监测喷射混凝土的硬化和强度发展的一种新方法(英文)

Principles of Monitoring Hardening and Strengthening of Shotcrete

提出了一种新的监测喷射混凝土硬化和强度发展的方法。该方法在"Modiin-Jerusalem"铁路隧道建设工程中得到了实际应用。其最初目的是用来预测评估混凝土的拆模时间。基于直接测量混凝土构件中的电阻率和温度的发展,估测了隧道结构中混凝土的硬化和强度发展。通过组合分析电阻率和温度的发展曲线,构建了一个通用的"强度--电阻率"关系,并依此开发了用于监测早龄期(24h内)喷射混凝土的硬化和强度发展的算法。这个算法可以用于估算混凝土构件达到一定强度所需要的时间,也可用于评估混凝土搅拌站供应到施工现场的混凝土的性能稳定性。

The principles of monitoring the hardening and strengthening of shotcrete applied in the process of building the ＂Mo- diin-Jerusalem＂ railway tunnel were presented. Monitoring has a primary goal to assess the time in which the concrete reaches the set level of strength to allow formwork dismantling. Shotcrete hardening and strengthening in the tunnel was estimated based on the results of continuous measurements of specific electric resistivity and temperature directly in the concreted ele- ment Based on the results of a joint analysis of the resistivity and temperature kinetic curves, a general ＇Istrength-resistivity＂ correlation was proposed, and the monitoring algorithm of shotcrete hardening and strengthening in its early age （within the first 24 hours） was developed. This algorithm was used to estimate the time in which the required （regulated） strength is achieved directly in the concreted element mass and the work stability of the factory supplying the concrete to the building site.