预应力简支T梁C60高强度耐久性混凝土配合比设计

发布时间：2019-01-28 21:04

【摘要】：高强度耐久性混凝土是重载铁路桥梁承载并长期安全运营的重要保障,现有规范通常对混凝土配合比材料用量限值、耐久性指标作出规定,但在材料品质及用量对耐久性指标、强度增长、和易性影响方面尚无明确规定。本文对重载铁路预制预应力后张法简支T梁C60高强度耐久性混凝土配合比设计过程中所遇到的材料品质、耐久性、强度增长等问题进行分析,通过对工点周边现有一般品质材料进行试验,分析配合比设计参数之间的关系,在规定限值范围内平衡设计参数之间的矛盾,确定最佳设计参数,解决了混凝土配合比设计时材料品质、耐久性、水胶比、强度、和易性不易兼顾的技术难题。
[Abstract]:High strength and durability concrete is an important guarantee for carrying capacity and long-term safe operation of heavy-duty railway bridges. The existing codes usually stipulate the limit value of concrete mix material amount and durability index, but in material quality and quantity, the durability index is determined. Strength growth, and ease of impact is not clearly defined. In this paper, the problems of material quality, durability and strength growth encountered in the design of C60 high strength and durability concrete mixture of Zhang Fa simply supported T beam after prestressing of heavy haul railway are analyzed. Through the test of the existing general quality materials around the work point, the relationship between the design parameters of the mix ratio is analyzed, and the contradiction between the design parameters is balanced within the prescribed limit, and the optimum design parameters are determined. The technical problems of material quality, durability, water / binder ratio, strength and easiness are solved.
【作者单位】：济南铁路诚意工程检测有限公司;
【分类号】：U444

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