山体隧道洞渣碱活性评定及碱骨料反应抑制措施研究  

Study on alkali activity evaluation of mountain tunnel slag and inhibition measures of alkali-aggregate reaction

作　　者：万桂军 刘凯 刘忠凯 穆松 何勇顺 谢德擎 WAN Guijun;LIU Kai;LIU Zhongkai;MU Song;HE Yongshun;XIE Deqing(China Overseas Construction Limited,Shenzhen 518000,China;Guizhou Leirong Expressway Investment Management Co.Ltd.,Guizhou Qiandongnan Miao and Dong Autonomous Prefecture 556000,China;Jiangsu Sobute New Materials Co.Ltd,State Key Laboratory of High Performance Civil Engineering Material,Nanjing 211103,China)

机构地区：[1]中海建筑有限公司,广东深圳518000 [2]贵州雷榕高速公路投资管理有限公司,贵州黔东南苗族侗族自治州556000 [3]江苏苏博特新材料股份有限公司,高性能土木工程材料国家重点实验室,江苏南京211103

出　　处：《新型建筑材料》2024年第4期77-81,105,共6页New Building Materials

基　　金：中海建筑有限公司科研项目(GZ-KL-005/DSC/X069)。

摘　　要：对某高速隧道洞渣进行了碱活性判定,从密实性和疏水性方面提出了碱骨料反应抑制措施,并通过膨胀率、强度综合评价抑制效果,从吸水率、孔溶液中碱含量探究了抑制机理。结果表明:洞渣骨料属于高活性碱-硅酸骨料,存在碱骨料反应风险;控制粉煤灰掺量不低于30%可有效抑制洞渣碱骨料反应;采用10%~12%的RMA纳米防腐剂或2.5%~7.5%的TIA抗侵蚀抑制剂优化单掺30%粉煤灰可以兼具强度保障和碱骨料反应抑制;单掺粉煤灰、复掺粉煤灰和RMA纳米防腐剂主要通过降低孔溶液中游离态的碱离子,实现碱骨料反应的抑制;复掺粉煤灰和TIA抗侵蚀抑制剂主要通过碱离子和吸水率的双重降低,实现碱骨料反应的抑制。In this paper,the alkali activity of a high-speed tunnel slag is determined,and the inhibition measures of alkali-aggregate reaction are put forward from two aspects of compactness and hydrophobicity,and the inhibition effect is comprehensively evaluated by expansion rate and strength.the inhibition mechanism was explored from water absorption and alkali content in pore solution.The results show that cave slag aggregate belongs to high alkali activity-silicate aggregate,which has the risk of alkali aggregate reaction;controlling fly ash not less than 30%can effectively restrain the alkali aggregate reaction of cave slag;using 10%~12%RMA nano-preservative or 2.5%~7.5%TIA anti-corrosion inhibitor to optimize 30%fly ash can have both strength guarantee and alkali aggregate reaction inhibition.Single addition of fly ash,double addition of fly ash and nano-preservative RMA can inhibit alkali-aggregate reaction mainly by reducing the free alkali ions in pore solution,while double-mixing fly ash and TIA anti-corrosion inhibitor can inhibit alkali-aggregate reaction mainly by reducing alkali ion and water absorption.

关 键 词：隧道洞渣 碱骨料反应 膨胀率 强度 疏水 孔溶液 

分 类 号：TU528.041[建筑科学—建筑技术科学]