發(fā)布時間：2018-06-20 11:02

  本文選題：表層滲水系數(shù) + 孔結(jié)構(gòu)��； 參考：《功能材料》2014年11期

【摘要】：使用不同配合比的混凝土試件及顆粒標準養(yǎng)護28 d后,浸泡在超純水和5%的NaCl溶液中,采用表面滲透性測試儀(Autoclam)和氮氣吸附法定期檢測混凝土的表層滲水系數(shù)及微觀孔結(jié)構(gòu),研究氯離子對混凝土表層滲水性能及水泥水化漿體微觀結(jié)構(gòu)的影響。結(jié)果表明,NaCl溶液浸泡會顯著提高混凝土表層的抗?jié)B能力,對PC1混凝土,浸泡90 d后,表層滲水系數(shù)為超純水浸泡試件的0.91,150 d后僅為超純水試件的0.76;氯離子浸入混凝土后,會使混凝土的孔結(jié)構(gòu)細化,顯著降低100 nm以下的小孔,實驗中,PC1混凝土在NaCl溶液浸泡后,小于100 nm的孔與超純水浸泡相比減少了32.43%;PC2混凝土在NaCl溶液浸泡后,小于100 nm的孔相比減少了57.24%;NaCl溶液浸泡下,水泥水化良好,結(jié)構(gòu)較致密,氯離子對水泥漿體的水化過程有一定的促進作用。
[Abstract]:After 28 days of standard curing of concrete specimens and particles with different mix ratios, the concrete samples were immersed in ultra-pure water and 5% NaCl solution. The surface permeability test instrument Autoclamp) and nitrogen adsorption method were used to regularly detect the surface water permeability coefficient and microstructure of concrete. The effect of chloride ion on the surface water permeability of concrete and the microstructure of cement hydrated slurry was studied. The results show that the impermeability of concrete surface layer can be improved significantly by soaking in NaCl solution. For PC1 concrete, after 90 days of immersion, the surface water permeability coefficient of PC1 concrete is only 0.76 of that of ultra-pure water sample after 0.91150 days of soaking in ultra-pure water, and that of concrete immersed in chloride ion is only 0.76. The pore structure of concrete will be refined, and the pore size below 100 nm will be significantly reduced. In the experiment, after immersion in NaCl solution, the pore less than 100 nm will reduce 32.43% PC2 concrete after immersion in NaCl solution, compared with ultra-pure water immersion. When the pore size less than 100 nm is reduced by 57.24% NaCl solution, the hydration of cement is good and the structure is compact. Chloride ions can promote the hydration process of cement paste to some extent.
【作者單位】： 深圳大學土木工程學院 廣東省濱海土木工程耐久性重點實驗室;
【基金】：國家自然科學基金青年基金資助項目(51108271) 國家重點基礎研究發(fā)展計劃(973計劃)資助項目(2011CB013604) 深圳市科技計劃資助項目(JCYJ20120613115622154)
【分類號】：TU528

【共引文獻】

相關期刊論文 前10條

1 羅明勇;曾強;龐曉，

本文編號：2044038