[1]田凯歌,王恒岳,王琰帅,等.碱激发赤泥-矿渣人造骨料及其砂浆性能研究[J].西安建筑科技大学学报(自然科学版),2023,55(04):528-539.[doi:10.15986/j.1006-7930.2023.04.007 ]
　TIAN Kaige,WANG Hengyue,WANG Yanshuai,et al.Study on alkali-activated red mud-slag artificial aggregate and its mortar performance[J].J. Xi'an Univ. of Arch. & Tech.(Natural Science Edition),2023,55(04):528-539.[doi:10.15986/j.1006-7930.2023.04.007 ]
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碱激发赤泥-矿渣人造骨料及其砂浆性能研究()
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西安建筑科技大学学报（自然科学版）[ISSN:1006-7930/CN:61-1295/TU]

卷:
55
期数:
2023年04期
页码:
528-539
栏目:
出版日期:
2023-10-26

文章信息/Info

Title:
Study on alkali-activated red mud-slag artificial aggregate and its mortar performance
文章编号:
1006-7930(2023)04-0528-12
作者:
田凯歌1; 2; 王恒岳2; 王琰帅2; 董必钦2; 戴建国3; 邢 锋1; 2
(1.中国地震局工程力学研究所，中国地震局地震工程与工程振动重点实验室，黑龙江 哈尔滨 150080; 2.深圳大学 土木与交通工程学院，广东 深圳 518060; 3.香港理工大学 土木与环境工程系，香港 999077)
Author(s):
TIAN Kaige1; 2;  WANG Hengyue2;  WANG Yanshuai2;  DONG Biqin2;  DAI Jianguo3;  XING Feng1; 2
(1.Key Laboratory of Earthquake Engineering and Engineering Vibration, Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China; 2.College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China; 3.Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hongkong 999077, China)
关键词:
碱激发人造骨料;  赤泥;  化学稳定性;  人造骨料砂浆;  强度
Keywords:
alkali-activated artificial aggregates;  red mud;  chemical stability;  mortar with artificial aggregates;  strength
分类号:
TU526
DOI:
10.15986/j.1006-7930.2023.04.007
文献标志码:
A
摘要:
利用碱激发技术,采用赤泥和矿渣作为前驱体,以水玻璃为碱激发剂,通过冷固结成球工艺制备碱激发赤泥-矿渣人造骨料.实验结果表明所制备的人造骨料的堆积密度低于1 200 kg/m3,平均单颗粒破碎强度可达10.61 MPa,筒压强度最高21.17 MPa,满足轻集料规范中对骨料的技术要求.人造骨料的水化产物主要为C-(N)-A-S-H凝胶、C-S-H凝胶及少量钙矾石.经过28 d饱和Ca(OH)2溶液浸泡,人造骨料的化学成分未发生明显变化,表明在混凝土模拟孔溶液环境下其化学稳定性良好.进一步,以水泥为胶凝材料制备人造骨料砂浆,其28 d强度可达54.2 MPa.利用赤泥-矿渣人造骨料部分替代自然骨料制备砂浆,50%替代率砂浆28 d平均强度提高24.6%.综上所述,碱激发赤泥-矿渣人造骨料不仅可以用于制备人造轻质骨料,改善天然骨料供给不足的现状,还可实现赤泥规模化回收利用.
Abstract:
In this study, alkali activated red mud-slag artificial aggregates were prepared by cold-bonded pelletization technology using red mud and granulated ground blast furnace slag(GGBS)as precursors and sodium silicate as the alkali activator. The experimental results show that bulk densities of the artificial aggregates are less than 1200kg/m3, the average single-particle crushing strength is up to 10.61 MPa and the cylinder compressive strength is up to 21.17 MPa, which meets the specification requirements for the lightweight aggregates. The hydration products of artificial aggregates are mainly the calcium-sodium-silicate-hydrate(C-(N)-A-S-H)gels, calcium-silicate-hydrate(C-S-H)gels and a small amount of ettringites(AFts). After 28 days immersion in saturated Ca(OH)2 solution, no obvious chemical change was detected in the artificial aggregates, indicating that their chemical stability was good in the simulated concrete pore solution. Furthermore, the 28-day compressive strength of cement mortars with the artificial aggregates can reach 54.2 MPa. The average 28-day compressive strength of mortar with 50% partially replaced artificial aggregates could increase by 24.6%. In total, red mud can be manufactured as alkali-activated artificial aggregates to address both the shortage of natural aggregates and the recycling of red mud.

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备注/Memo

备注/Memo:
收稿日期:2022-11-11修回日期:2023-07-16
基金项目:国家基金委与香港研究资助局联合科研资助基金合作研究基金项目(NSFC-RGC，52061160481)
第一作者:田凯歌(1991—)，男，硕士，主要从事碱激发人造骨料研究.E-mail:tiankaige@outlook.com
通信作者:邢 锋(1965—)，男，教授，博士生导师，主要从事混凝土耐久性研究.E-mail:xingf@szu.edu.cn
更新日期/Last Update: 2023-08-28