Influence of alkali activators on the early hydration of cement-based binders under steam curing condition
Influence of alkali activators on the early hydration of cement-based binders under steam curing condition
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碱活化剂对蒸汽养护条件下水泥基粘结剂早期水化的影响
DOI：
10.1007/s10973-017-6528-5
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发表时间：
2017-06
影响因子：
4.4
通讯作者：
Fang Zhenggang
中科院分区：
文献类型：
--
作者：
Wang Dengquan;Wang Qiang;Fang Zhenggang
研究了水玻璃、NaOH、Na 2SO 4和Na 2CO 3对普通水泥以及掺40%（质量分数）磨细矿渣和40%（质量分数）粉煤灰的两种复合胶凝材料在60 °C蒸养温度下早期水化的影响。同时，将20 °C固化条件设定为参考。结果表明，水玻璃、NaOH和Na 2CO 3能提高胶结料在加速期的放热速率，促进矿渣与粉煤灰的反应。然而，碱激发剂在减速期抑制了波特兰水泥的水化，在60 °C时抑制作用更为显著。因此，碱激发剂不能有效地增加蒸汽养护下16 h内的累积水化热，甚至出现降低。Na 2SO 4对复合胶凝材料的早期水化有较好的促进作用，但不能有效提高水化热。结果还表明，所有碱激发剂均显著降低了水泥-矿渣复合胶凝材料的脱模强度。对于水泥-粉煤灰复合胶凝材料，低浓度水玻璃和高浓度Na 2SO 4激发的试样的脱模强度接近于与水反应的脱模强度，而其他碱性溶液激发的试样脱模强度较低。总体而言，四种碱性激发剂均不能提高大掺量矿物掺合料蒸养砂浆的拆模强度。
The effects of water glass, NaOH, Na2SO4, and Na2CO3on the early hydration of plain cement and two composite binders incorporating 40 mass% ground granulated blast furnace slag (GGBS) and 40 mass% fly ash under the steam curing temperature of 60 °C were investigated. Meanwhile, a 20 °C curing condition was set as a reference. The results showed that water glass, NaOH, and Na2CO3can improve the exothermic rates of the binders at the acceleration period and promote the reaction of GGBS and fly ash. However, the alkali activators inhibited the hydration of Portland cement at the deceleration period, which was more significant at 60 °C. Thus, the alkali activators cannot efficiently increase the cumulative hydration heat within 16 h under steam curing or even appear to decrease. Na2SO4shows a better performance than the other three alkalis in the early hydration of the composite binders due to its promotion on the formation of AFt, but it cannot efficiently increase the cumulative hydration heat too. The results also showed that all of the alkali activators significantly decreased the form-removal strength of cement–GGBS composite binder. For cement–fly ash composite binder, the form-removal strengths of the samples activated by a low concentration of water glass and high concentration of Na2SO4were close to that reacted with water, while the form-removal strengths of the samples activated by other alkaline solutions were lower. Overall, the four alkali activators cannot improve the form-removal strength of steam-cured mortar containing a large volume of mineral admixtures.
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影响因子：
7.4
作者：
Junaid, M. Talha;Kayali, Obada;Black, Jarvis
通讯作者：
Black, Jarvis
DOI：
10.14359/6092
发表时间：
1997-08
期刊：
SP-171: Third CANMET/ACI International Symposium on Advances in Concrete Technology
影响因子：
--
作者：
D. Ho;G. Chirgwin;S. Mak
通讯作者：
D. Ho;G. Chirgwin;S. Mak
DOI：
10.1016/j.egypro.2012.01.134
发表时间：
2012
期刊：
Energy Procedia
影响因子：
--
作者：
He Zhimin;Liu Jun-zhe;Zhu Kangwu
通讯作者：
He Zhimin;Liu Jun-zhe;Zhu Kangwu
影响因子：
11.4
作者：
J. I. Escalante-García;A. Gorokhovsky;G. Mendoza;A. F. Fuentes
通讯作者：
J. I. Escalante-García;A. Gorokhovsky;G. Mendoza;A. F. Fuentes
影响因子：
11.1
作者：
Abdalqader, Ahmed F.;Jin, Fei;Al-Tabbaa, Abir
通讯作者：
Al-Tabbaa, Abir