乌鲁木齐地区超高韧性水泥基复合材料基本力学性能试验研究

发布时间：2018-05-30 16:31

本文选题：超高韧性水泥基复合材料 + 配合比　；参考：《新疆大学》2017年硕士论文

【摘要】：超高韧性水泥基复合材料(Engineered Cementitious Composites,ECC)是一种具有良好拉伸变形和弯曲变形能力的纤维增强水泥基复合材料,该复合材料的原材料主要包括水泥,细砂、矿物掺合料等。原材料的性能对超高韧性水泥基复合材料的基本力学性能和变形能力具有一定的影响,本文基于乌鲁木齐地区原材料配制ECC,对该材料制作的试件进行基本力学性能试验研究。通过单轴拉伸试验,研究了水胶比、矿物掺合料种类(粉煤灰、矿粉)以及掺量、龄期等因素对ECC试件的初始开裂强度、极限抗拉强度、拉伸位移等性能的影响,并运用层次分析法确定了最优配合比;在此基础上,采用沙漠砂替代水洗砂,制作单轴拉伸试件、立方体抗压试件、抗弯试件,通过试验及其结果分析,得出水洗砂和沙漠砂的PE-ECC试件在破坏形态、拉伸性能、抗压性能、抗弯性能等方面的差异;浇筑与ECC板同尺寸的钢筋混凝土板试件进行抗弯试验,通过对比分析试验结果,得出三组板的破坏形态、初始抗弯开裂荷载、极限荷载、弯曲变形等的差异。通过上述试验及结果分析,采用乌鲁木齐地区原材料配制ECC和采用沙漠砂替代水洗砂配制ECC是可行的,并表现出了良好的拉伸性能和抗弯性能,为超高韧性水泥基复合材料在新疆地区的推广应用提供了一定的数据支撑和理论依据。
[Abstract]:Engineered Cementitious composites (Ecc) is a kind of fiber reinforced cement matrix composites with good tensile and flexural deformation. The raw materials of this composite mainly include cement, fine sand, mineral admixture and so on. The properties of raw materials have a certain influence on the basic mechanical properties and deformability of ultra-high toughness cement matrix composites. In this paper, the basic mechanical properties of the specimens made of ECCs are studied based on the raw materials in Urumqi. Through uniaxial tensile test, the effects of water / binder ratio, mineral admixture type (fly ash, mineral powder), amount of mineral admixture and age on the initial cracking strength, ultimate tensile strength and tensile displacement of ECC specimens were studied. On the basis of this, desert sand is used instead of washing sand to make uniaxial tensile specimen, cube compression specimen and bending specimen. The difference of failure form, tensile property, compressive property and flexural property of PE-ECC specimen with water washing sand and desert sand is obtained, and the bending test of reinforced concrete slab with the same size as ECC slab is carried out, and the results are compared and analyzed. The difference of failure form, initial bending cracking load, ultimate load and bending deformation of three groups of plates are obtained. Through the above experiments and analysis of the results, it is feasible to prepare ECC with raw materials in Urumqi and to prepare ECC with desert sand instead of washing sand, and shows good tensile and flexural properties. It provides some data support and theoretical basis for the extension and application of ultrahigh toughness cement matrix composites in Xinjiang.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528.04

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