掺合料种类及掺加方法对C60超高层泵送混凝土性能影响研究

Influence Research of Kinds of Admixture and Compound Method on Performance of C60 Super High-rise Pumping Concrete

通过大量试验研究了重庆地区混凝土用常见矿物掺合料的性能特点,并在其性能特点的基础上,研究了不同掺加方法对C60超高层泵送混凝土的强度、和易性、泵送性能以及含气量、压力泌水率及后期开裂等耐久性的影响。分析实验数据可知,影响其基本性能的因素主要有掺合料的种类、复掺方式、水胶比、骨料配比等。最终找到最佳复掺方式是粉煤灰、矿粉、硅灰以10:8:3的比例复掺,此时的C60超高层泵送混凝土的拌合物工作性能及后期耐久性最佳,具有较好的泵送施工性能,并通过了超高层泵送实际施工验证。

The performance characteristics of common mineral admixtures for concrete in Chongqing area are studied by a large number of experiments. On the basis of the performance characteristics of the mineral admixtures, the workability, pumping properties and early strength as well as gas content, the rate of pressure bleeding and late cracking and other durability of C60 super high-rise pumping concrete are studied under different mineral admixtures addition and compound method. The experimental data shows that the main factors affecting the performance of C60 super high-rise pumping concrete were the main types of admixtures, addition and compound method, water-cement ratio and aggregate mix ratio. The workability and durability of the C60 high-rise pumping concrete mixture were best when the mineral admixtures compound way was the fly ash, mineral powder, silica fume complex by the ratio of 10：8：3. At this time, the C60 super high- rise pumping concrete has a better pumping construction performance, and passed the actual construction verification.