinker. D PSC must be manufactured only by hand mixing, whereas PPC must be manufactured only by wet grinding.

Question 6 ప్రశ్న 6

Which statement best describes the pozzolanic reaction that contributes to the performance of PPC?

A The pozzolana reacts with calcium hydroxide in the presence of water to form additional cementitious hydration products. B Fly ash prevents Portland cement clinker from hydrating. C Pozzolana reacts only with coarse aggregate and not with hydration products. D The pozzolanic reaction consists solely of evaporation of mixing water.

Question 7 ప్రశ్న 7

Which statement most appropriately describes the role of granulated blast-furnace slag in Portland Slag Cement?

A It behaves only as an inert colouring material. B It possesses latent hydraulic characteristics and can contribute to cementitious hydration in the alkaline cement system. C It prevents all hydration of the Portland cement fraction. D Its only purpose is to increase the density of the cement bag.

Question 8 ప్రశ్న 8

Compared with a suitably chosen OPC having rapid early strength development, what is generally true of PPC when high early-age strength is the overriding requirement?

A PPC always develops higher one-day strength irrespective of composition and curing. B PPC may develop strength more gradually, so cement selection should specifically consider the required early-age strength rather than assuming PPC is automatically preferable. C PPC cannot develop significant strength after 28 days. D PPC is prohibited in structural concrete.

Question 9 ప్రశ్న 9

Why are PPC and PSC often considered for mass-concrete construction such as large foundations or dam components?

A They always generate zero heat during hydration. B They can provide a more gradual heat-development profile than some OPC systems, which may help in controlling thermal effects when properly designed. C They eliminate the need for temperature-control measures in every mass pour. D Their sole purpose is to increase the concrete temperature as rapidly as possible.

Question 10 ప్రశ్న 10

Portland Slag Cement is being considered for a marine substructure exposed to chlorides and sulphates. Which statement is most appropriate?

A PSC is commonly suitable for such exposure because properly proportioned and cured slag-containing concrete can provide favourable resistance to chloride and sulphate ingress, but complete durability design is still required. B PSC makes concrete completely impermeable under all conditions. C PSC eliminates the need for cover to reinforcement. D PSC guarantees immunity from corrosion even when the concrete is cracked and poorly cured.

Question 11 ప్రశ్న 11

Which statement correctly compares the minimum Blaine fineness requirements of PPC and PSC under their current Indian Standards?

A Both require a minimum of 225 m²/kg. B PPC requires at least 300 m²/kg, whereas PSC requires at least 225 m²/kg. C PPC requires at least 225 m²/kg, whereas PSC requires at least 370 m²/kg. D Neither PPC nor PSC has a specified fineness requirement.

Question 12 ప్రశ్న 12

Which pair correctly states the setting-time requirements common to PPC under IS 1489 and PSC under IS 455?

A Initial setting time at least 30 minutes and final setting time not more than 600 minutes B Initial setting time at least 10 minutes and final setting time not more than 60 minutes C Initial setting time at least 120 minutes and final setting time not more than 300 minutes D Both initial and final setting times must be exactly 600 minutes

Question 13 ప్రశ్న 13

What are the normal maximum soundness values specified for both PPC and PSC by the Le Chatelier and autoclave methods respectively?

A 5 mm and 0.2 percent B 10 mm and 0.8 percent C 20 mm and 1.5 percent D 25 mm and 2.0 percent

Question 14 ప్రశ్న 14

Which set gives the minimum standard-mortar compressive strengths specified for both PPC and PSC at approximately 3, 7 and 28 days?

A 10, 16 and 22 MPa B 16, 22 and 33 MPa C 23, 33 and 43 MPa D 27, 37 and 53 MPa

Question 15 ప్రశ్న 15

A fly ash based PPC sample develops standard-mortar compressive strengths of 17 MPa at 3 days, 21 MPa at 7 days and 36 MPa at 28 days. Considering only the specified compressive-strength requirements, what is the correct assessment?

A It complies because its 28-day strength exceeds 33 MPa. B It fails because the 7-day strength is below the required minimum. C It automatically becomes OPC 43. D It complies because the average of the three strengths exceeds 22 MPa.

Question 16 ప్రశ్న 16

A Portland Slag Cement sample develops 18 MPa, 24 MPa and 35 MPa at approximately 3, 7 and 28 days respectively. Assuming all other requirements are satisfied, which conclusion is correct?

A It satisfies the specified minimum compressive-strength requirements of IS 455. B It fails because PSC must reach 53 MPa at 28 days. C It fails because its 3-day strength must exceed 23 MPa. D It can comply only if its slag content is zero.

Question 17 ప్రశ్న 17

A 1000 kg batch of fly ash based PPC contains 250 kg of fly ash. Considering only the fly ash proportion requirement of IS 1489 (Part 1):2015, what is the correct assessment?

A It complies because the fly ash content is 25 percent. B It fails because fly ash must be below 15 percent. C It fails because fly ash must exceed 35 percent. D It can comply only when fly ash is exactly 20 percent.

Question 18 ప్రశ్న 18

A 1000 kg batch proposed as calcined clay based PPC contains a total pozzolana constituent of 300 kg. Considering only the composition requirement of IS 1489 (Part 2):2015, what is the correct conclusion?

A It complies because 30 percent lies within the required range. B It does not comply because 30 percent exceeds the specified maximum total pozzolana content. C It complies only because all PPC must contain exactly 30 percent pozzolana. D It automatically qualifies as PSC.

Question 19 ప్రశ్న 19

A 1000 kg batch of Portland Slag Cement contains 680 kg of granulated slag. Considering only the slag-content requirement of IS 455:2015, what is the correct assessment?

A It fails because slag must not exceed 35 percent. B It complies because the slag content is 68 percent. C It fails because PSC must contain exactly 50 percent slag. D It automatically becomes supersulphated cement.

Question 20 ప్రశ్న 20

Match the constituent with the relevant Indian Standard used in the current PPC or PSC framework:
1. Fly ash for PPC
2. Calcined clay pozzolana
3. Portland cement clinker
4. Ground granulated blast-furnace slag for blending with Portland cement

P. IS 16353
Q. IS 3812 (Part 1)
R. IS 1344
S. IS 16714

A 1-Q, 2-R, 3-P, 4-S B 1-R, 2-Q, 3-S, 4-P C 1-P, 2-S, 3-R, 4-Q D 1-S, 2-P, 3-Q, 4-R

Question 21 ప్రశ్న 21

A precast operation requires very rapid strength gain for early demoulding and short production cycles. Which statement about choosing PPC solely because it is a blended cement is most appropriate?

A PPC must always be selected because all PPC develops strength faster than every OPC. B PPC should not be selected solely from its cement type; the actual early-strength requirement and verified cement or concrete performance must govern the choice. C PPC cannot be used in any precast work under any circumstances. D Early-age strength is unrelated to cement selection.

Question 22 ప్రశ్న 22

Why is adequate curing particularly important when concrete containing PPC or PSC is intended to obtain durability benefits from the supplementary cementitious constituent?

A Continued moisture permits hydration and pozzolanic or slag-related reactions to progress and helps develop a denser cementitious microstructure. B Curing prevents all chemical reactions in the cement. C PPC and PSC develop their full properties even when deliberately dried immediately after placement. D Curing changes fly ash into coarse aggregate.

Question 23 ప్రశ్న 23

Which statement concerning permeability and durability of properly proportioned PPC or PSC concrete is most technically defensible?

A PPC and PSC automatically make concrete impermeable regardless of water-cement ratio and compaction. B Continued pozzolanic or slag reactions can refine pore structure and reduce transport of aggressive agents, but performance still depends strongly on mix design, curing, cracking and exposure. C Their durability depends only on the colour of the cement powder. D The presence of fly ash or slag eliminates the need for adequate concrete cover.

Question 24 ప్రశ్న 24

Which statement best reflects the use of PSC in chloride- and sulphate-bearing environments?

A PSC is commonly selected for marine, harbour, sewage and similar works because suitable slag-containing concrete can provide favourable resistance, but exposure-specific design requirements still apply. B PSC is prohibited in marine construction. C PSC makes reinforcement corrosion impossible even if chlorides directly reach the steel. D PSC should be selected solely by slag percentage without considering concrete quality.

Question 25 ప్రశ్న 25

A major foundation has a large concrete volume, prolonged moist curing can be provided, very early strength is not critical, and reduction of thermal and permeability-related durability risks is desirable. Which decision is most appropriate?

A Reject both PPC and PSC because only OPC can be used structurally. B Consider a compliant PPC or PSC as a suitable option, then select between them using the actual exposure, heat-development requirement, strength development, constituent quality and project specification. C Select PPC automatically in every case because it is universally superior to PSC. D Select PSC automatically in every case because slag percentage alone determines concrete durability.

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