本文選題：鹽漬土　切入點：混凝土　出處：《長江科學(xué)院院報》2017年05期

【摘要】：通過實地調(diào)研發(fā)現(xiàn),新疆南疆鹽漬土地區(qū)許多混凝土建(構(gòu))筑物均不同程度地存在由鹽蝕-凍融引起的混凝土表面剝蝕、開裂和疏松、粗骨料大面積裸露、鹽結(jié)晶析出等病害。引起該地區(qū)混凝土產(chǎn)生鹽蝕-凍融病害的主要原因有3個方面:(1)混凝土表層和內(nèi)部的孔隙水凍結(jié)產(chǎn)生的拉應(yīng)力;(2)滲入混凝土內(nèi)部的鹽類結(jié)晶產(chǎn)生的拉應(yīng)力;(3)硫酸鹽與水泥水化產(chǎn)物發(fā)生化學(xué)反應(yīng)產(chǎn)生的拉應(yīng)力。這些因素綜合作用造成混凝土由表及里逐漸損傷、破壞和解體。通過調(diào)整混凝土水膠比、優(yōu)化含氣量和攪拌時間、優(yōu)選骨料、使用抗硫酸鹽水泥、增厚混凝土表面瀝青膠泥防腐涂層厚度等工程措施,可有效提升南疆鹽漬土地區(qū)混凝土結(jié)構(gòu)抵抗鹽蝕和凍融破壞的能力。
[Abstract]:Through field investigation, it is found that many concrete structures in the saline soil area of southern Xinjiang exist, in varying degrees, the surface erosion, cracking and loosening of concrete caused by salt corrosion and freeze-thaw, and extensive exposure of coarse aggregate. The main causes of salt corrosion-freeze-thaw disease of concrete in this area are three aspects: 1) tensile stress caused by freezing pore water in surface and interior of concrete) salt crystallization infiltrating into concrete interior. The tensile stress caused by the chemical reaction between the sulfate and the hydration product of cement caused by the combined action of these factors resulted in the gradual damage of concrete from the outside to the inside. By adjusting the water / binder ratio of concrete, optimizing air content and stirring time, selecting aggregates, using sulphate resistant cement, increasing the thickness of asphalt cement coating on concrete surface, etc. It can effectively enhance the ability of resisting salt corrosion and freeze-thaw damage of concrete structure in saline soil area of southern Xinjiang.
【作者單位】： 塔里木大學(xué)水利與建筑工程學(xué)院;武漢大學(xué)土木建筑工程學(xué)院;第一師阿拉爾市建筑材料檢測中心;
【基金】：兵團應(yīng)用基礎(chǔ)研究計劃項目(2016AG017) 塔里木大學(xué)校長基金重大培育項目(TDZKPY201401);塔里木大學(xué)校長基金青年項目(TDZKQN201612)
【分類號】：TU528
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本文編號：1699126