Hot weather can have many negative effects on fresh and hardened concrete properties, including increased water demand, accelerated rate of cement hydration, increased moisture and slump loss, faster setting times, increased plastic- and drying-shrinkage cracking, and lower ultimate strengths. But construction doesn't have to stop when air temperatures rise above 90øF. By adding chemical admixtures to concrete mixes, you can improve concrete workability while reducing total water content. Other benefits included increased concrete strength and durability and lower total in-place costs.
Article discusses the types of chemical admixtures commonly used to improve concrete performance in hot weather, including:
- Conventional water reducers
- Mid-range water reducers
- High-range water reducers
- Retarding and extended-set control admixtures