针对后张法预应力混凝土孔道灌浆中容易出现的质量问题及新桥规的具体要求,提出掺加粉煤灰改善浆体的技术性能.研究了粉煤灰对浆体流动性、稳定性、耐久性和强度发展的影响.经过试验,得出结论:粉煤灰在一定掺量范围内可以改善浆体的流动性、稳定性和耐久性,掺量在30％以内早期强度可以满足规范要求.%In this paper, the performance of grouting materials is improved by fly ash and polycarboxylate superplasficizer according to the new bridge specification and in the light of common faults which appear frequently in prestressed concrete with post-tensioning method. The fluidity, stability, durability and strength of grout are studied.
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