INFLUENCE OF CALCIUM NITRITE ON THE HYDRATION OF HIGH VOLUME SLAG CEMENT

： This paper discusses the influence of calcium nitrite and limestone powder on the strength and the hydration reaction of high volume slag cement （HVSC）. By adding of calcium nitrite, the compressive strength of HVSC mortars are increased. The reaction of BFS similar to OPC is accelerated by calcium nitrite in HVSC. The acceleration of slag reaction by calcium nitrite is related to the formation of AFm（NO 2 ）. Therefore, though the reaction amount of BFS is increased, AFt is mainly formed by adding of calcium nitrite. The formation of AFt is important for the reduction of shrinkage of HVSC. By adding of both calcium nitrite and LSP, the strength of mortar is similar to that of mortar with calcium nitrite, but the total pore of hardened samples is decreased. This is a very important factor for the improvement of durability of HVSC.