混凝土
混凝土
혼응토
CONCRETE
2014年
7期
48-51
,共4页
王玲玲%谷亚新%李育霖%姜瑞双%陈肖%陈顺钦%吴飞飞
王玲玲%穀亞新%李育霖%薑瑞雙%陳肖%陳順欽%吳飛飛
왕령령%곡아신%리육림%강서쌍%진초%진순흠%오비비
再生混凝土%纳米CaCO3%纳米SiO2%耐久性
再生混凝土%納米CaCO3%納米SiO2%耐久性
재생혼응토%납미CaCO3%납미SiO2%내구성
recycled concrete%nano-CaCO3%nano-SiO2%durability
通过试验重点研究纳米CaCO3和纳米SiO2对再生混凝土抗冻性和抗硫酸盐侵蚀性的影响。制作100 mm×100 mm×100 mm再生混凝土立方体试件，采用慢冻法测其质量损失和抗压强度损失评价其抗冻性；采用干湿循环试验测其质量损失和抗压强度损失评价其抗硫酸盐侵蚀性。与未强化的再生混凝土相比，经过冻融循环试验，掺15%纳米CaCO3的再生混凝土强度损失下降了59.6%；掺1%纳米SiO2的再生混凝土强度损失下降了73.3%；经过干湿循环试验，掺15%纳米CaCO3的再生混凝土强度损失仅下降了9.7%，而掺1%纳米SiO2的再生混凝土强度损失下降了41.5%。纳米CaCO3和纳米SiO2的掺入均可在一定程度上改善再生混凝土的抗冻性和抗硫酸盐侵蚀性，掺量为1%的纳米SiO2效果更加明显，纳米强化法有利于综合提高再生混凝土的耐久性。
通過試驗重點研究納米CaCO3和納米SiO2對再生混凝土抗凍性和抗硫痠鹽侵蝕性的影響。製作100 mm×100 mm×100 mm再生混凝土立方體試件，採用慢凍法測其質量損失和抗壓彊度損失評價其抗凍性；採用榦濕循環試驗測其質量損失和抗壓彊度損失評價其抗硫痠鹽侵蝕性。與未彊化的再生混凝土相比，經過凍融循環試驗，摻15%納米CaCO3的再生混凝土彊度損失下降瞭59.6%；摻1%納米SiO2的再生混凝土彊度損失下降瞭73.3%；經過榦濕循環試驗，摻15%納米CaCO3的再生混凝土彊度損失僅下降瞭9.7%，而摻1%納米SiO2的再生混凝土彊度損失下降瞭41.5%。納米CaCO3和納米SiO2的摻入均可在一定程度上改善再生混凝土的抗凍性和抗硫痠鹽侵蝕性，摻量為1%的納米SiO2效果更加明顯，納米彊化法有利于綜閤提高再生混凝土的耐久性。
통과시험중점연구납미CaCO3화납미SiO2대재생혼응토항동성화항류산염침식성적영향。제작100 mm×100 mm×100 mm재생혼응토립방체시건，채용만동법측기질량손실화항압강도손실평개기항동성；채용간습순배시험측기질량손실화항압강도손실평개기항류산염침식성。여미강화적재생혼응토상비，경과동융순배시험，참15%납미CaCO3적재생혼응토강도손실하강료59.6%；참1%납미SiO2적재생혼응토강도손실하강료73.3%；경과간습순배시험，참15%납미CaCO3적재생혼응토강도손실부하강료9.7%，이참1%납미SiO2적재생혼응토강도손실하강료41.5%。납미CaCO3화납미SiO2적참입균가재일정정도상개선재생혼응토적항동성화항류산염침식성，참량위1%적납미SiO2효과경가명현，납미강화법유리우종합제고재생혼응토적내구성。
It focused on the frost resistance and the sulfate corrosion resistance of recycled concrete by experiments of adding nano materials such as nano-CaCO3 and nano-SiO2.By making recycled concrete cube specimens with the size of 100 mm×100 mm×100 mm, the study adopted slow-freezing method to evaluate its frost resistance by the indexes of mass loss and strength loss while adopted dry-wet cycles method to evaluate its sulfate corrosion resistance by the indexes of mass loss and strength loss.Compared with the recycled concrete not strengthened,after certain freezing-thawing cycles,the strength loss of the recycled concrete with 15% nano-CaCO3 decreased by 59.6%,and the strength loss of the recycled concrete with 1% nano-SiO2 decreased by 73.3%;after certain drying-wetting cycles,the strength loss of the recycled concrete with 15% nano-CaCO3 reduced only 9.7%,while the strength loss of the recycled concrete with 1% nano-SiO2 decreased by 41.5%.Both nano-CaCO3 and nano-SiO2 can improve the frost resistance and the sulfate corrosion resistance of recycled concrete to some extent.In this study 1% nano-SiO2 possesses more obvious effects.To sum up,nano-strengthening method is beneficial to enhancing the durability of recycled concrete synthetically.
