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Experimental Study on Mechanical Properties of Basalt-Fiber-Reinforced Nano-SiO2 Concrete After Being Subjected to High Temperatures
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摘要: 对高温作用下的素混凝土、纳米SiO2混凝土、玄武岩纤维增强纳米SiO2混凝土进行抗压、劈裂抗拉和抗折试验,建立了混凝土强度预测模型。结果表明:各组混凝土抗压强度均在400 ℃时达到峰值,此时各组混凝土较常温时提高范围为3.5%~6.8%,随后逐渐降低;劈裂抗拉强度和抗折强度均随着温度的升高而逐渐降低,800 ℃时,素混凝土的劈裂抗拉强度残余率和抗折强度残余率分别为27.6%、36.2%。纳米SiO2的掺入提高了素混凝土的抗压、劈裂抗拉和抗折强度。掺入玄武岩纤维后的纳米SiO2混凝土在800℃高温后的抗压强度、劈裂抗拉强度、抗折强度最大分别提高了33.7%、15.6%、17.2%。建立的高温作用后混凝土强度预测模型的精确度较高。Abstract: The compressive, splitting tensile and flexural tests of plain concrete, nano-SiO2 concrete and basalt fiber nano-SiO2 concrete under high temperatures were carried out, and the prediction model of concrete strength that was established. According to the results, the compressive strength of each group reached a peak value at 400 ℃, at that time, each group of concrete at normal temperature increased by about 3.5% to 6.8%, and then decreased gradually, and the splitting tensile strength and flexural strength decreased gradually with the increase of temperature, at 800 ℃, the residual ratios of cracking and pulling strength and the residual ratios of flexural strength were 27.6% and 36.2%, respectively. Adding nano-SiO2 could improved the compressive, splitting tensile and flexural strength of plain concrete. The compressive strength, splitting tensile strength and flexural strength of nano-SiO2 concrete after being subjected to 800 ℃ high temperature were increased by 33.7%,15.6% and 17.2% respectively. The accuracy of concrete strength prediction after being subjected to high temperatures was high.
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Key words:
- basalt fiber /
- nano-SiO2 concrete /
- high temperature /
- mechanical property
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