不同配比下超早期混凝土与模板之间侧向作用

发布时间：2018-03-20 17:48

本文选题：超早期混凝土　切入点：模板　出处：《同济大学学报(自然科学版)》2016年11期 　论文类型：期刊论文

【摘要】：超早期混凝土对模板的侧向压力直接影响到模板设计,其大小受浇筑速度、混凝土配比、温度、模板表面性态、尺寸、形状、浇筑深度等诸多因素影响,作用机制非常复杂.在理论分析的基础上,设计了一个可以测量不同配比下混凝土对模板侧向压力的模型试验,并对试验结果进行了分析.试验结果表明,侧向压力竖向分布与静水压力相似,但明显小于静水压力;混凝土水灰比(质量比)越大,模板初始侧向压力越接近静水压力,侧向压力下降速度越快;超早期混凝土侧向压力的消散发生在潜伏期之后的水化反应阶段,此阶段水化产物的加速形成使材料具有自承载能力,因此侧向压力迅速下降并最终消失.
[Abstract]:The lateral pressure of super early concrete directly affects the design of the formwork, and its size is affected by many factors, such as pouring speed, concrete ratio, temperature, surface state, size, shape, pouring depth, etc. The mechanism of action is very complicated. On the basis of theoretical analysis, a model test is designed to measure the lateral pressure of concrete to formwork under different proportions, and the experimental results are analyzed. The vertical distribution of lateral pressure is similar to that of hydrostatic pressure, but obviously smaller than that of hydrostatic pressure, the larger the mass ratio of concrete water to cement, the closer the initial lateral pressure of the formwork is to the hydrostatic pressure, and the faster the decrease of lateral pressure is. The dissipation of lateral pressure of super-early concrete occurs in the hydration reaction stage after the incubation period, in which the accelerated formation of hydration products makes the material have self-loading capacity, so the lateral pressure decreases rapidly and finally disappears.
【作者单位】：天津大学水利工程仿真与安全国家重点实验室;中水北方勘测设计研究有限责任公司;
【基金】：国家自然科学基金(51321065,51279126) 天津市自然科学基金(13JCQNJC06800)
【分类号】：TU755.2

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