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The main thrust of this research was to determine the effectiveness of polyvinyl alcohol (PVA) powder in enhancing the durability of short GFRC materials. Accelerated aging of the materials was achieved through low-pressure steam curing in a moist chamber. The strength and ductility of GFRC were measured by the direct tension test, which showed that incorporation of PVA powder into GFRC could improve its mechanical behaviour and turn it from brittle to ductile. To investigate the mechanism of the tensile strength enhancement, the fiber-matrix interface was examined by polarizing optical microscopy and scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDAX). It was found that PVA powder tended to migrate to the fiber-matrix interfacial zone and thus prevented the accumulation of calcium hydroxide in this area. PVA film around the fiber resulted in a more ductile interfacial microstructure and better bonding between fiber and matrix, which should be responsible for enhancing the tensile property and preventing the aging of GFRC. Furthermore, PVA powder reduced the microhardness and brittleness at the interface. 相似文献
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EPS模块建筑在北方寒冷与严寒地区的农房建设中已得到成功应用,在夏热冬冷地区应用还很少见。本文尝试将EPS模块应用于典型夏热冬冷地区,通过现场性能测试,研究了EPS模块在典型夏热冬冷地区的适用性。结果表明:采用EPS模块所建农房墙体在冬夏季节均具有良好的保温隔热性能,与理论传热系数相比,存在太阳辐射时其综合传热系数较小;不存在太阳辐射时,由于窗体保温隔热性能较差,其综合传热系数偏大。室内相对湿度测试结果表明,与原有房屋相比,采用EPS模块建造的房屋室内湿度明显较低,其原因可能与新建房屋具有较好的气密性有关。 相似文献
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