关键词: 粉煤灰;ECC;纤维长度;力学性能

Abstract: In order to study the effect of high volume fly ash on the mechanical properties of PVA-ECC and analyze the mechanism of fly ash in ECC,four-point bending test and compressive strength test were carried out. The replacement ratio of cement with fly ash was 40%,50% and 60%,respectively. The experimental results indicate that with the increase of fly ash content,the compressive strength of ECC decreases,the initial crack load and peak load of ECC specimen in four point bending test decrease,the mid span deflection increases and the crack width decreases. Under the condition of high volume fly ash, the fiber length has a great influence on the compressive strength and ductility of ECC,and the 12 mm fiber can ensure the strength and obtain high ductility and toughness at the same time.

Key words: fly ash;ECC;fiber length;mechanical property