|The primary benefit of calcium chloride in concrete is an accelerated rate of hydration for cement. This significantly reduces setting time to facilitate rapid attainment of early strength and easier protection of freshly placed concrete in cold weather.
Manufacturers of ready mixed concrete have used calcium chloride for over 50 years to give their contracting customers the performance they want and the durable product they require.
Ready mixed concrete containing calcium chloride offers significant economic benefits to concrete contractors by reducing costs and improving their overall performance and profits.
Anytime the temperature drops below 20°C, the setting of ready mixed concrete slows down. This effect is most significant in the 0°C to 10°C temperature range. The rapid setting offered by the addition of calcium chloride to ready mixed concrete allows concrete contractors to continue to work effectively into the fall and winter months.
In cool and cold weather concreting applications, calcium chloride can be used to reduce setting times by as much as two-thirds. A two percent admixture of calcium chloride at 10°C will improve setting times to that attainable at 20°C without calcium chloride.
This rapid setting can be critical when there is a chance that temperatures may drop below freezing. Calcium chloride accelerates the rate of hydration of freshly placed concrete and lowers its free water content faster.
This allows concrete to escape potential freeze damage in a matter of days, as opposed to the weeks it can take normally. It also minimizes the costly precautions required to protect freshly placed concrete from serious freeze damage.
High Early Strength
In applications where time is of the essence such as foundations and emergency patching of pavement, the addition of calcium chloride to ready mixed concrete can reduce the waiting period before surfaces can bear loads.