掺新型膨胀材料水泥砂浆变形性能研究

张红波; 高培伟; 耿飞; 陈雄; 赵洁

doi:10.13204/j.gyjz201207020

掺新型膨胀材料水泥砂浆变形性能研究

doi: 10.13204/j.gyjz201207020

1.
南京航空航天大学土木工程系南京 210016

基金项目:

863国家高技术研究发展计划(2009AA03Z508);西部交通项目(2009B01)

详细信息

作者简介:
张红波，男，1987年出生，硕士。Email：zhanghongbo87@163.com

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- 被引次数: 0
出版历程
- 收稿日期: 2011-08-09
- 刊出日期: 2012-07-20

RESEARCH ON DEFORMATION OF MORTAR WITH NOVEL EXPANSIVE AGENT

1.
Department of Civil Engineering,Nanjing University of Aeronautic &Astronomic,Nanjing 210016,China

摘要

摘要: 基于对富镁尾矿资源化利用途径的开发,制备新型膨胀材料,对新型膨胀材料与掺合料对水泥砂浆自由变形、干缩变形和限制变形性能的影响展开研究。结果表明:升高水化温度对水泥砂浆前期膨胀速率的增加比较明显,对水化后期影响较小;膨胀材料和粉煤灰双掺可较好地抑制水泥砂浆的干缩,使干缩在90 d就趋于稳定;养护温度对水泥砂浆限制膨胀率影响较大,使用该膨胀材料时要注意温控;拟合曲线表明,该新型膨胀材料具有持续稳定的膨胀性能,不存在无限膨胀和回缩现象。
- 膨胀材料 /
- 混凝土 /
- 砂浆 /
- 变形 /
- 干缩
Abstract: A novel expansive agent was prepared by using magnetite and dolomite tailings through certain process.The deformation properties of mortar mixed with expansive agent and fly ash were investigated. Results showed that atthe early age, the expansion speed increased obviously with the increase of hydration temperature, but at the later agethere was no obvious effect on the increase of expansion speed. The dry shrinkage of mortar can be seriouslysuppressed by both expansive agents and fly ash, and dry shrinkage tended stable at the age of 90 d. The temperaturewas an important factor for the restricted expansion of mortar, so the temperature should be strictly controlled whenusing this expansive agent. The regression analysis curve showed that the expansion properties of this expansive agentwere stable through the whole course of hydration, and there was no excessive expansion and retraction.
- expansive agent /
- concrete /
- mortar /
- deformation /
- dry shrinkage

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参考文献(12)

吴中伟.补偿收缩混凝土[M].北京:中国建筑工业出版社,1979.

[2] 朱伯芳.论微膨胀混凝土筑坝技术[J].水利发电学报,2000,18(3):1-13.

[3] 高培伟,卢小琳,唐明述.膨胀剂对混凝土变形性能的影响[J].南京航空航天大学学报,2006,38(2):251-255.

[4] 刘数华,方坤河.MgO混凝土自生体积变形的数学模型[J].水力发电学报,2006,25(1):81-84.

[5] Gao Peiwei,Lu Xiaolin.Using a New Composite ExpansiveMaterial to Decrease Deformation and Fracture of Concrete[J].Materials Letters,2008,62(1):106-108.

[6] 陈昌礼,李承木.外掺MgO与水泥内含MgO在大体积混凝土中的膨胀效应[J].混凝土,2009(11):74-77.

[7] Nokken M.Expansion of MgO in Cement Pastes Measured byDifferent Methods[J].ACI Material Journal,2008,409(1):1-17.

[8] Peiwei Gao,Xiaolin Lu.Production of MgO-Type Expansive Agentin Dam Concrete by Use of Industrial By-Products[J].Buildingand Environment,2008,43(4):453-457.

[9] Burrows R W,Kepler W F,Hurcomb D,et al.Three SimpleTests for Selecting Low Crack Cement[J].Cement and ConcreteComposites,2004,26(5):509-519.

[10] 马婧姝,张少明.新型复合MgO膨胀材料的膨胀效果[J].南京工业大学学报,2009,31(4):89-93.

[11] 陈胡星,马先伟.粉煤灰对氧化镁微膨胀水泥膨胀性能的影响及其机制[J].材料科学与工程学报,2010,28(2):181-185.

[12] 阎培渝,陈广智.养护温度和胶凝材料组成对膨胀剂限制膨胀率的影响[J].建筑技术,2001,32(1):22-23.

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