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Restrained shrinkage cracking of self-consolidating concrete roads

机译：自固混凝土路​​的约束收缩裂缝

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摘要

The present study is dedicated to investigate the liability of continuously reinforced concrete pavement (CRCP) cast with self-consolidating concrete (SCC) to restrained shrinkage cracking and the values of restraint stresses in these pavements. SCC, which is becoming increasingly popular due to its several superiorities over conventionally vibrated concrete (CVC), has higher amounts and rates of shrinkage compared to CVC. The higher risk of restrained shrinkage cracking of SCC is a great cause of concern in pavement construction as the penetration of water, chemicals, and salts increases the risk of corrosion of reinforcement. In the present study, an analytical restraint stress expression was developed for typical CRC pavements by modifying the restraint stress equation developed previously for RC beams. Using this equation, the restraint stresses induced to the longitudinal reinforcement by the rigid pavement, cast with CVC or SCC, were calculated for eight different example sections. These restraint stress values were found to reach up to 50% of the limit stresses of bars, allowed by the design guidelines, when the pavement is cast with SCC. The amounts of longitudinal reinforcement used in typical CRCP roads were found to be more critical when the pavement is cast with SCC.
机译：本研究致力于研究采用自密实混凝土（SCC）浇筑的连续钢筋混凝土路面（CRCP）对约束的收缩裂缝的影响以及这些路面的约束应力值。 SCC由于其比常规振动混凝土（CVC）的多种优势而变得越来越受欢迎，与CVC相比，它具有更高的收缩率和收缩率。由于水，化学物质和盐的渗透增加了钢筋腐蚀的风险，因此在路面施工中，抑制SCC收缩裂缝的较高风险是引起关注的重要原因。在本研究中，通过修改先前为RC梁开发的约束应力方程，开发了用于典型CRC路面的解析约束应力表达式。使用该方程式，对于八个不同的示例截面，计算了用CVC或SCC浇铸的刚性路面对纵向钢筋产生的约束应力。当使用SCC浇筑路面时，发现这些约束应力值达到了设计准则允许的钢筋极限应力的50％。当使用SCC浇筑路面时，发现在典型的CRCP道路中使用的纵向加固量更为关键。

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