掺加萘系减水剂的SCC配合比设计方法研究

Study on Design Method of SCC Mix Ratio Added with Naphthalene Series Water Reducers

自密实混凝土(简称SCC)配合比设计方法在国内没有统一的方法。在设计过程中,新拌混凝土的工作性非常敏感,受原材料质量、配料准确性等因素波动的影响而大幅度变化,从而造成自密实混凝土的技术发展受到了一定的限制。通过介绍国内较先进的固定砂石体积法、全计算法、改进全计算法、参数设计法、骨料比表面积法、简易配合比设计方法 6种方法各自特点,选择比较成熟的固定砂石体积法、改进全计算法、参数设计法对C60自密实混凝土进行了工作性能以及力学性能对比试验。通过试验表明:固定砂石体积法参数选取明确,设计过程较简单,工作性能较稳定,具有一定的适用性。

There is no unified method of the mix ratio design methods of self-compacting concrete(SCC) in China. In the design process, the work property of fresh mixed concrete is very sensitive and is greatly changed by the factor influence of raw material quality and batching accuracy so that the technical development of SCC is certainly limited. According to the introduction of the more advanced characteristics of six methods, i.e. the fixed sand gravel volume method, full calculation method, improved full calculation method, parameter design method, aggregate specific surface area method and simple mix ratio design method, the well-known fixed sand gravel volume method, improved full calculation method and parameter design method are selected to compare and test the work property and mechanical property of C60 SCC. The test result shows that the parameter selection of fixed sand gravel volume method is explicit, its design process is simpler, and its work property is more stable with certain applicability.