基于性能的GRC材料配合此优化设计.pdfVIP

学兔兔 新 建巍 全国中文核心期刊 基于性能的GRC材料配合此优化设计 冯竞竟，阎培渝 (清华大学 土木工程系，北京 100084) 摘要：通过l 交试验对GRC材料配合比优化及性能进行研究，探讨了各参数对GRC材料工作性及强度的影响规律。结果表 明，掺加粉煤荻有助于提高拌合物的保水件日_降低GRC材料成本，但掺量应控制存15％以内；粗砂比例的提高能显著提高GRC的 抗折强度，但对拌合物 作性有不利影响，细砂 7料砂质量比宜为1：1～1：2：纤维体积掺量在 1．5％～2．O％时，随纤维掺量增加，GRC 的抗折强度显著增大；水胶比增大便于纤维在水泥浆体巾均匀分散，有利于提高GRC的抗折强度，但损失抗压强度，水胶比的合适 范围为0．42～0．45。 关键词：玻璃纤维增强水泥；正交试验；配合比；性能 中图分类号：TU528．581 文献标识码：A 文章编号：1001—702X(2010)07—0001—03 Optimum design of GRC proportion based on material performance FENG Jinxing，YAN Peiyu (Department of Civil Engineering，Tsinghua University，Beijing 100084，China) Abstract：Optimum design of GRC proportion based on material performance was studied by orthogonal test．The influence of conlponents on workability and strength of GRC was discussed．The results show that the addition of fly ash can increase the water keeping ability of GRC mixture and decrease its cost，but the adding rate should be controlled within 15％．High proportion of coarse sand improves obviously the flexural strength of GRC but decreases its fluidity．The ratio of fine sand and coarse sand should be between 1：l-1：2．The flexural strength of GRC increases greatly with the increase of glass fiber content when the volume ratio of fiber is between 1．5％～2．O％．The large water—binder ratio is beneficial to the homogeneous dispersion of fiber in GRC molar and its flexural strength．but harmful to its compressive strength．The suitable range of water—binder ratio is between 0．42-0．45． Key words：glass fiber reinforced cement：orthogonal test：proportion：performance