Inorganic Chemicals Industry >
Research on contractility of alkali activated slag mortar
Received date: 2020-04-21
Online published: 2020-11-24
The influence of expansive agents dasages,alkali concentration and modulus of sodium silicate on drying shrinkage and mass loss of alkali activated slag was investigated by XRD,SEM and TG.The results indicated that the addition of CaO expansive agent caused swelling phenomenon on alkali activated slag,and the expansion value increased with the dosage of CaO expansive agent（6%~10%）.While the addition of calcium oxide-calcium sulphoaluminate expansive agent didn′t improve the shrinkage of alkali activated slag.The results of XRD and SEM tests showed that Ca（OH）2 was the main expansion component in CaO expansive agent.Besides,no AFt prepared after the addition of calcium oxide-calcium sulphoaluminate expansive agent was the main reason that CS could not improve the shrinkage of slag.The effect of expansive agent in activated slag was affected by calcium oxide-calcium sulphoaluminate and alkali concentration.Expansive agents could decrease the mass loss and free water content of SG and CaO expansive agent could significant reduce that.
Pengfei Ma , Shuang Li , Baojun Cheng , Shengrong Kang , Ping Zhang , Yuxin Gao . Research on contractility of alkali activated slag mortar[J]. Inorganic Chemicals Industry, 2020 , 52(10) : 145 -150 . DOI: 10.11962/1006-4990.2019-0586
| [1] | Ye H, Cartwright C, Rajabipour F, et al. Understanding the drying shrinkage performance of alkali-activated slag mortars[J]. Cement & Concrete Composites, 2017,76:13-24. |
| [2] | Mastali M, Kinnunen P, Dalvand A, et al. Drying shrinkage in alkaliactivated binders-A critical review[J]. Construction & Building Materials, 2018,190:533-550. |
| [3] | Thomas R J, Lezama D, Peethamparan S. On drying shrinkage in allkali-activated concrete:Improving dimensional stability by aging or heat-curing[J]. Cement & Concrete Research, 2017,91:13-23. |
| [4] | Collins F, Sanjayan J G. Microcracking and strength development of alkali activated slag concrete[J]. Cement & Concrete Composites, 2001,23(4/5):345-352. |
| [5] | 陈科, 杨长辉, 潘群, 等. 碱-矿渣水泥砂浆的干缩特性[J]. 重庆大学学报, 2012(5):64-68. |
| [6] | 杨长辉, 陈科, 于泽东, 等. 矿物掺合料对碱矿渣水泥砂浆干缩性能的影响[C]// 中国硅酸盐学会水泥分会.中国硅酸盐学会水泥分会第三届学术年会暨第十二届全国水泥和混凝土化学及应用技术会议论文摘要集, 2011. |
| [7] | 汪国华, 于泽东. 外加剂对碱矿渣水泥砂浆干缩性能的影响[J]. 土木建筑与环境工程, 2012(S2):115-116. |
| [8] | Lee N K, Jang J G, Lee H K. Shrinkage characteristics of alkali-activated fly ash/slag paste and mortar at early ages[J]. Cement & Concrete Composites, 2014,53:239-248. |
| [9] | Bakharev T, Sanjayan J G, Cheng Y B. Effect of admixtures on properties of alkali-activated slag concrete[J]. Cement & Concrete Research, 2000,30(9):1367-1374. |
| [10] | Palacios M, Puertas F. Effect of shrinkage-reducing admixtures on the properties of alkali-activated slag mortars and pastes[J]. Cement & Concrete Research, 2007,37(5):691-702. |
| [11] | Bilim C, Karahan O, Atis C D, et al. Influence of admixtures on the properties of alkali-activated slag mortars subjected to different curing conditions[J]. Materials & Design, 2013,44:540-547. |
| [12] | 代明, 袁杏, 柯国军. 浅谈混凝土膨胀剂[J]. 硅谷, 2010(4):86-87. |
| [13] | 吴中伟. 补偿收缩混凝土[M]. 北京: 中国建筑工业出版社, 1979. |
| [14] | Yuan X, Chen W, Lu Z, et al. Shrinkage compensation of alkaliactivated slag concrete and microstructural analysis[J]. Construction & Building Materials, 2014,66:422-428. |
| [15] | 杨长辉, 梅琳. 辅助胶凝材料对碱矿渣混凝土限制膨胀率的影响[J]. 混凝土, 2010（9）：42-45. |
| [16] | Ye H, Radlinska A. Shrinkage mitigation strategies in alkali-activated slag[J]. Cement & Concrete Composites, 2017,101:131-143. |
| [17] | 李爽, 张之璐, 唐德莎, 等. CaO类膨胀剂对碱矿渣水泥砂浆限制膨胀率影响研究[J]. 硅酸盐通报, 2018,37(5):1747-1752. |
| [18] | Chen W, Brouwers H J H. The hydration of slag,part 1:reaction models for alkali-activated slag[J]. Journal of Materials Science, 2007,42(2):428-443. |
| [19] | 梅琳. 碱矿渣混凝土干缩性能及改善措施研究[D]. 重庆:重庆大学, 2010. |
| [20] | Ferone C, Colangelo F, Roviello G. Application-oriented chemical optimization of a metakaolin based geopolymer[J]. Materials, 2013,6(5):1920-1939. |
| [21] | 楼宗汉, 徐先宇, 韩韧. 矿渣水泥中钙矾石形成条件及其作用[J]. 硅酸盐学报, 1981(3):295-301,376. |
| [22] | 顾亚敏, 方永浩. 碱矿渣水泥的收缩与开裂特性及其减缩与增韧[J]. 硅酸盐学报, 2012,40(1):76-84. |
| [23] | 牟善彬, 孙振亚, 苏小萍. 高游离氧化钙水泥的显微结构与膨胀机理研究[J]. 武汉理工大学学报, 2001(11):27-29. |
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