路面超薄层罩面的水泥混凝土配合比优化设计

发布时间：2018-06-03 07:14

本文选题：配合比 + 优化　；参考：《公路工程》2017年05期

【摘要】：根据水泥混凝土公路施工实际,通过路面超薄层快速修补技术,进行了水泥混凝土配合比设计的优化研究。结果表明,水灰比试验显示,要保证混凝土强度值,混凝土应采用较小的水灰比,但水灰比不能过小,混凝土在只用当中会存在开裂的风险,这和水泥还有石灰的比例是分不开的。从我们进行过的收缩性的试验来表明,当水泥和石灰的比例增大的时候,混凝土在使用时第一次开裂的时间会被延长。在外加剂的作用下,新拌混凝土各项性能指标得到提升,使每小时的控制坍落度降低至20 mm以下,满足了施工方面所需。水胶比越大,混凝土开裂时间越长。初裂到贯通在水胶比0.36时需要23 min,0.38时需要34 min,通常存在一个最优水胶比区域,在该区域内混凝土的贯通时间和塑性的开裂时间能够进行延长,并且延长的情况是最明显的,这个时候混凝土自身的抵抗开裂能力的情况比较好。在这篇文章当中我们主要是进行几个方面的试验还有证明,得出结论当粉煤灰掺量达到10.5%,且比例为0.38的水胶比时为最优配比,也就是B-2组配比为最优配比。
[Abstract]:According to the practice of cement concrete highway construction, the optimization of cement concrete mix ratio design is carried out through the rapid repair technology of the super thin layer. The results show that the water cement ratio test shows that the concrete strength should be guaranteed, the concrete should adopt the smaller water cement ratio, but the water cement ratio can not be too small, and the concrete will crack in the middle of the concrete. The risk, which is inseparable from the proportion of cement and lime, shows that when the proportion of cement and lime increases, the first cracking time of the concrete will be prolonged when the ratio of cement to lime is increased. The slump decrease to less than 20 mm, which meets the need of construction. The larger the water glue ratio, the longer the cracking time of concrete. The initial break through in the water glue ratio needs 23 min, and the 0.38 needs 34 min, usually there is an optimum water binder ratio area, and the concrete penetration time and the plastic cracking time can be extended in this area. And the condition of extension is the most obvious. At this time, the resistance to cracking of concrete is better. In this article, we mainly carry out several experiments and prove that the optimum ratio is that the ratio of the mixture ratio of fly ash to 10.5% and the ratio of 0.38 to the ratio of water to glue is the optimal matching of the B-2 group. Ratio.
【作者单位】：浙江建设职业技术学院;
【基金】：浙江省教育厅2015年度高等教育教学改革项目(jg2015324)高教【2015】65号
【分类号】：U416.216

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