增粘剂对高流动砂浆性能影响的试验研究.pdf

新型
全国中文核心期刊
增粘剂对离流动砂浆性能影响的
试验研究
陈春珍,张金喜,金珊珊,陈炜林,李建军
(1.北京工业大学道路与铁道工程学科,北京100124
2.河北省大广高速公路衡大段等建处,河北南官055750
摘要:探讨了增粘剂的种类及掺量对高流动砂浆工作性能、力学性能和微孔结构的影响。结果表明,试验的3种增粘剂均使砂
浆的工作性能改善;对砂浆强度都有一定的影响,28d时,PR-328降低了砂浆的抗压强度,而HPMC和HTL-S100使砂浆的抗压强
度增大,这3种增粘剂对砂浆的抗折强度影响不大:随龄期的延长,3种增粘剂都会抑制砂浆的微观孔隙率和微观总孔隙量的降低,
孔径分布发生变化
关键词:高流动砂浆;增粘剂;工作性能;力学性能;微孔结构
中图分类号:TQ17.6
文献标识码:A
文章编号:1001-702X(2010)05-0005-04
ntative study on influences of viscosity-modifying admixtures to basic characteristics of big fluidity mortar
CHEN Chunzhen, ZHA NG Jinxi, N Shanshan CHEN Weilin LI Jianjun?
(1. Road and railway
engineering, Beijing University of Technology, Beijing 100124, China;
2. Hebei Daguang Highway Hengda Section Planning Department, Nangong 55750, Hebei, China)
Abstracts: The influences of types and content of viscosity -modifying admixture on the working performance,physical
performance and microcellular structure of the big fluidity mortar are discussed. The results show that the three tested viscosity
modifying admixtures can all improve the working performance of the mortar and has certain impact on the mortar strength. After
28 days, PR-328 decreases the compressive strength of the mortar, while HPMC and HTL-S100 increases the compressive strengt
of the mortar. All three mixtures have little impact on the tensile strength of the mortar with the extension of the period, the three
mixtures will suppress the decreasing of microcellular rate and total microcellular rate and change the aperture distribution
Key words: big fluidity mortar v t y-modifying admixture working per ormance physical performanee microcellular structure
增粘剂是近几年研究开发的一种新型水泥混凝土外加掺入增粘剂会对砂浆和混凝土性能有影响叩。本文主要研究3
剂,能够增加水泥胶凝材料的粘聚性和粘结力,減少材料组分种增粘剂(PR-328、HPMC、HTL-S100)及其掺量对高流动砂
的分离率,提高水泥胶凝材料的匀质性。增粘剂目前正越来越浆力学性能、工作性能和孔隙构造的影响。
多地用于水泥混凝土中,主要应用于高流动砂浆、高流动混凝
土、水下不分散混凝士以及喷射混凝土中。
实验
增粘剂能显著增加水溶液的黏度,解决高流动度、高扩展1.1原材料
度的新拌砂浆和混凝土的变形能力和抗离析性的矛盾,但是
水泥:采用北京水泥厂的金隅牌P?042.5普通硅酸盐水
泥,密度3glem3,3d抗折及抗压强度分别为5.9、284MPea,28
基金项目:河北省交通厅科技计划项目(Y-070112)
d抗折及抗压强度分别为9,6、56.2MPa
收稿日期:2009-12-10
秒:河砂,密度2,67g(em3,堆积密度145gycm,堆积空
作者笛介:陈春珍,女,1982年生,福建漳州人,硕士研究生。地址:北隙率4401%,细度模数2.6,含泥量2.7%,属Ⅱ区中砂。
京市朝阳区平乐园100号北京工业大学交通研究中心,电话:
粗骨料:5~16mm连续级配的卵石,密度2.7gfem,堆积
13488675190, E-mail: chenchunzhhenscc0163com
密度157gem,空隙率41.59%,压碎指标1334%,含泥量
NEW BUILDING MATERIALS
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