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Assessment of the hydration constants of post blended blast furnace slag cements

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Author: Visser, J.H.M. · Zon, Q.F. van · Beijersbergen van Henegouwen, J.F. · Hacquebord, A. · Zwet, R.G.A. van
Type:article
Date:2014
Source:XIII International Conference on Durability of Building Materials and Components, 113-120
Identifier: 516023
Keywords: Materials · Buildings and Infrastructure · Built Environment · Building Engineering & Civil Engineering · SR - Structural Reliability · TS - Technical Sciences

Abstract

The amount of bound water in OPC i slag blends have been measured for three different temperature regimes: from 105 to 950°C, 400 to 600 oC and 600 to 950°C for three different OPCs and one type of slag, at 5 different replacement factor and at four ages. Based on the measured linear relationship between the amount of bound water with slag replacement, the effect of the replacement could be eliminated and the effect of the OPC and slag effect on the water contents could be separated. Time effects were next eliminated by modelling the results with help of an hydration model on the basis of the observed exponential increase in water contents with time. The resulting hydration constants were obtained for the total nonevaporable water content showing different values from 0.19 to 0.22 for the three different OPCs correlating well with other data form literature. A constant value of 0.06 was found for the slag. For the bound water in the calcium hydroxide, constants were approximately 0.07 for the OPC cements and 0.02 for the slag. For the Type I CSH or meta-jennite the constant was 0.06 to 0.1 for the OCPs and zero for the slag