引气剂对混凝土性能的影响

通过对引气剂作用机理的分析，就引气剂对新拌混凝土性能和混凝土抗冻性、抗压强度、抗折强度的影响给予评述。试验表明：在相同水泥用量和坍落度的条件下，引气剂掺量越大，混凝土含气量就越大。抗压强度损失率就越大；在含气量小于6%时，随着含气量的增加，混凝土的韧性增加；引气剂掺量一定时，随着混凝土拌合物坍落度增大．混凝土含气量的变化呈抛物线形状。混凝土用水量一定时，引气剂掺量越大，混凝土坍落度就越大；同萘系减水剂复合使用时，将引起混凝土含气量一定程度的下降。

Air-entraining Additive on Concrete Capability

The article studies the effects of the air-entraining additive on the capability of fresh concrete, the freeze ability, the cpmpressive resist ance, and the breaking strength of the concrete. It is found that under the same condition of slump and the same dosage of cement, the more air entraining additive is used, the more air content is, and the more the loss rate of compressive resistance. When air content is less than 6%, the tenacity of concrete increases with the air-entraining quantity. While air-entraining additive remains the same the air-entraining quantity in concrete changes as parabola, with the slump of mixing concrete increases. When the water using is the same, the more air-entraining additive is used, the more the slump of concrete is when the naphthaline-series water reducing agent and the air-entraining quantity are used together, and air content in concrete is reduced to some extent.