Compressive Strength of Rubberized Concrete with Cement Paste Wrapping Rubber Aggregate

Abstract

It is investigated that compressive strength of rubberized concrete with cement paste wrapping rubber aggregate is improved by compressive strength test. And interfacial transition zone of concrete is characterized by scanning electron microscope (SEM), Energy Dispersive X-ray Analysis (EDXA) and micro hardness. The results showed that compressive strength of rubberized concrete with cement paste wrapping rubber aggregate was better than that of reference concrete with increasing of rubber at 7d and 28d respectively. Furthermore, when rubber was 30 kg/m3 in concrete, compressive strength of rubberized concrete 7d and 28d was as 141% and 136% as of that of concrete with popular casting. There were better structure, lower content of Ca(OH)2, smaller scope by 25mm and higher 8.9MPa of micro hardness in interfacial transition zone of rubberized concrete than in that of concrete with popular casting. Compressive strength of concrete with cement paste wrapping rubber aggregate is high because of its good interfacial transition zone.