Significance of porosity measurements on blended cement performance

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Proceedings titleACI SP
ConferenceFly Ash, Silica Fume, Slag and other Mineral By-Products in Concrete : Proceedings of the 1st CANMET/ACI International Conference: 31 July 1983, Montebello, Que, Canada
Pages415433; # of pages: 19
Subjectporosity; hydrated cement; properties of materials; blended cements; calcium hydroxides; compressive strength; density; durability; fly ash; modulus of elasticity; quartz; slags; temperature; Concrete
AbstractNormal portland cement mixed separately with two types of fly-ash and ground quartz to produce blends containing 35 per cent additive and a mix containing 70 per cent slag were cured in water at 21, 35 and 55 degrees C at a w/c = 0.45. After 2, 7, 14, 28, 90, 180, 365, and 550 days, Ca(OH)[2] content, pore size distribution, compressive strength, Young' s modulus and microhardness of the products were determined. Density and porosity were measured by mercury intrusion, helium pycnometry and methanol saturation. Mortars were also prepared using these blends. After curing for 15 or 240 days they were exposed to a salt solution containing 27.5% CaCl[2], 3.9% MgCl[2], 1.8% NaCl and 0.1% NaHCO[3]. The porosities of the hydrated blends were higher when measured by mercury intrusion and had a higher percentage of fine pores. Densities of the products calculated from these pore measurements gave more realistic values. Higher temperatures increased the early rate of reaction of the cement, then retarded it, but the acceleration period was extended for the cement blends. Factors responsible for durability were found to be pore volume above 88 nm diam and Ca(OH)[2] content.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedYes
NRC number23494
NPARC number20375283
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Record identifier1155ab96-834f-4e84-87c3-c47d8521885c
Record created2012-07-23
Record modified2016-05-09
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