自密实混凝土生产投料控制精度研究

RESEARCH ON PRECISION OF BATCHING CONTROL IN PRODUCING SELF-DENSE CONCRETE

自密实混凝土与普通混凝土在强度影响因素上有显著的差别,因此在生产中对于原材料的投料精度要求也应有所不同。在系统研究砂率、粉煤灰掺量、胶集比、单方用水量及外加剂用量波动对C40自密实混凝土工作性和强度的影响的基础上,确定了其投料精度控制范围。普通混凝土对骨料的控制精度要求低,自密实混凝土对骨料的控制精度要求高。

Self-compacting concrete differs obviously from ordinary concrete in the influential factors of strength, therefore the requirement for the batching precision of raw materials should also be some different in the production. The scope of batching control precision is determined on the base of systematic research on the impacts of sand coarse aggregate ratio, quantity of mixed fly ash, cement aggregates ratio, unit water consumption and variation of additive quantity on the workability and strength of C40 self-compacting concrete. Low aggregate controlling precision is required for the ordinary concrete while high precision requirement is needed for the self-compacting concrete.