Natural and accelerated CO2 binding kinetics in cement paste at different relative humidities
Natural and accelerated CO2 binding kinetics in cement paste at different relative humidities
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DOI：
10.1016/j.cemconres.2013.03.009
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发表时间：
2013-07-01
影响因子：
11.4
通讯作者：
Castellote, Marta
中科院分区：
文献类型：
--
作者：
Galan, Isabel;Andrade, Carmen;Castellote, Marta
从CO2结合的角度对自然碳化和加速碳化进行了比较。热重分析，中子衍射和重量测量被用来量化暴露于不同的CO2和相对湿度（RH）条件下的样品中的CO2的量。提出了一个指数方程来描述时间演化：自然和加速过程的组合率和最大值。分析了RH对这些参数的影响。在100%CO2时，相对湿度从53%增加到75%会大大降低结合率，但会略微增加最大CO2结合率。在0.5%CO2的速率和最大值都较高的中间RH，与两个变量之间的线性关系。已经计算了不同过程之间的等效性：在100%CO2和65%RH碳酸化条件下，1小时内结合的CO2量相当于约36天的室外自然暴露和54天的室内暴露。(c)2013爱思唯尔有限公司保留所有权利。
Natural carbonation and accelerated carbonation are compared in terms of CO2 combination. Thermogravimetrical analysis, neutron diffraction and weight measurements were used to quantify the amounts of CO2 in samples exposed to different CO2 and relative humidity (RH) conditions. An exponential equation is proposed to describe temporal evolution: combination rates and maximum values are obtained both for natural and accelerated processes. The influence of RH in these parameters is analyzed. At 100% CO2 an increase of RH from 53 to 75% diminishes the combination rate considerably, but increases slightly the maximum CO2 binding. At 0.5% CO2 both the rate and the maximum are higher for intermediate RH, with a linear relation between both variables. Equivalences between the different processes have been calculated: the amount of CO2 combined in 1 h at 100% CO2 and 65% RH carbonation is equivalent to approximately 36 days of natural exposure outside and 54 days inside. (c) 2013 Elsevier Ltd. All rights reserved.