The Effect of Superplasticizer on the Rate of Hydration of Granulated Blast-Furnace Slag-Cement Mixtures

强塑劑對於水淬高爐爐碴與水泥混合漿體之水合速率的影響

李紹先(Shawshan Lee)

《鑛冶：中國鑛冶工程學會會刊》 34卷2期 (1990/06) Pp. 114-125

https://doi.org/10.30069/MM.199006_34(2).0011

摘要

The study is a comparison of the rate of slag hydration in slag cement pastes as a function of slag type, slag homogeneity in the slag-cement blends and the quantity of superplasticizer blended into the slag cement pastes. A Portland cement, three ground granulated blast-furnace slags and a naphthalene based superplasticizer were blended into slag cement pastes with and without superplasticizer, each with an initial water/cement ratio of 0.5. The homogeneity of slag in the blended slag cement paste was studied by using a computer-controlled scanning electron microscope equipped with an energy-dispersive X-ray spectrometer and an X-Y monitor. The early stage hydration rate of slag-cement blends was also studied by using an isothermal conduction calorimeter. Moreover, the hydration kinetics was followed by determining the percentage of reacted slag in various hydration stages covering the range from 1 day up to 28 days, by a selective dissolution method. The results of these studies demonstrate several phenomena. One phenomenon is that slags with higher lime/silica ratios or a higher hydraulic index and a higher glass particle content are potentially more reactive. Another phenomenon is that the beginning two days hydration of cement pastes and slag cement pastes can be retarded by the addition of superplasticizer. The third phenomenon is that an increase of the homogeneity of slags in cement matrix as by the use of a superplasticizer can improve the degree of slag hydration.

並列摘要

本研究係比較爐碴來源，爐碴水泥拌合物中爐碴之均勻度及爐碴水泥漿體中強塑劑之添加量對於爐碴水泥漿體中爐碴水合速率之影響。一種ト特蘭水泥，三種水淬高爐爐碴粉及一種萘化合物製成之強塑劑被用來拌合成爐碴水泥漿體，其水灰比為0.5；強塑劑含量則分別為0，0.5，1.0重量％。拌合後的爐碴水泥漿體中之爐碴均勻度係利用一電腦控制且配備有能量分散式X光分光計及X－Y檢音器之掃描式電子顯微鏡來進行研究。爐碴水泥漿體之早期水合速率則係利用一恆溫傳導式熱量計來進行研究。此外，又利用選擇性溶化方法去測定爐碴水泥漿體於1天、3天、7天、14天、及28天等各種水合期齡下之未反應爐碴含量以研究爐碴水合動力學。這些研究的主要結論如下述：（1）具有較高的CaO／SiO_2，比值或水硬指數及玻璃質含量之爐碴其反應性較佳。（2）添加強塑劑於水泥漿體及爐碴水泥漿體中將延緩它們的起初2天内之水合速率。（3）添加強塑劑可增進爐碴在爐碴水泥拌合物中之均匀度，並因而可改善爐碴的水合程度。