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首页> 外文会议>4th International Moratuwa Engineering Research Conference >Effect of Fly Ash on Self-healing of Cracks in Concrete
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Effect of Fly Ash on Self-healing of Cracks in Concrete

机译：粉煤灰对混凝土裂缝自我修复的影响

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The design of water retaining structures is mainly based on the serviceability limit state crack control. The allowable crack width depends on the self-healing ability of concrete and the use of supplementary cementitious material like fly ash in concrete mixes might affect it. Therefore, an experimental investigation was carried out to find the influence of fly ash on self-healing process. Water is sent through artificially induced cracks in a specimen for autogenous healing to take place at a constant pressure gradient across the specimen. To determine the level of self-healing, the flow through the crack was measured with time to obtain the sealing time. Fly ash percentages of 20%, 30% and 40% were tested along with a 0% fly ash mix. Insignificant variation was shown for initial drop in flow rate across fly ash percentages used in this study. Significant reduction in sealing time was observed for 20% and 30% fly ash mixes as compared to 0% fly ash whereas higher fly ash percentages (40%) showed insignificant reduction.
机译：保水结构的设计主要基于使用寿命极限状态裂缝控制。允许的裂缝宽度取决于混凝土的自我修复能力，在混凝土混合物中使用粉煤灰等辅助胶凝材料可能会对其产生影响。因此，进行了实验研究以发现粉煤灰对自愈过程的影响。水通过样品中的人工裂缝产生自生愈合，并在样品上以恒定的压力梯度发生。为了确定自我修复的水平，随时间测量通过裂缝的流量以获得密封时间。测试了粉煤灰百分比为20％，30％和40％，以及粉煤灰混合物为0％。对于本研究中使用的粉煤灰百分比，其流量的初始下降显示出很小的变化。与0％的粉煤灰相比，20％和30％的粉煤灰混合物的密封时间显着减少，而较高的粉煤灰百分比（40％）显示出明显的减少。

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