不同温度下水泥、粉煤灰再生微粉体系反应程度与抗压强度 关系

Relationship Between Reaction Degree and Compressive Strength for Cement and Fly Ash Regeneration Powder System under Different

浏览量:

关键词:

水化程度;水泥;粉煤灰;动力学

Key words:

Hydration degrees; Cement; Fly ash; Kinetics

刊期:

2017年第3期

DOI:

文章编号:

1000-4637(2017)03-09-06

基金项目:

国家自然科学基金(51403182);云南省教育厅科学研究基金(2012TC)

作者:

李 琴1,张春红2,陈秋玲3,孙可伟4

单位:

1.云南开放大学化学工程学院,昆明650223;2.云南大学生态学与环境学院,昆明 650091;3.昆明理工大学环境科学与工程学院,650500;4.昆明理工大学固体废弃物国家工程研究中心,650093

摘要

摘   要:根据共存于体系中水泥、活性物质水化反应中间物Ca(OH)2产生和消耗,研究其水化反应动力学特征,以此为基础计算在不同养护温度、养护时间及体系中粉煤灰量对水泥、活性物质的水化程度大小,并以此配比进行抗压强度试验。研究结果发现当养护温度低于40℃时,体系的水化程度与抗压强度均随着温度升高、龄期延长、粉煤灰量增加而提高;养护温度高于40℃时,体系水化程度随着温度升高,龄期延长而升高,尤其是15%粉煤灰掺量时水泥能够完全水化。高于40℃体系抗压强度随着温度升高而降低,随着龄期延长而增大,高温时体系水化程度和抗压强度变化趋势不同。

Abstract: Cement and active substances hydration reaction kinetics characteristics are researched in the coexisting system by researching their hydration reaction intermediate Ca(OH)2 consumption rate. And the calculation on the hydration degree of cement and fly ash with the dosage of fly ash at different temperature and curing time is carried out. And the experiment ratio of the compressive strength on the recycle mortar is determined. The results shows that when the curing temperature is lower than 40℃, the degree of hydration and compressive strength of the system increases with the temperature, age extension and the fly ash dosage. When the curing temperature is higher than 40℃, the hydration degree increases with the temperature increase and age extension, especially when the fly ash content is 15%, the cement could be completely hydrated. The compressive strength of the system decreases with increasing temperature, when curing temperature is higher than 40℃, the trend of hydration and compressive strength varied with the age extension.

结论

(1)不同温度下对水泥、活性物质、抗压强度影响情况是:水泥水化温度低于40℃时,水泥的水化程度较低,活性物质的水化程度较高,粉煤灰加量不能促使水泥完全水化,抗压强度不高;水泥水化温度高于40℃时,水泥的水化程度较高,活性物质的水化程度降低,砂浆抗压强度较高;15%粉煤灰参与下,在40℃、60℃、80℃温度下能够使水泥完全水化,活性物质水化程度达到最高,因而砂浆抗压强度最高。
(2)养护龄期和体系内粉煤灰量对水泥、活性物质、抗压强度影响情况是:水泥的水化程度随着龄期的延长而增加,随着粉煤灰量增加先增加后降低。水泥一定的情况下,活性物质水化程度随着龄期的延长而增加,随着粉煤灰量增加而降低。体系的抗压强度随着龄期的延长而增加,随着体系中粉煤灰量的增加后再降低至一定值。

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引用本文

李琴,张春红,陈秋玲,等.不同温度下水泥、粉煤灰再生微粉体系反应程度与抗压强度关系[J].混凝土与水泥制品,2017(3):9-14.

LI Q, ZHANG C H, CHEN Q L,et al.Relationship Between Reaction Degree and Compressive Strength for Cement and Fly Ash Regeneration Powder System under Different Temperatures[J].China Concrete and Cement Products,2017(3):9-14.


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