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通过测试掺入纤维的早强型支座砂浆的抗压强度、抗折强度、劈裂抗拉强度、弹性模量和韧性指数,研究了混杂纤维对早强型支座砂浆的增韧效果.结果表明:掺入纤维可以提高砂浆的抗压强度,显著提高了砂浆的抗折强度、劈裂抗拉强度和弹性模量.混杂纤维的最佳掺入比例为0.6%钢纤维+0.2%玻璃纤维+0.2%聚丙烯纤维,使砂浆28 d的抗压强度、抗折强度、劈裂抗拉强度和弹性模量分别提高7%、68%、44%和53%,压折比从空白样的6.35降低到4.03,大大提高了砂浆的韧性指数,增强了砂浆的韧性. 相似文献
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The influences of silica fume and aluminum sulfate on hydration process of sulfoaluminate cement were carried out by ring flow, setting time, hydration heat, XRD and DTG analyses. In addition, mortar mixtures with different functional additives have been studied through compressive strength, flexural strength, volume stability at early age and porosity characterization tests. The results show that the addition of silica fume and aluminum sulfate reduces the fluidity and shortens the setting time of sulfoaluminate cement paste, promoting hydration process and increasing hydration products at early age. In the case of appropriate proportion of mortar, the inclusion of hydroxy propyl methyl cellulose, dispersible polypropylene fiber and organic silicon kind of defoamer can control segregation and bleeding, improve mechanical strength and volume stability at early age, and modify the pore distribution of sulfoaluminate cement mortar, respectively. The sulfoaluminate cement mortar can carry out gravitational grouting in the absence of outside force, the compressive strength of 2 hours and 24 hours have reached 26 and 58 MPa respectively, and have good microexpansion and tiny pore distribution characterization. 相似文献
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碳酸钙是一种传统的无机盐化工产品,广泛应用于塑料、橡胶、涂料、造纸等领域。随着近年来碳酸钙产品同质化、资源配置低端化、发展滞逆化等问题日益严重,技术含量低、性能低下且功能单一的碳酸钙产品已经无法满足目前碳酸钙产业高质量发展的需求。为解决目前碳酸钙行业发展面临的问题,本文以广西壮族自治区玉林市兴业县碳酸钙产业为例,在分析国内外碳酸钙产业发展现状的基础上,调研了兴业县石灰岩资源开发利用现状,以国家及政府相关政策为指导,以市场需求为导向,以国家行业法律法规及标准为准绳,以资源节约与产业高质量发展为核心,对新形势下兴业县高质量碳酸钙产业发展进行思考,为我国建设高质量碳酸钙产业集群规划设计提供理论指导。 相似文献
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碳酸钙作为最广泛的工业原料之一,被广泛应用在塑料、橡胶、造纸、涂料、食品、医药、电子等行业。而具有特殊纤维状形貌的碳酸钙晶须,成本低廉,来源广泛,产品本身及生产工艺绿色环保,并且具有高强度、高模量、高拉伸率等优良性能,开始逐渐取代其他成本高昂的纤维材料用作复合材料的增强剂、增韧剂及填充剂。本文在研究团队多年从事钙基材料制备及产业化的基础上,从碳酸钙晶须的制备方法和原料两个角度对碳酸钙晶须材料研究进行了详细论述,分析目前各种碳酸钙晶须制备方法的优缺点,并对工业废弃物、生活废弃物等多样性原料制备碳酸钙晶须的方向进行了展望。 相似文献
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