高钙粉煤灰用于高性能混凝土体积稳定剂的研究

Study on High-lime Fly-ash Used for Volume Stabilizer of HPC

根据对上海地区某些高钙粉煤灰膨胀特性的研究,提出了高钙粉煤灰用作高性能混凝土体积稳定剂的可行性,并将改性后的高钙粉煤灰以大掺量用于普通泵送混凝土中。结果表明,它具有补偿混凝土塑性收缩和早期化学减缩的能力,可提高普通泵送混凝土的抗裂性,从而实现普通泵送混凝土的高性能化,同时还可获得显著的经济和社会效益。此外还提出了高性能混凝土体积稳定性的量化指标。

Based on investigation of expansion performaces of some high-lime fly ash discharged from shanghai, the feasibility on utilization of high-lime fly ash as a volume stabilizer is put forward and the improved high-lime fly ash is used in ordinary pumping concrete with a large content. The rezults show that there is an ability for compansating the plastic shrinkage and the chamical contract at early age, so that the resistance to cracking of concrete is imcreased. Besides, the quantitative criterions for volume stability of HPC are put forward.