新型高效混凝土复合早强剂.pdf

第31卷第4期
土木工.程与管理学报
Vol 31 No 4
2014年12月
Journal of Civil Engineering and Management
Dec.2014
新型高效混凝士复合早强剂
张长清,贺帅,査道锋,方英杰,刘宗祺,杜明阳
(华中科技大学土木工程与力学学院,湖北武汉430074
摘要:本文选用亚硝酸钠、无水硫酸钠、三乙醇胺和聚羧酸减水剂为新型高效复合早强剂的掺料,应用正交实
验方法设计实验,从而配置新型高效复合早强剂。实验结果表明,在标准养护条件下,该新型高效复合早强剂
可以使得使得水泥试件的1d强度提高到150%,3d、7d28d的强度并没有降低;同时,在此基础上,研究该新
型高效复合早强剂对复掺矿渣以及粉煤灰水泥强度的影响,结果表明,与不掺粉煤灰以及矿渣的水泥试块相
比,当水泥试块的粉煤灰或矿渣的掺量为10%时,该新型高效复合早强剂可以适当的提高胶凝体系的早期强
度;但是,当水泥试块的粉煤灰、矿渣掺量为20%及以上时,胶凝体系与空白组相比,抗压强度降低。
关键词:普通硅酸盐水泥;减水剂;正交试验;复合早强剂
中图分类号:TU528.042.1文献标识码:A文章编号:2095-0985(2014)04-0017-05
Research of New-type Composite Early Strength Accelerator for concrete
ZHANG Chang-gung, HE Shuai, ZHA Dao-feng, FANG Ying-jie, L/U Zong-gi, DU Ming-yang
School of Civil Engineering and Mechanics, Huazhong University of Science and Technology
Wuhan 430074 China
Abstract Using orthogonal experimental design method, this paper studies the optimum ratio of new
type composite early strength accelerator which includes sodium nitrite, anhydrous sodium sulfate
triethanolamine and polycarboxylate superplasticizer. It is shown in the experimental result that the
early strength of cement specimen is dramatically improved after mixing with this additive. Comparing
with the control group, the compressive strength of Id can reach up to 1509 with no following
strength reduetion under the standard curing condition. Then the influence of this additive to cement
containing fly ash or ground granulated blast-furnace slag was explored, and the results show that
when the mixing amount of fly ash or slag is 10% and the amount of the early strength accelerator
remains the same
ng with the ordinary Portland cement, the early strength of the cementitious
system will be improved by the new type composite early strength accelerator. It had to be mentioned
when the amount of mixture is equal to or greater than 20%, the compressive strength of the
cementitious system reduces in contrast with the control group
Key words: ordinary Portland cement; water reducing agent; orthogonal test; compound early
strength agent
早强剂可以加快水泥胶凝体系的水化速度,尤其在北方,冬季施工时温度很低,导致混凝土水
减少其凝结时间,有效提高水泥、混凝土材料的早化反应速度降低,凝结时间变长,不利于工期及质
期强度。早强剂原料易得,成本低廉,性能稳量控制。这时采用早强剂可以有效改善并解决这
定,普适性强,效果显著,被广泛应用于土木工程一问题34
行业中2。我国地域幅员辽阔,各地温差较大,
目前我国较为常用混凝土早强剂主要有氯化
收稿日期:2014-05-23修回日期:2014-09-25
作者简介:张长清(1964-),男,湖北武汉人,副教授,硕士,研究方向为建筑材料( Email: changqing2008@qq,com)
通讯作者:贺帅(1993-),男,山西晋中人,本科生,研究方向为建筑材料( Email: hustheshuait@163,com)