INFLUENCE OF MIXTURE COMPOSITION ON SHRINKAGE CRACKING OF LIGHTWEIGHT SELF-CONSOLIDATING CONCRETE

This paper presents a part of the results from a broader study dealing properties of lightweight self-consolidating concrete. Various self-consolidating mixtures were considered by replacing a part of fine and coarse aggregate with light-weight aggregate. The workability of SCC was evaluated using the slump flow test, V-funnel test and J-ring test. For verification of concrete segregation the concrete specimens were cutting and a visual evaluated of the distribution of coarse aggregates. Free shrinkage of concrete has been investigated using beam specimens 50x50x250mm on Graf-Kaufman test. Restrained shrinkage cracking performance was tested using ring specimens (ASTM C1581), which had an inner steel ring instrumented with an electrical strain gauge to monitor stress rise in the concrete due to drying shrinkage under restrained conditions.