水泥基复合材料的抗压强度微波无损检测研究

Microwave noninvasive prediction of compressive strength of engineered cementitious composite

水泥基复合材料(ECC)作为当下最有科技代表性的胶凝材料,可将微波近场无损检测技术应用于其抗压强度的预测.分别对水胶比为0.20、0.255、0.30的ECC试件进行了微波无损试验和机械破坏试验,研究结果表明:水泥基复合材料凝结硬化后的抗压强度与浇筑后第1天所测得的微波属性具有强相关性.通过试验数据分析,获得了抗压强度和微波电导之间的线性反比关系;并确定了R-带宽下的微波电导下限.

This paper presents the results of a cross-disciplinary research project work, wherein microwave near-field noninvasive technique is employed for the prediction of com-pressive strength of the state-of-the-art cementitious material known as engineered cementi-tious composite （ECC）. It mixes and casts specimens with water- to-binder ratios of 0. 20,0. 255 and 0. 30 for the microwave test and mechanical destructive test. Experiment results demonstrate that the compressive strength of ECC at the mature age can be determined by u-sing microwave property of ECC measured on the first day when being cast. The inverse lin-ear relations between compressive strength and microwave conductance are obtained. The lower bound of microwave conductance in R-band is also established.