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首页> 外文期刊>Construction and Building Materials >Research on effect of limestone and gypsum on C_3A, C_3S and PC clinker system
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Research on effect of limestone and gypsum on C_3A, C_3S and PC clinker system

机译：石灰石和石膏对C_3A，C_3S和PC熟料系统影响的研究

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摘要

The effect of substitution of limestone for gypsum on hydration rate, hydration products, setting time and strength development of C_3A, C_3S and PC clinker systems were studied separately. Following results were obtained: The hydration of C_3A was greatly stayed by gypsum, and that CaCO_3 accelerated the hydration of C_3A. There were ettringite and C_3A·CaCO_3·11H_2O as products of C_3A-CaCO_3 CaSO_4·2H_2O paste but no C_3AH_6 was detected. That's the reason why setting time of C_3A-CaCO_3-CaSO_4·2H_2O paste could be controlled by partial substitution of CaCO_3 for CaSO_4·2H_2O in proportion of 20% ~ 60% which was also favorable to strengths of C_3A-CaCO_3-CaSO_4·2H_2O paste. Both CaCO_3 and CaSO_4·2H_2O could accelerate hydration of C_3S and increase the strengths of C_3S paste. CaSO_4·2H_2O enhanced the strength of C_3S paste by going into C-S-H in some way and CaCO_3 did it by reacting with Ca(OH)_2. The enhancement of CaCO_3 to C_3S paste was less than that of CaSO_4·2H_2O. CaCO_3 and CaSO_4·2H_2O coexisting were favorable to later strengths of C_3S paste. The results of PC clinker with limestone and gypsum were in agreement with those of C_3A-CaCO_3-CaSO_4 · 2H_2O system and C_3S-CaCO_3-CaSO_4·2H_2O system. The properties of PC clinker with gypsum and limestone as regulator for setting time were similar to those with gypsum alone when the substitution of limestone for gypsum was controlled below or equal 50%.
机译：分别研究了石灰石代替石膏对水合速率，水合产物，凝结时间和C_3A，C_3S和PC熟料体系强度发展的影响。得到以下结果：石膏极大地阻止了C_3A的水合，而CaCO_3促进了C_3A的水合。作为C_3A-CaCO_3CaSO_4·2H_2O糊的产物，有钙矾石和C_3A·CaCO_3·11H_2O，但未检出C_3AH_6。这就是为什么可以通过将CaCO_3部分替换为CaSO_4·2H_2O的比例为20％〜60％来控制C_3A-CaCO_3-CaSO_4·2H_2O糊剂的固化时间的原因，这也有利于C_3A-CaCO_3-CaSO_4·2H_2O糊剂的强度。 。 CaCO_3和CaSO_4·2H_2O均可促进C_3S的水合作用并提高C_3S糊的强度。 CaSO_4·2H_2O通过以某种方式进入C-S-H来增强C_3S浆料的强度，而CaCO_3通过与Ca（OH）_2反应来增强强度。 CaCO_3对C_3S糊的增强作用小于CaSO_4·2H_2O。 CaCO_3和CaSO_4·2H_2O共存有利于后期C_3S胶的强度。用石灰石和石膏制成的PC熟料的结果与C_3A-CaCO_3-CaSO_4·2H_2O系统和C_3S-CaCO_3-CaSO_4·2H_2O系统的结果一致。当将石灰石替代石膏的含量控制在50％以下时，以石膏和石灰石作为凝结时间调节剂的PC熟料的性能与单独使用石膏的相似。

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