铁尾矿砂水泥混凝土性能研究
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摘要
为了研究铁尾矿砂对混凝土和易性和力学性能的影响,采用坍落度试验和抗折、抗压试验结果分析了不同种类、不同比例的外掺剂对铁尾矿混凝土性能的影响。结果表明:1)铁尾矿砂对混凝土和易性影响较大,其抗折、抗压强度在铁尾矿砂掺入量25%时达到最佳; 2)以25%铁尾矿砂为标准组,对不同外掺剂进行配合比设计,研究在铁尾矿砂基础上外掺剂对混凝土性能的影响。以粉煤灰取代水泥,随着掺量增多,7 d强度降低,90 d强度增加;以硅灰代替水泥,随着掺量增多,坍落度先增加再降低,强度增大;以矿渣代替水泥,随着掺量增多,流动性变好,强度增大。
In order to study the influence of iron tailings on the workability and mechanical properties of concrete,the results of the slump test and the flexural and compressive test were used to analyze the effects of different kinds and proportions of admixtures on the performance of iron tailings concrete. The results show that iron tailings have a great influence on concrete workability,and its flexural and compressive strength reaches the optimum when the iron tailings content is 25%.,Taking 25% iron tailings as standard group,the mix proportion of different admixtures was designed to study the influence of admixtures on concrete performance based on iron tailings.When fly ash is used instead of cement,the strength decreases in 7 d and increases in 90 d with the increase of cement content; when silica fume is used instead of cement,the slump first increases and then decreases,and the strength increases. When slag is used instead of cement,the fluidity becomes better and the strength increases with the increase of slag content.
In order to study the influence of iron tailings on the workability and mechanical properties of concrete,the results of the slump test and the flexural and compressive test were used to analyze the effects of different kinds and proportions of admixtures on the performance of iron tailings concrete. The results show that iron tailings have a great influence on concrete workability,and its flexural and compressive strength reaches the optimum when the iron tailings content is 25%.,Taking 25% iron tailings as standard group,the mix proportion of different admixtures was designed to study the influence of admixtures on concrete performance based on iron tailings.When fly ash is used instead of cement,the strength decreases in 7 d and increases in 90 d with the increase of cement content; when silica fume is used instead of cement,the slump first increases and then decreases,and the strength increases. When slag is used instead of cement,the fluidity becomes better and the strength increases with the increase of slag content.
引文
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[15]李涛,党斌,李传博,等.性能增强铁尾矿砂混凝土抗压性能试验研究[J].建筑技术,2017,48(1):58-61.LI Tao,DANG Bin,LI Chuanbo,et al. Experimental study on compressive strength with performance enhancement of iron tailing concrete[J]. Architecture Technology,2017,48(1):58-61.
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[2]张玉琢,马洁,刘海卿.铁尾矿砂混凝土路用性能试验研究[J].混凝土,2018,12:157-160.ZHANG Yuzhuo, MA Jie, LIU Haiqing, et al.Experimental research on iron tailings as concrete fine aggregate in highway[J]. Concrete,2018,12:157-160.
[3]何兆芳,崔逊斌,汪涛,等.铁尾矿在C60混凝土中的应用研究[J].混凝土,2011(12):142-144.HE Zhaofang,CUI Xunbin,WANG Tao,et al. Iron gangue's application research in C60 concrete[J].Concrete,2011(12):142-144.
[4]王玉雅,韩守杰,韩欣,等.铁尾矿砂对C50混凝土力学性能的影响[J].新型建筑材料,2018,45(8):108-110.WANG Yuya,HAN Shoujie,HAN Xin,et al. Influence of iron tailings on mechanical properties of C50 concrete[J]. New Building Materials,2008,45(8):108-110.
[5]张玉琢,周梅,刘凯.铁尾矿砂用于混凝土细集料的试验研究[J].非金属矿,2016,39(6):57-66.ZHANG Yuzhuo,ZHOU Mei,LIU Kai. Experimental research on iron tailings as concrete fine aggregate[J].Non-Metallic Mines,2016,39(6):57-66.
[6]马卫华,康洪震.铁尾矿砂混凝土抗剪强度试验与分析[J].山西建筑,2019,45(8):93-94.MA Weihua,KANG Hongzhen. Shear strength test and analysis of iron tailing concrete[J]. Shanxi Architecture,2019,45(8):93-94.
[7]崔鑫,李俞凛,杜华瑞.铁尾矿砂及其综合利用技术研究[J].商品混凝土,2017(5):52-54.CUI Xin,LI Yulin,DU Huarui. Research on iron tailings and its comprehensive utilization technology[J]. ReadyMixed Concrete,2017(5):52-54.
[8]张文慧.铁尾矿砂在水泥生产中的应用[J].中国水泥,2017(4):85-86.ZHANG Wenhui. Application of iron tailings in cement production[J]. China Cement,2017(4):85-86.
[9]鲍文博,张少峰.混合细骨料水泥基复合材料铁尾矿砂替代比例的研究[J].混凝土与水泥制品,2013(6):81-83.BAO Wenbo,ZHANG Shaofeng. Study on replacement ratio of iron tailings of composite materials with fine aggregate cement[J]. China Concrete and Cement Products,2013(6):81-83.
[10]冯永存,宋少民.铁尾矿微粉复合矿物掺合料的试验研究[J].粉煤灰综合利用,2015(1):44-45,47.FENG Yongcun,SONG Shaomin. Experimental study on iron tailings powder as concrete admixture[J]. Fly Ash Comprehensive Utilization,2015(1):44-45,47.
[11]曾维,李北星,陈梦义,等.铁尾矿基复合掺合料混凝土性能的研究[J].混凝土,2015(10):78-81,86.ZENG Wei,LI Beixing,CHEN Mengyi,et al. Properties of concrete prepared from iron tailings based composite admixture[J]. Concrete,2015(10):78-81,86.
[12]陈海洋,孙婧,白启敬,等.矿物外加剂对铁尾矿砂活性粉末混凝土性能的影响研究[J].河北建筑工程学院学报,2018,36(1):22-27.CHEN Haiyang,SUN Jing,BAI Qijing,et al. Effect of mineral admixtures on the properties of reactive powder concrete of iron tailings sand[J]. Journal of Hebei Institute of Architecture and Civil Engineering,2008,36(1):22-27.
[13]赵黔义.二灰稳定铁尾矿渣混合料用于道路基层的试验研究[J].公路交通技术,2014(1):7-10.ZHAO Qianyi. Experimental research on application of lime-flyash stable iron tail slag mixture on roadbase[J].Technology of Highway and Transport,2014(1):7-10.
[14]肖燕.环氧砂浆胶结料含量对水泥混凝土修补效果的影响[J].公路交通技术,2015(5):22-25.XIAO Yan. Influences of content of epoxy resin cementing material on repair efficiency of cement concrete[J].Technology of Highway and Transport,2015(5):22-25.
[15]李涛,党斌,李传博,等.性能增强铁尾矿砂混凝土抗压性能试验研究[J].建筑技术,2017,48(1):58-61.LI Tao,DANG Bin,LI Chuanbo,et al. Experimental study on compressive strength with performance enhancement of iron tailing concrete[J]. Architecture Technology,2017,48(1):58-61.
[16]张伟,刘梁友,李莉丽,等.铁尾矿粉-粉煤灰-矿渣粉复合掺合料对混凝土性能的影响[J].硅酸盐通报,2016,35(11):3826-3831.ZHANG Wei,LIU Liangyou,LI Lili,et al. Influence of iron tailings slag-fly ash-slag powder composite admixture on the properties of concrete[J]. Bulletin of the Chinese Ceramic Society,2016,35(11):3826-3831.