高抗冻混凝土的研究与应用  

Research and application of high frost-resistance concrete

作　　者：曹四伟[1] 王正中[1] 罗岚 

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]杨凌示范区开发建设有限公司,陕西杨凌712100

出　　处：《西北农林科技大学学报（自然科学版）》2008年第3期223-227,232,共6页Journal of Northwest A&F University(Natural Science Edition)

摘　　要：【目的】研制适用于西北寒冷地区水工高抗冻性混凝土。【方法】配制不同水灰比、外加剂(引气剂,减水剂)掺量和粉煤灰掺量的混凝土,对其进行抗压、抗拉强度和抗冻融试验,分析以上因素对混凝土抗冻性能的影响,以优化水灰比,外加剂和粉煤灰掺量。配制高抗冻混凝土并将其应用于工程实践中,测定其坍落度、含气量、抗压强度和抗冻性,验证该混凝土的实用性。【结果】在水胶比为0.45时,混凝土中加入0.2 g/kg引气剂、5.0 g/kg减水剂和200 g/kg粉煤灰,其28 d抗压强度达到33.8 MPa,抗冻次数300次。经工程实际应用验证,该混凝土实用性满足C30F300高抗冻混凝土要求。【结论】在水胶比为0.45时,向普通混凝土中加入0.2 g/kg引气剂、5.0 g/kg减水剂和200 g/kg粉煤灰,其强度、抗冻耐久性完全能满足高抗冻混凝土要求,适用于西北寒冷地区水电工程建设。【Objective】 This study is to acquire high frost-resistance concrete used in cold northwest areas.【Method】 This paper macroscopically analyzes the capabilities（compressive,tensile strength and frostresisting property） of concrete with different W/C ratios and admixtures.Aiming to acquire high frost-resistance concrete,the research not only optimizes the volume of admixtures and fly ash,but also provides a good mix proportion of high frost-resistance concrete.Through measuring the slump,air content,strength and frost-resistance ability of this concrete,the paper testifies its practicabilities for application in hydraulic engineering.【Result】 The study consequence revealed that,based on the W/C ratio 0.45,added 0.2 g/kg air entraining admixture,5.0 g/kg water reducing admixture and 200 g/kg fly ash,the concrete has good compressive strength capability 33.8 MPa,high frost-resistance ability 300 times.Through testing application of this concrete in hydraulic engineering,the practicabiliyies satisfy the demands of concrete C30F300.【Conclusion】 With the W/C ratio 0.45,adding 0.2 g/kg air entraining admixture,5.0 g/kg water reducing admixture and 200 g/kg fly ash into ordinary concrete,its strength and frost-resistance abilities fully satisfy the requirement of high frost-resistance concrete which is applicable in the construction of hydraulic engineering in northwest cold area.

关 键 词：抗冻混凝土 外加剂 掺量 抗冻耐久性 

分 类 号：TV431.9[水利工程—水工结构工程]