Building Materials, Third Edition

RRP f  2w—— g— ™—  f—22ƒ ™X Bitumens are classed as natural and petroleum bitumens. x— —2f X P ...

„—D2f 2— 2e— RRQ ‚™ Bitumen is resilient, non-rigid and as such it is capable of absorbing shocks and acc ...

RRR f  2w—— „——™ is ironstone slag impregnated with tar oils. It is impervious to water and used in road pavement ...

„—D2f 2— 2e— RRS x— —2e!— is also known as native asphalt. When obtained from lakes it is termed as lake a ...

RRT f  2w—— S( e  !2 h 222 — 22 2  q — 2—™ 2  2—2 2—2™—  2—    ™ 22 ...

„—D2f 2— 2e— RRU material used. Experience indicates that bitumen is likely to be more durable in this respect th ...

RRV f  2w—— roofs. They should therefore always be laid on an isolating membrane such as sheathing felt. On the oth ...

„—D2f 2— 2e— RRW is kept touching the surface of the bitumen with the dial set zero and the initial reading is re ...

RSH f  2w—— temperature, for each ring and ball is recorded at the instant the binder surrounding the ball touches ...

„—D2f 2— 2e— RSI The tar cup is leveled with the help of a bubble level. The cup is immersed in the water bath cu ...

RSP f  2w—— ‡—2g2„Foaming occurs when water is in excess of the specified amount. In this test water-fr ...

„—D2f 2— 2e— RSQ The average distance (of two normal tests) in centimeters through which the pointer has travelle ...

RSR f  2w—— f——™2w! Specifice gravity = a a – b where a = weight of the dry specimen b = weight of the speci ...

„—D2f 2— 2e— RSS f2  (bitumen 5%, emulsifier content 0.01 to 5%) are used for making water and steam ...

RST f  2w—— ‡—/2  are manufactured by imprgnating artifical or natural porous materials (brick, concr ...

„—D2f 2— 2e— RSU Petroleum bitumen is obtained from (a) fractional distillation (b) extraction (c) atmospheric-v ...

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q RSW wall plaster stucco, and hard finish plaster are extensively used in wall construction. Flooring plaster, made by cal ...

RTH f 2w——  Gypsum sets within 20 minutes and it is difficult to use it for some purpose. Suitable setting retarders ...

q RTI r2f  2†—  Anyhydrite cement is obtained by burning natural dihydrate gypsum at a temperature of about ...