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高韌性纖維增強水泥基復合材料的收縮變形

Shrinkage distortion of fiber-reinforced high-ductility cementitious composites

  • 摘要: 通過試驗研究了砂灰比、水灰比、纖維種類和減縮劑對高韌性纖維增強水泥基復合材料(ECC)收縮變形的影響.結果表明:隨著砂灰比的增大,ECC收縮應變值逐漸減小;隨著水灰比的增大,ECC收縮應變值逐漸增大;國產PVA纖維對控制ECC早期收縮變形有較明顯的效果,而日本產的高彈性模量PVA纖維對控制ECC后期收縮變形效果顯著;水灰比為0.40時,混雜纖維對控制ECC收縮變形的效用比單獨摻入國產PVA或日本產PVA好;水灰比為0.40時,摻入減縮劑可使ECC收縮應變約減少200×10-6,可見減縮劑控制ECC收縮變形效果顯著.

     

    Abstract: The effects of sand-to-cementitious materials ratio (S/C), water-to-cementitious materials ratio (W/C), fiber species and using a reduction additive on the shrinkage distortion of fiber-reinforced high-ductility cementitious composites (ECC) were investigated. Experimental results show that the shrinkage strain of ECC reduces with increasing S/C and enlarges with increasing W/C. Chinese PVA fibers effectively control the early stage shrinkage distortion of ECC, but Japanese PVA fibers of high Young's modulus have great effect on the final stage shrinkage distortion of ECC. Hybrid fibers can better control the shrinkage distortion of ECC than Chinese or Japanese PVA fibers separately when the W/C is 0.40. The shrinkage strain probably reduces 200×10-6 by using a reduction additive, and the reduction additive can also effectively control the shrinkage distortion of ECC at the W/C of 0.40.

     

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