本文選題：熱帶海洋環(huán)境 + 普通混凝土��； 參考：《哈爾濱工程大學學報》2016年08期

【摘要】：為了探究熱帶海洋環(huán)境下混凝土結構的耐久性,通過對我國南海島礁普通混凝土結構的現(xiàn)場調研與測試,研究了普通混凝土的破壞現(xiàn)狀、碳化深度、自由氯離子含量(C_f)和總氯離子含量(C_t),并計算了氯離子結合能力(R)、表面自由氯離子含量(C_s)、表觀氯離子擴散系數(shù)(D_a)和自由氯離子擴散系數(shù)(D_f)。結果表明:在南海島礁工程中,普通混凝土結構的主要破壞特征為混凝土保護層脹裂、剝落、垮塌、露筋、鋼筋銹蝕等;其碳化服役壽命不足25a;海風是加速氯離子擴散滲透的主要因素之一;普通混凝土在南海島礁環(huán)境下的D_a值大于北歐、北美及我國東海等近海環(huán)境,大致高1~2個數(shù)量級。
[Abstract]:In order to explore the durability of concrete structures in tropical marine environment, the present situation of concrete destruction and carbonation depth were studied by field investigation and test of ordinary concrete structures on islands and reefs in the South China Sea. The free chloride ion content and the total chlorine ion content are calculated. The free chloride ion binding capacity and the surface free chloride ion content are calculated. The apparent chloride ion diffusion coefficient is Dia and the free chloride ion diffusion coefficient is DfN. The results show that the main failure characteristics of ordinary concrete structures in the South China Sea islands and reefs project are expansion and crack of concrete cover, spalling, collapse, exposed reinforcement, corrosion of steel bars and so on. The carbonation service life is less than 25a, the sea breeze is one of the main factors to accelerate the chloride ion diffusion and permeation, and the D _ a value of ordinary concrete in the South China Sea island and reef environment is larger than that in Northern Europe, North America and China's East China Sea and so on, which is about 1 ~ 2 orders of magnitude higher.
【作者單位】： 南京航空航天大學土木工程系;解放軍理工大學爆炸沖擊防災減災國家重點實驗室;海軍海防工程研究中心;中國人民解放軍92003部隊;
【基金】：國家自然科學基金項目(51508272) 國家重點基礎研究發(fā)展計劃資助項目(2015CB655102) 江蘇省普通高校研究生科研創(chuàng)新計劃項目(KYLX15-0230)
【分類號】：TU528
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本文編號：2022658