Optimization Design and Properties of Glass Fiber Reinforced Cementitious Composites
ZHANG Wangtian1,2, ZHANG Yunsheng1,2, WU Zhitao1,2, LIU Naidong1,2, YUAN Difei3
1 School of Materials Science and Engineering, Southeast University, Nanjing 211189; 2 Key Laboratory for Civil Engineering Material of Jiangsu, Nanjing 211189; 3 Guodian Nanjing Automation Co., LTD, Nangjing 211153
Abstract: To obtain the high performance and good durability glass fiber reinforced cementitious composites (GRC), multi factor experimental design method (include: water-binder ratio, binder-sand ratio, content of glass fiber and supplementary cementitious materials) was used in this study to prepare a novel type of GRC based on long-term performance. The development of mechanical properties of GRC was evaluated, meanwhile, the hydration products and micro-structure of GRC was investigated by scanning electronic microscope (SEM) and X-ray powder diffraction (XRD). Test results showed that the optimal parameter of GRC prepared contained: water-binder ratio was 0.30—0.38; binder-sand ratio was 1∶0.5—1∶2; glass fiber content was 2% (volume content). The flexural strength of GRC prepared by plain Portland cement obviously declined after curing 28 d. However, the flexural strength of GRC which used the fly ash or silica fume as supplementary cementitious materials to replace part of Portland cement was improved at a long-term hydration process, because the fly ash and silica fume could be reacted with Ca(OH)2 and effectively reduced the alkalinity of hydrated paste during the hydration process. Thus, the long-term flexural strength of GRC was stable by using fly ash or silica fume to prepare GRC.
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2019, Vol. 33 
