INFLUENCE OF ORDINARY ACCELERATORS ON HYDRATION OF BELITE CEMENT

GUO Suihua FENG Peizhi ZENG Yimin LUO ShiyongChina Building Materials Academy Wuhan University of TechnologyUniversity of Technology and Science Beijing

摘 要：<正> The study revealed that ordinary accelerators for Portland cement also improves early strength of Belite cement remarkably, but one serious defect exists which lead to a high strength reduction at the age of 28 days. The paper analyzes the action mechanism of ordinary accelerators on Belite cement. It shows that these accelerators can not accelerate the hydration of β-C2S directly. The reason that they can increase early strength of Belite cement is that they can promote hydration of C3A and C4AF, through which can make early hydration of β-C2S in clinker advanced relatively. The strength reduction at 28 day age is mainly because these accelerators restrain the further hydration of β-C2S at later age. Considering these results, we obtain basic requirements of ideal accelerators for Belite cement.

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