基于性能的GRC材料配合比优化设计  

Optimum design of GRC proportion based on material performance

作　　者：冯竟竟[1] 阎培渝[1] 

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《新型建筑材料》2010年第7期1-3,10,共4页New Building Materials

基　　金：国家"十一五"科技支撑计划项目(2006BAJ05B04-05)

摘　　要：通过正交试验对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,掺加粉煤灰有助于提高拌合物的保水性且降低GRC材料成本,但掺量应控制在15%以内;粗砂比例的提高能显著提高GRC的抗折强度,但对拌合物工作性有不利影响,细砂与粗砂质量比宜为1∶1～1∶2;纤维体积掺量在1.5%～2.0%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中均匀分散,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。Optimum design of GRC proportion based on material performance was studied by orthogonal test. The influence of components 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 1：1-1：2. The flexural strength of GRC increases greatly with the increase of glass fiber content when the volume ratio of fiber is between 1.5%~2.0%. The large water-binder ratio is beneficial to the homogeneous dispersion of fiber in GRC mortar and its flexural strength, but harmful to its compressive strength. The suitable range of water-binder ratio is between 0.42-0.45.

关 键 词：玻璃纤维增强水泥 正交试验 配合比 性能 

分 类 号：TU528.581[建筑科学—建筑技术科学]