中文摘要：

改善碳纤维增强水泥（CFRC）的压敏性有助于提高其感知应力应变的能力。采用两电极法研究了磁选粉煤灰部分取代水泥对CFRC压敏性的影响,分析了磁选粉煤灰掺量、铁氧化物含量等因素影响CFRC压敏性的规律及机理。结果表明,碳纤维质量掺量≤0.8%时,用铁氧化物含量达到30%的磁选粉煤灰取代20%～30%的水泥来制备CFRC时可以显著改善CFRC的压敏性;碳纤维质量掺量为1.2%时,掺加磁选粉煤灰不利于提高CFRC的压敏性;磁选粉煤灰对采用最大长度为3和5mm的碳纤维制备的CFRC的压敏性具有显著改善效果。掺加适量磁选粉煤灰使CFRC在碳纤维掺量较低时仍然可以获得良好压敏性,并显著降低CFRC的制备成本。

英文摘要：

Improving the compression sensitivity of carbon fiber reinforced cement（CFRC） was help to promote its capacity in perceiving stress and strain.In this paper,the effect of magnetic separation fly ash（MSFA） on compression sensitivity of CFRC was investigated by two electrode methods.Factors affecting the compression sensitivity of CFRC,such as MSFA content,iron oxide content,were analyzed.Results showed that replacing 20% to 30% amount of cement with MSFA would promote the compression sensitivity of CFRC significantly when the quality dosage of carbon fiber is not greater than 0.8%.MSFA was not conducive to improve the compression sensitivity of CFRC when the quality dosage of carbon fiber was 1.2%.MSFA has prominent effect on the compression sensitivity of CFRC when the maximum length of carbon fiber was 3 and 5mm.When the content of carbon fiber was low,the application of appropriate amount of MSFA in CFRC not only provided excellent compression sensitivity,but also reduced the cost of CFRC.