Determine whether the following sentences are TRUE or FALSE: a) Sulfate-resistan

Question

Determine whether the following sentences are TRUE or FALSE: a) Sulfate-resistant (Type V) cement is manufactured with slightly increased content of C3A. ) b) The strength development of portland cement based concrete is due to hydration and 1) formation of dense C-S-H structure.) Loss of moisture from concrete during curing increases the strength of concrete in 28-day age due to densification of structure. ) c) d) Aging improves the ductility of asphalt cement.) e) Asphalt concrete can be placed and consolidated only at elevated temperatures. )

Explanation / Answer

1.a)False. Since the reactions of sulfates are prominently with calcium aluminates therefore sulfate attack is countered by reducing C3A content

b) True

c)False. Moist curing enhanced increase of strength.So loss of moisture during curing of concrete is not good for strength gain.

d) False. Asphalt cement stiffens and oxidizes with age.

e) True. It gives more time to place and compact properly

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