Building Materials, Third Edition
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- Ordinary Portland cement should have surface area not less than (in mm^2 /g x 10^2 )
(a) 2250 (b) 3000 (c) 3250 (d) 4000
- To produce low heat cements, it is necessary to reduct the compound
(a) C 3 S (b) C 2 S (c) C 3 A (d) C 4 AF
- For complete hydration of cement the w/c ratio needed is
(a) less than 0.25
(b) more than 0.25 but less than 0.35
(c) more than 0.35 but less than 0.45
(b) more than 0.45 but less than 0.60
- High alumina cement is produced by fusing together a mixture of
(a) limestone and bauxite
(b) limestone, bauxite and gypsum
(c) limestone, gypsum and clay
(d) limestone, gypsum, bauxite, clay and chalk
- Consider the following statements:
High early strength of cement is obtained as a result of
- fine grinding
- decreasing the lime content
- burning at higher temperatures
- increasing the quantity of gypsum
Of these statements
(a) 1 and 2 are correct (b) 1 and 3 are correct
(c) 2, 3 and 4 are correct (d) 1, 3 and 4 are correct
- Four main oxides present in ordinary Portland cement are: CaO, A1 2 O 3 , SiO 2 and Fe 2 O 3.
Identify the correct ascending order of their proportions in a typical composition of OPC
(a) Al 2 O 3 , Fe 2 O 3 , CaO, SiO 2 (b) A1 2 O 3 , CaO, Fe 2 O 3 , SiO 2
(c) Fe 2 O 3 , Al 2 O 3 , SiO 2 , CaO (d) Fe 2 O 3 , SiO 2 , Al 2 O 3 , CaO
- Match List-I with List-II and select the correct answer using the codes given below the
lists:
List-I List-II
(Type of cement)(Characteristics)
A. Air entraining Portland cement 1. Suitable for very large structures
B. Low heat Portland cement 2. Unsuitable for very large masses of
concrete
C. Hydrophobic Portland cement 3. Greater resistance to frost attack
D. Rapid hardening Portland cement 4. Safe storage under unfavourable
conditions of humidity
Codes:
(a)AB CD (b)AB CD
4213 3412
(c)AB CD (d)AB CD
3142 4123
