Effect of Clinoptilolite on Fresh and Early Strength Properties of Self-Compacting Concrete

The type of concrete called Self-compacting concrete (SCC) is well accepted nowadays by construction industries because of its flowability. In this study, the effect of natural zeolite (NZ) (Clinoptilolite) on the behaviour of self-compacting concrete was observed. Different percentages of NZ (5, 10 and 15%) by weight of cement were used in replacing cement. Water to powder (w/p) ratio was chosen 0.36, 0.38 and 0.4. Slump flow and V-funnel tests were used in investigating the concrete’s fresh properties; and the compressive strength was investigated at 3 and 7 days of curing. Results showed that the flowability decreases with an increasing amount of NZ. It was also observed that the specimens which had clinoptilolite had lower compressive strengths than that of the control specimens within the period of 3 days. However, after 7 days, strengths of SCC become closer to the strength of control specimens. It can be considered as a clear improvement in strength after 7 days for mixes containing NZ up to 10% compared to control mixes. Therefore, it can be said that NZ can be utilised up to 10% to replace cement in the production of SCC.