钢渣粉-偏高岭土再生混凝土力学性能及微观结构的研究

刘业金; 周长顺

doi:10.13204/j.gyjzG21062503

钢渣粉-偏高岭土再生混凝土力学性能及微观结构的研究

doi: 10.13204/j.gyjzG21062503

刘业金¹,
周长顺^2,3, ,

1. 绍兴职业技术学院建筑与设计艺术学院, 浙江绍兴 312000;
2. 绍兴文理学院元培学院, 浙江绍兴 312000;
3. 中南大学土木工程学院, 长沙 430100

基金项目:

国家自然科学基金项目(41572305)。

详细信息

作者简介:
刘业金,男,1982年出生,硕士。

通讯作者:
周长顺,男,1982年出生,博士,changshun0121@163.com。

计量
- 文章访问数: 80
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- PDF下载量: 0
- 被引次数: 0
出版历程
- 收稿日期: 2021-06-25
- 网络出版日期: 2022-06-30
- 刊出日期: 2022-02-20

Study on Mechanical Properties and Microstructure of Recycled Aggregate Concrete Containing Steel Slag Powder and Metakaolin

LIU Yejin¹,
ZHOU Changshun^{2,3
, ,}

1. College of Architecture and Design Art, Shaoxing Vocational and Technical University, Shaoxing 312000, China;
2. Yuanpei College, Shaoxing University, Shaoxing 312000, China;
3. Civil Engineering College, Central South University, Changsha 430100, China

摘要

摘要: 为了提高钢渣粉(SSP)作为矿物添加剂在水泥基材料中的利用率,以及增强再生混凝土(RAC)的力学性能,探究了SSP和偏高岭土(MK)复掺对RAC力学性能和微观结构的影响。试验结果表明:当MK占矿物添加剂30%的质量分数时,试样第28、90天的抗压强度较基准组分别提高了13.3%和18%,弹性模量的变化趋势与抗压强度相似。微观测试表明,SSP和MK复掺降低了Ca(OH)₂的峰值强度,并且生成更多额外的C-S-H凝胶以及提高了高密度C-S-H在C-S-H中的百分比,使RAC后期的微观结构和界面过渡区得到显著改善,这归因于SSP和MK复掺表现出更好的火山灰活性和微集料填充效应。
- 再生混凝土 /
- 偏高岭土 /
- 钢渣粉 /
- 力学性能 /
- 微观结构
Abstract: To improve the utilization rate of steel slag powder (SSP) as mineral admixture in cement-based materials, and to enhance the mechanical properties of recycled aggregate concrete (RAC), the influences of SSP and MK on the mechanical properties and microstructure of RAC were studied. The mechanical test results showed that the compressive strength of the mineral admixture at 28 d and 90 d was respectively increased by 13.3% and 18% as the mass fraction of MK in mineral admixture was 30%, compared with that of the reference group, and the changing trend of elastic modulus was similar to that of the compressive strength. Microstructural tests indicated that SSP and MK mixed with Ca(OH)₂ decreased the peak strength, generated additional C-S-H gel and increased the percentage of high density C-S-H, which significantly improved the microstructure and interfacial transition zone of RAC in the later stage. These were attributed to the better volcanic ash activity and micro-aggregate filling effect of SSP and MK mixed mixture.
- recycled aggregate concrete /
- metakaolin /
- steel slag powder /
- mechanical properties /
- microstructure

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参考文献(24)

[1]	张明明,王社良,张世民,等.矿物掺合料对再生混凝土力学性能的影响[J].硅酸盐通报, 2017, 36(5):1505-1511.
[2]	梁超锋,何佳俊,肖建庄,等.再生骨料混凝土梁的阻尼性能及其机理分析[J].同济大学学报(自然科学版), 2018, 46(6):737-743.
[3]	郭鹏,韦万峰,杨帆,等.再生集料及再生混凝土界面过渡区研究进展[J].硅酸盐通报, 2017(7):2280-2286,2292.
[4]	孙冰,肖茁良,陈露辉,等.再生混凝土力学性能研究进展[J].硅酸盐通报, 2017, 36(2):497-502.
[5]	丁天庭,李启华,陈树东.再生混凝土的强度及耐久性能研究[J].硅酸盐通报, 2017, 36(3):846-850.
[6]	SHI C. Steel slag-its production, processing, characteristics, and cementitious properties[J]. Journal of Materials in Civil Engineering, 2004, 16(3):230-236.
[7]	JIANG Y, LING T C, SHI C, et al. Characteristics of steel slags and their use in cement and concrete:a review[J]. Resources, Conservation and Recycling, 2018, 136:187-197.
[8]	WANG Q, YANG J, YAN P. Cementitious properties of super-fine steel slag[J]. Powder Technology, 2013, 245:35-39.
[9]	HU S, WANG H, ZHANG G, et al. Bonding and abrasion resistance of geopolymeric repair material made with steel slag[J]. Cement and Concrete Composites, 2008, 30(3):239-244.
[10]	TSAKIRIDIS P E, PAPADIMITRIOU G D, TSIVILIS S, et al. Utilization of steel slag for Portland cement clinker production[J]. Journal of Hazardous Materials, 2008, 152(2):805-811.
[11]	SONG Q, YU R, SHUI Z, et al. Physical and chemical coupling effect of metakaolin induced chloride trapping capacity variation for ultra high performance fibre reinforced concrete (UHPFRC)[J]. Construction and Building Materials, 2019, 223:765-774.
[12]	SIDDIQUE R, KLAUS J. Influence of metakaolin on the properties of mortar and concrete:A review[J]. Applied Clay Science, 2009, 43(3/4):392-400.
[13]	OLIVER W C, PHARR G M. An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments[J]. Journal of Materials Research, 1992, 7(6):1564-1583.
[14]	BROOKS J J, JOHARI M A M. Effect of metakaolin on creep and shrinkage of concrete[J]. Cement and Concrete Composites, 2001, 23(6):495-502.
[15]	WANG Q, YAN P, YANG J, et al. Influence of steel slag on mechanical properties and durability of concrete[J]. Construction and Building Materials, 2013, 47:1414-1420.
[16]	GÜNEYISI E, MERMERDAŞ K. Comparative study on strength, sorptivity, and chloride ingress characteristics of air-cured and water-cured concretes modified with metakaolin[J]. Materials and Structures, 2007, 40(10):1161.
[17]	胡瑾,王强,杨建伟.钢渣-硅灰复合矿物掺合料对混凝土性能的影响[J].清华大学学报(自然科学版), 2015, 55(2):145-149.
[18]	ZHANG B, TAN H, MA B, et al. Preparation and application of fine-grinded cement in cement-based material[J]. Construction and Building Materials, 2017, 157:34-41.
[19]	ZHANG B, TAN H, SHEN W, et al. Nano-silica and silica fume modified cement mortar used as surface protection material to enhance the impermeability[J]. Cement and Concrete Composites, 2018, 92:7-17.
[20]	HU C, LI Z. A review on the mechanical properties of cement-based materials measured by nanoindentation[J]. Construction and Building Materials, 2015, 90:80-90.
[21]	MONDAL P, SHAH S P, MARKS L. A reliable technique to determine the local mechanical properties at the nanoscale for cementitious materials[J]. Cement and Concrete Research, 2007, 37(10):1440-1444.
[22]	FOLEY E M, KIM J J, TAHA M M R. Synthesis and nano-mechanical characterization of calcium-silicate-hydrate (CSH) made with 1.5 CaO/SiO₂ mixture[J]. Cement and Concrete Research, 2012, 42(9):1225-1232.
[23]	崔孝炜,冷欣燕,南宁,等.机械力活化对钢渣粒度分布和胶凝性能的影响[J].硅酸盐通报, 2018, 37(12):3821-3826.
[24]	管宗甫,余远明,王云浩,等.钢渣粉煤灰复掺对水泥性能的影响[J].硅酸盐通报, 2011(6):142-146.