發(fā)布時間：2018-05-03 14:54

  本文選題：水泥基材料 + 裂紋網(wǎng)絡(luò)��； 參考：《硅酸鹽學(xué)報》2015年08期

【摘要】：為了研究裂紋網(wǎng)絡(luò)對水泥基材料滲透性的影響,采用人工制造裂紋再拼接的方法得到不同開裂程度的薄片試件,對開裂試件表面的二維裂紋形貌特征進(jìn)行了定量分析,包括裂紋的密度、取向、裂紋寬度等。測試了普通混凝土和砂漿材料的等溫吸附與脫附曲線,得到兩種材料的水分特征曲線。并用水分遷移的多相流模型模擬試件的干燥過程,同時對比干燥實驗中不同開裂程度試件的質(zhì)量變化以回歸其對應(yīng)的本征滲透系數(shù)。結(jié)果表明:裂紋密度大于臨界閾值0.3時,相對滲透系數(shù)增加迅速;滲透系數(shù)與裂紋的寬度成指數(shù)關(guān)系,指數(shù)為1.945,接近立方定律中滲透系數(shù)與寬度的二次方關(guān)系。
[Abstract]:In order to study the effect of crack network on the permeability of cement based materials, the thin specimens with different degree of cracking were obtained by using the method of artificial crack splicing, and the characteristics of two-dimensional crack morphology on the surface of cracked specimens were quantitatively analyzed. Including crack density, orientation, crack width and so on. The isothermal adsorption and desorption curves of ordinary concrete and mortar were measured and the water characteristic curves of the two materials were obtained. The drying process of the specimens was simulated by using a multi-phase flow model of water migration, and the corresponding intrinsic permeability coefficients were regressed by comparing the mass changes of specimens with different cracking degrees in drying experiments. The results show that when the crack density is greater than the critical threshold 0.3, the relative permeability coefficient increases rapidly, and the permeability coefficient is exponentially related to the crack width, the exponent is 1.945, which is close to the quadratic relation between the permeability coefficient and the width in the cubic law.
【作者單位】： 教育部土木工程安全與耐久重點實驗室清華大學(xué)土木工程系;
【分類號】：TU528

【共引文獻(xiàn)】

相關(guān)期刊論文 前10條

1 何文敏;張學(xué)鋼;王闖;;BFRC中玄武巖纖維的分散性與膠砂流動性[J];材料導(dǎo)報;2013年08期

2 羅明勇;曾強;龐曉，

本文編號：1838956