Very-early strength latex-modified concrete (VES-LMC) was developed for the purpose of fast-track overlay of a concrete bridge deck under heavy traffic, concentrated on the workability and strength gain so that it can be opened to the traffic only three hours after its placement. The mixture ofVES-LMC might accompany very high heat of hydration at early-age because of its inherent rapid hardening property and could have susceptibility to autogenous shrinkage because of its relative low water-cement ratio. This study evaluated the effect of the polymer-cement ratio both of the constant and variable slumps on the temperature rise with heat of hydration and early-age shrinkages of VES-LMC by carrying out simple temperature rise test and early-age shrinkage experiment. The results are as follows: The overall trends of temperature rise with heat of hydration were similar regardless of polymer-cement ratios within this study, although the initial setting by the polymer-cement ratio varied a little. This result affirms that latex contributes on the enhancement of the concrete durability but has little effect on its hydration and the accompanied heat of hydration in very-early strength latex-modified concrete. Autogenous shrinkage increased with the increase in polymer-cement ratio and its pattern followed regularly a logarithmic increase. However, the influence of water-cement ratio and polymer-cement ratios for the test specimens at constant slump on early-ageautogenous shrinkage property was found to be rather very little due to the simultaneous effect of the two experimental variables.
Samenvatting