Effects of High-Range Water Reducers on the Properties of Fresh and Hardened Concrete

摘要

The evaluation of high-range water reducers on the properties of fresh and hardened concrete under hot and cold weather conditions is described. Four different types of superplasticizers were evaluated: two first generation types and two second generation types. In addition, the effect of superplasticizers on retarding and air-entraining admixtures was investigated. A laboratory testing program consisting of fifteen laboratory mixes and one field mix was used for evaluation of the superplasticizers. The results of the testing program are presented along with recommendations to field engineers.