|本期目录/Table of Contents|

[1]刘成龙,邓敏,莫立武,等.用菱镁矿尾矿制备的MgO膨胀剂对砂浆强度与膨胀性能的影响[J].南京工业大学学报(自然科学版),2018,40(06):26-31.[doi:10.3969/j.issn.1671-7627.2018.06.005]
 LIU Chenglong,DENG Min,MO Liwu,et al.Effects of MgO expansive agents from magnesite tailings on expansion and strength of mortars[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2018,40(06):26-31.[doi:10.3969/j.issn.1671-7627.2018.06.005]
点击复制

用菱镁矿尾矿制备的MgO膨胀剂对砂浆强度与膨胀性能的影响()
分享到:

《南京工业大学学报(自然科学版)》[ISSN:1671-7627/CN:32-1670/N]

卷:
40
期数:
2018年06期
页码:
26-31
栏目:
出版日期:
2018-11-20

文章信息/Info

Title:
Effects of MgO expansive agents from magnesite tailings on expansion and strength of mortars
文章编号:
1671-7627(2018)06-0026-06
作者:
刘成龙1邓敏12莫立武1恽进进1周保福1严嫚1
1.南京工业大学 材料科学与工程学院 材料化学工程国家重点实验室,江苏 南京 210009; 2.江苏先进生物与化学制造协同创新中心,江苏 南京 210009
Author(s):
LIU Chenglong1DENG Min12MO Liwu1YUN Jinjin1 ZHOU Baofu1YAN Man1
1.State Key Laboratory of Materials-Oriented Chemical Engineering,College of Materials Science and Engineering,Nanjing Tech University,Nanjing 210009,China; 2.Jiangsu National Synergetic Innovation Center for Advanced Materials,Nanjing 210009,China
关键词:
菱镁矿尾矿 MgO膨胀剂 砂浆 膨胀 强度
Keywords:
magnesite tailings MgO expansive agents mortars expansion strength
分类号:
TU528
DOI:
10.3969/j.issn.1671-7627.2018.06.005
文献标志码:
A
摘要:
研究海城和莱州菱镁矿尾矿在950 ℃煅烧1 h制备的MgO膨胀剂(MEA)对砂浆试件膨胀性能和强度的影响规律,并分析掺MgO膨胀剂水泥浆体中MgO的水化程度。结果表明:海城MgO膨胀剂(HC-MEA)中MgO活性高,水化快,掺HC-MEA砂浆90 d膨胀比较大,90~150 d膨胀增长趋势减缓; 莱州MgO膨胀剂(LZ-MEA)中MgO活性低,水化慢,掺LZ-MEA砂浆60 d膨胀比较小,60~150 d膨胀发展较快; MEA掺量相同时,掺HC-MEA砂浆试件的膨胀率大于掺LZ-MEA砂浆试件的膨胀率。粉煤灰能抑制掺MEA砂浆试件的膨胀,抑制作用随养护温度的升高或MEA掺量的增加而减小。与未掺MEA砂浆相比,掺8% HC-MEA砂浆的90 d抗压、抗折强度分别提高了5.84%和1.12%,掺8%LZ-MEA砂浆的90 d抗压、抗折强度分别提高了1.84%和4.24%。
Abstract:
The effect of MgO expansive agents(MEA)prepared by calcining Laizhou and Haicheng magnesite tailings at 950 ℃ for 1 h on the expansion and strength of mortars were investigated.The hydration degree of periclase in MEA in cement pastes was also analyzed.Results showed that highly active MgO expansive agents by calcining Haicheng magnesite tailings(HC-MEA)might cause a relatively quick development of expansion of mortars before 90 d and slow development of expansion of mortars during 90 and 150 d.The lowly active MgO expansive agents produced by calcining Laizhou magnesite tailings(LZ-MEA)and incorporated in mortars expanded at a relatively low rate before 60 d and generated a relatively large expansion during 60 and 150 d.The expansion of mortars with HC-MEA was higher than that with LZ-MEA.Fly ash tended to inhibit the expansion of mortars with MEA.Compared with the strength of mortars without MEA,the compressive and flexural strengths at 90 d of mortars with 8% HC-MEA were increased by 5.84% and 1.12%,respectively. The compressive and flexural strengths at 90 d of mortars with 8% LZ-MEA were increased by 1.84% and 4.24%,respectively.

参考文献/References:

[1] 桂海清,葛炜,王周松,等.高强高性能混凝土的体积稳定性[J].材料科学与工程学报,2003,21(3):460.
[2] 郝成伟,邓敏,莫立武,等.粉煤灰对水泥浆体自收缩和抗压强度的影响[J].建筑材料学报,2011,6(6):746.
[3] HUANG K,DENG M,MO L,et al.Early age stability of concrete pavement by using hybrid fiber together with MgO expansion agent in high altitude locality[J].Construction and building materials,2013,48:685.
[4] MATULOVÁK,UNÍS.Effect of shrinkage reducing admixtures(SRA)on selected properties of cement mortars[J].Civil engineering and architecture research,2014,1(4):278.
[5] COLLEPARDI M,BORSOI A,COLLEPARDI S,et al.Effects of shrinkage reducing admixture in shrinkage compensating concrete under non-wet curing conditions[J].Cement and concrete composites,2005,27:704.
[6] 尚燕.混凝土膨胀剂的研究进展[J].建材技术与应用,2007(1):20.
[7] MO L,DENG M,MINGSHU T,et al.MgO expansive cement and concrete in China:past,present and future[J].Cement and concrete research,2014,57:1.
[8] 徐玲玲,邓敏,王侠,等.新型镁质膨胀材料的制备[J].材料科学与工程学报,2004,5(2):249.
[9] 何勇,姜明.我国菱镁矿资源的开采利用现状及存在的问题[J].耐火与石灰,2012,37(3):25.
[10] 王光银,邓敏,莫立武,等.菱镁矿品位对MgO膨胀剂组成结构及性能的影响[J].材料科学与工程学报,2014,32(5):658.
[11] 骆菁菁.新型生态混凝土膨胀剂的制备及性能表征[D].南京:南京航空航天大学,2011.
[12] 王光银.低品位菱镁矿制备氧化镁膨胀剂及膨胀性能的研究[D].南京:南京工业大学,2014.
[13] 陈福松,徐玲玲,张志宾.水泥熟料中方镁石定量分析[J].硅酸盐通报,2009,28(6):1295.
[14] 邓敏,崔雪华,刘元湛,等.水泥中氧化镁的膨胀机理[J].南京化工学院学报,1990,12(4):1.

相似文献/References:

[1]涂永恒,邓敏,莫立武,等.自然条件下MgO混凝土体积变形[J].南京工业大学学报(自然科学版),2018,40(06):20.[doi:10.3969/j.issn.1671-7627.2018.06.004]
 TU Yongheng,DENG Min,MO Liwu,et al.Volume deformation of concrete with MgO expansive agents exposed to natural environment[J].Journal of NANJING TECH UNIVERSITY(NATURAL SCIENCE EDITION),2018,40(06):20.[doi:10.3969/j.issn.1671-7627.2018.06.004]

备注/Memo

备注/Memo:
收稿日期:2017-03-22
基金项目:国家科技支撑计划(2011BAE27B01); 国家自然科学基金重点项目(51461135003); 国家重点研发计划(2016YFB0303601)
作者简介:刘成龙(1991—),男,湖北仙桃人,硕士,主要研究方向为无机非金属材料; 邓敏(联系人),教授,E-mail:dengmin@njtech.edu.cn.
引用本文:刘成龙,邓敏,莫立武,等.用菱镁矿尾矿制备的MgO膨胀剂对砂浆强度与膨胀性能的影响[J].南京工业大学学报(自然科学版),2018,40(6):26-31..
更新日期/Last Update: 2018-11-30