铁尾矿砂砂浆力学性能和收缩性能研究
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摘要
测试了铁尾矿砂的颗粒级配、细度模数、石粉含量及密度等基本性能,用铁尾矿砂取代不同量的天然砂制备砂浆,研究其对砂浆工作性能、力学性能、吸水性能及收缩性能的影响。实验结果表明:铁尾矿砂砂浆减水剂饱和掺量点与天然砂砂浆相同,铁尾矿砂砂浆流动度经时损失速度大于天然砂砂浆;铁尾矿砂的掺入会降低砂浆的流动性,增加砂浆的表观密度,提高砂浆的抗折强度与抗压强度,随着铁尾矿砂取代量增大,砂浆不同龄期的干燥收缩率显著增大。
The basic properties of iron tailing sand,including the particle size distribution,fineness modulus,stone powder content and density were tested. The mortar was prepared by replacing different amounts of natural sand with iron tailing sand,and the effect of iron tailing sand on the workability,mechanical property, water absorption capability and drying shrinkage property of mortar was investigated. The results show that the saturated dosage of superplasticizer of mortar with iron tailing sand is the same as that of mortar with natural sand,and the flowability-loss of mortar with iron tailing sand is greater than that of mortar with natural sand; the incorporation of iron tailing sand will increase the apparent density,the flexural and compressive strength of mortar,while reduce the flowability. With the increase of iron tailing sand replacement,the drying shrinkage of mortar at different ages increases significantly.
The basic properties of iron tailing sand,including the particle size distribution,fineness modulus,stone powder content and density were tested. The mortar was prepared by replacing different amounts of natural sand with iron tailing sand,and the effect of iron tailing sand on the workability,mechanical property, water absorption capability and drying shrinkage property of mortar was investigated. The results show that the saturated dosage of superplasticizer of mortar with iron tailing sand is the same as that of mortar with natural sand,and the flowability-loss of mortar with iron tailing sand is greater than that of mortar with natural sand; the incorporation of iron tailing sand will increase the apparent density,the flexural and compressive strength of mortar,while reduce the flowability. With the increase of iron tailing sand replacement,the drying shrinkage of mortar at different ages increases significantly.
引文
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[14]刘春苹,季韬,周丰,等.机制砂取代率及石粉掺量对人工砂砂浆流动度与力学性能的影响[J].福州大学学报:自然科学版,2014,42(1):128-132.
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[2]Shettima A U,Hussin M W,Ahmad Y,et al.Evaluation of iron ore tailings as replacement for fine aggregate in concrete[J].Construction&Building Materials,2016,120:72-79.
[3]Zhao S,Fan J,Sun W.Utilization of iron ore tailings as fine aggregate in ultra-high performance concrete[J].Construction&Building Materials,2014,50(2):540-548.
[4]李晓光,景帅帅,马玉平.铁尾矿建筑砂浆的应用特性研究[J].混凝土与水泥制品,2014(8):89-93.
[5]Fontes W C,Mendes J C,Silva S N D,et al.Mortars for laying and coating produced with iron ore tailings from tailing dams[J].Construction&Building Materials,2016,112:988-995.
[6]朱志刚,李北星,周明凯,等.铁尾矿砂应用于混凝土的可行性研究[J].武汉理工大学学报(交通科学与工程版),2016,40(3):428-431.
[7]Chandra S,Bj9rnstr9m J.Influence of cement and superplasticizers type and dosage on the fluidity of cement mortars-Part I[J].Cement&Concrete Research,2002,32(10):1605-1611.
[8]徐永模,彭杰,赵昕南.评价减水剂性能的新方法---砂浆坍落扩展度[J].硅酸盐学报,2002,30(s1):124-130.
[9]徐海军,文梓芸.超塑化剂与水泥相容性测定方法应用技术研究[J].水泥,2004(10):12-14.
[10]刘慈军,吴朝晖,温小栋,等.凝灰岩机制砂与聚羧酸减水剂的适应性试验研究[J].宁波工程学院学报,2015,27(1):1-5.
[11]蔡基伟.石粉对机制砂混凝土性能的影响及机理研究[D].武汉:武汉理工大学,2006.
[12]王稷良.机制砂特性对混凝土性能的影响及机理研究[D].武汉:武汉理工大学,2008.
[13]李晓光,景帅帅,马玉平.铁尾矿水泥砂浆的力学性能及孔结构特征[J].混凝土,2014(6):124-128.
[14]刘春苹,季韬,周丰,等.机制砂取代率及石粉掺量对人工砂砂浆流动度与力学性能的影响[J].福州大学学报:自然科学版,2014,42(1):128-132.
[15]周爱军,周红.机制砂在普通砂浆中应用试验研究[J].硅酸盐通报,2016,35(1):310-315.
[16]赵顺波,王磊,梁娜.石粉含量对机制砂水泥砂浆力学性能的影响[J].混凝土,2014(4):130-132.
[17]王稷良,周明凯,朱立德,等.机制砂对高强混凝土体积稳定性的影响[J].武汉理工大学学报,2007,29(10):20-24.