發(fā)布時(shí)間：2018-04-15 15:43

  本文選題：水蒸氣等溫吸附 + 吸附平衡　； 參考：《硅酸鹽學(xué)報(bào)》2015年05期

【摘要】：分別采用水膠比為0.3、0.4和0.5的凈漿和砂漿,結(jié)合文獻(xiàn)模型對(duì)水泥基材料中水蒸氣的等溫吸附(脫附)平衡和動(dòng)力學(xué)過(guò)程進(jìn)行了擬合和參數(shù)分析。結(jié)果表明:多層吸附的Guggenheim-Andersen-de Boer(GAB)模型能夠更好地描述水泥基材料中水蒸氣的吸附(脫附)平衡以及吸附-脫附滯回,吸附過(guò)程的第1層吸附能常數(shù)大于脫附過(guò)程的,但單層吸附量小于脫附過(guò)程的,吸附-脫附滯回在相對(duì)濕度為65%~70%時(shí)最大;二階模型最能夠描述水泥基材料中水蒸氣的吸附(脫附)動(dòng)力學(xué)過(guò)程,二階模型中的初始吸附速率要明顯低于初始脫附速率,兩者均隨相對(duì)濕度的增大而顯著增加;速率常數(shù)在吸附過(guò)程中隨相對(duì)濕度減小而增大,在脫附過(guò)程中則隨相對(duì)濕度減小而減小。
[Abstract]:The isothermal adsorption (desorption) equilibrium and kinetic process of water vapor in cement based materials were simulated and analyzed by using clean mortar and mortar with water / binder ratio of 0.3 ~ 0. 4 and 0. 5 respectively.The results show that the multi-layer adsorption Guggenheim-Andersen-de model can better describe the adsorption (desorption) equilibrium of water vapor and the adsorption-desorption hysteresis in cement-based materials. The adsorption energy constant of the first layer of adsorption process is larger than that of desorption process.However, if the adsorption capacity of monolayer is smaller than that of desorption, the adsorption-desorption hysteresis is the largest at the relative humidity of 65 ~ 70, and the second order model can best describe the adsorption (desorption) kinetic process of water vapor in cement based materials.In the second order model, the initial adsorption rate is obviously lower than the initial desorption rate, and both of them increase significantly with the increase of relative humidity, and the rate constant increases with the decrease of relative humidity during the adsorption process.The desorption process decreases with the decrease of relative humidity.
【作者單位】： 教育部土木工程安全與耐久重點(diǎn)實(shí)驗(yàn)室 清華大學(xué)土木工程系;
【基金】：國(guó)家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃(2009CB623106) 自然科學(xué)基金項(xiàng)目(51378295)資助項(xiàng)目
【分類號(hào)】：TU528

【參考文獻(xiàn)】

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本文編號(hào)：1754748