Maintainer of the workability of pumped concrete adde with sucrose

Abstract

Problems due to loss of workability waiting for mixers on site for pumping concrete, changes in emptying points, waiting for the transfer of personnel and original equipment, cracks, crabs, cold joints and low resistance of pumped concrete. There are investigations of sucrose in pastes and concrete, investigations of evaluation and measurement of pumping of concrete without and with chemical additives. The objective was to improve concrete with the use of sucrose as an additive for the manufacture of pumpable concrete. The research was experimental, designed in two groups: the control group: standard concrete “simple concrete” and experimental group “concrete with sucrose as an additive for pumping”. A simple concrete mixture f¨c=210 kg/cm2 and mixtures with white sucrose “Cartavio”, doses of 0.01 %, 0.07 %, 0.14 %, 0.20 %, 0.25 %, 0.28 %, 0.34 % and 0.40 % of the weight of the type I Andean Portland cement were made. Retention and settling were evaluated at time intervals of 10 minutes (10 min to 120 min); setting time and compressive strength 1, 3, 7, 28 and 60 days. The results with doses of 0.01 % and 0.20 %; caused the time taken to reach a settlement of 4”, minimum 21.74 % and máximum 204,351 %. The initial setting time; the minimum, with doses of 0.40 % (-16.47 %) and; maximum, with doses of 0.20 % (152.94 %). The final setting time; the minimum, with doses of 0.01 % (22.92 %) and; maximum, with doses of 0.40 % (154.67 %). The compressive strength at 28 days was the maximum with doses of 0.20 % (105 %) and; minimum, with doses of 0.40 % (30).