【摘要】：隨著我國(guó)城市化進(jìn)程和基礎(chǔ)建設(shè)的加快，混凝土耐久性問(wèn)題也越來(lái)越得到人們的重視。本文依托于國(guó)家科技支撐計(jì)劃項(xiàng)目-跨海集群工程混凝土結(jié)構(gòu)120年使用壽命保障關(guān)鍵技術(shù)，研究了無(wú)損檢測(cè)技術(shù)在混凝土耐久性質(zhì)量控制方面的應(yīng)用。根據(jù)FICK第二定律可知，氯離子擴(kuò)散系數(shù)與鋼筋保護(hù)層厚度對(duì)混凝土結(jié)構(gòu)使用年限有著非常重要的影響。因此，本文重點(diǎn)研究了利用WENNER、探地雷達(dá)等無(wú)損檢測(cè)技術(shù)方法對(duì)混凝土耐久性質(zhì)量進(jìn)行控制的應(yīng)用，具體研究成果如下 1、通過(guò)開(kāi)展現(xiàn)場(chǎng)試驗(yàn)、足尺模型與室內(nèi)試驗(yàn)，建立WENNER法與RCM法兩種試驗(yàn)方法所測(cè)得的混凝土電阻率與混凝土氯離子擴(kuò)散系數(shù)的相關(guān)性。試驗(yàn)表明，足尺模型試驗(yàn)測(cè)得電阻率隨齡期變化規(guī)律更加符合實(shí)體構(gòu)件的電阻率隨齡期變化規(guī)律，，混凝土電阻率ρ與混凝土氯離子擴(kuò)散系數(shù)D的關(guān)系式為D=128.486。通過(guò)試驗(yàn)建立了實(shí)體構(gòu)件混凝土電阻率ρ與氯離子擴(kuò)散系數(shù)D的關(guān)系式D=128.4861.02ρ3.05，解決了現(xiàn)場(chǎng)構(gòu)件無(wú)法進(jìn)行破損性的氯離子擴(kuò)散系數(shù)檢測(cè)這一問(wèn)題，實(shí)現(xiàn)了現(xiàn)場(chǎng)簡(jiǎn)單快速的控制混凝土耐久性質(zhì)量的目標(biāo)。 2、通過(guò)開(kāi)展港珠澳大橋沉管隧道足尺模型試驗(yàn)確定了探地雷達(dá)測(cè)混凝土保護(hù)層厚度的偏差修正值為0.87mm。使用探地雷達(dá)對(duì)港珠澳大橋沉管隧道預(yù)制構(gòu)件的10個(gè)管節(jié)共計(jì)64個(gè)節(jié)段的5600多根鋼筋位置的混凝土保護(hù)層厚度進(jìn)行了檢測(cè)，分析總結(jié)了沉管隧道預(yù)制構(gòu)件墻外側(cè)、墻內(nèi)側(cè)、底板外側(cè)的保護(hù)層厚度的偏差分布，達(dá)到了精準(zhǔn)控制混凝土耐久性質(zhì)量的要求。 3、對(duì)比分析了沉管隧道預(yù)制構(gòu)件墻外側(cè)、墻內(nèi)側(cè)、底板外側(cè)保護(hù)層厚度偏差分布的差異。沉管隧道預(yù)制構(gòu)件底板外側(cè)保護(hù)層厚度偏差比墻外側(cè)、墻內(nèi)側(cè)的偏差都小，因此要加強(qiáng)沉管隧道預(yù)制構(gòu)件墻外側(cè)、墻內(nèi)側(cè)綁扎鋼筋、模板支護(hù)時(shí)的質(zhì)量監(jiān)測(cè)。
[Abstract]:With the acceleration of urbanization and infrastructure in China, the durability of concrete has been paid more and more attention. Based on the key technology of 120 years service life guarantee of concrete structure in cross-sea cluster project, the application of nondestructive testing technology in durability quality control of concrete is studied in this paper. According to FICK's second law, the chloride diffusion coefficient and the thickness of steel bar cover have a very important influence on the service life of concrete structures. Therefore, this paper focuses on the application of WENNER, ground penetrating radar and other nondestructive testing techniques to control the durability quality of concrete. The specific research results are as follows: 1. Through field test, full-scale model and laboratory test, The correlation between the concrete resistivity measured by the WENNER method and the RCM method and the chloride diffusion coefficient of the concrete is established. The test results show that the variation of resistance with age is more in accordance with the law of resistance of solid members with age, and the relationship between resistance of concrete and chloride diffusion coefficient D of concrete is D 鈮

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