期刊
ADVANCES IN CEMENT RESEARCH
卷 23, 期 2, 页码 69-74出版社
ICE PUBL
DOI: 10.1680/adcr.9.00019
关键词
-
资金
- National Natural Science Funds [50925829]
Magnesium phosphate-based cements are rapid setting materials. Retarders are often used to prolong the setting time of magnesium phosphate-based cements. Magnesium phosphosilicate cement (MPSC) is a new type of magnesium phosphate-based cement, which is composed of magnesia, phosphate and silicate materials, such as fly ash. MPSC has the characteristics of rapid setting and high early strength. In the present study, the effect of different additives, sodium tripolyphosphate (ST), borax (NB) and boric acid (BA) on the properties of MPSC was investigated, including the setting time, temperature rise of cement during initial hydration and strength development. In comparison with the MPSC sample without additive, ST had an acceleration effect on the setting process, whereas NB and BA had a retarding effect on the hydration. BA had a longer retardation time than NB. The higher the rate of temperature rise, the higher was the reaction rate, the shorter was the setting time, and the higher was the early strength. Hydration products of MPSC were analysed by X-ray diffraction. The results showed that a cementitious hydrate, MgKPO(4)center dot 6H(2)O (MKP), formed in the hardened cement paste. There was no new product formed after the additives were incorporated in the hydration system, they might influence the formation rate of MKP during reaction.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据