早强混凝土脱模强度的试验研究

为满足Fpccp管生产及施工的需要,围绕水胶比、外加剂的掺量及蒸养参数(静养时间、升温速度、恒温时间、恒温温度及降温时间)等对C40早强混凝土脱模强度的影响因素进行了系统的试验研究,得到了满足"6h脱模强度不低于20MPa"的早强混凝土配合比(水胶比0.34、减水剂掺量1.1%、速凝剂掺量1.8%)及蒸养制度(静养时间10～30min、升温速度20～22℃/h、恒温时间120～180min、恒温温度65℃、降温时间10～40min).可加快模具周转速度,缩短生产周期,提高生产效率,节约生产成本,为Fpccp管生产及施工提供理论依据和技术支撑.

Experimental study of influential factors on stripping strength of early strength concrete

To meet the needs of production and construction for Fpccp,a systematically experimental studies of influential factors on stripping strength of early strength concrete were carried out based on water-cement ratio,admixture content and the steam curing-related parameters,such as rest period,heating-up rate,thermostatic period,thermostatic temperature and cooling time etc,suitable mix proportion(water-binder ratio 0.34,superplasticizer dosage 1.1%,rapid setting admixture dosage 1.8%) and steam-curing system(rest period 10-30 min,heating-up rate 20-22℃/h,thermostatic period 2-3 h,thermostatic temperature 65℃,cooling time 15-45 min) have been available,catering to "stripping strength of 6 hour not less than 20 MPa".It can accelerate the circulation of moulds,shorten the production cycle,improve the productivity and save production cost,making it a common technique to produce and construct pipes of Fpccp.