振动搅拌对混凝土抗压强度及抗氯离子渗透性能的影响被引量：4

Influence of vibration mixing on the compressive strength and chloride penetration of concrete

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摘要为探究振动搅拌对混凝土硬化性能及微观孔结构影响,选用了不同搅拌时间分别制备成型了C30和C50混凝土试件,测试了其3、7及28d抗压强度,并采用RCM法测试了混凝土28d抗氯离子渗透性能,采用压汞法测试了混凝土中砂浆的孔结构。结果表明:与普通强制搅拌相比,搅拌时间120s时,振动搅拌对C50混凝土总孔隙含量无明显影响,但减小了其平均孔径并增加了其凝胶孔含量,显著提升了其3d和7d抗压强度,及28d抗氯离子渗透性能;搅拌时间90~180s范围内,振动搅拌减小了C30混凝土总孔隙含量,但增大了其平均孔径,对其抗压强度无明显影响,同时振动搅拌减少了C30混凝土总孔隙含量和毛细孔含量,显著降低了其28d氯离子扩散系数。 To explore the influence of vibration mixing on hardening property and micropore structure of concrete,different vibration mixing time was used to prepare concrete specimens with different strength levels and the compressive strength of concrete was tested at 3d, 7d and 28d. The chloride ion diffusion coefficient of concrete at 28d was measured by RCM method. The pore structure of mortar in concrete was tested by mercury injection method. Compared with ordinary forced mixing, when the mixing time is 120s, vibration mixing has no significant effect on the total porosity of C50 concrete but vibration mixing reduces the average pore diameter and increases the gel pore content, thereby significantly improving its 3d and 7d compressive strength, and vibration stirring reduces its 28d chloride ion diffusion coefficient. In the mixing time range of 90s to 180s, vibration mixing increases the average pore diameter of C30concrete, thereby weakening the positive effect of the reduction of total porosity and compressive strength, and its compressive strength has no obvious change. Vibration mixing reduces the total porosity and pore content of concrete and significantly reduces its 28d chloride ion diffusion coefficient.

作者丁平祥李伟伟朱海威赵家琦谢小明 DING Pingxiang;LI Weiwei;ZHU Haiwei;ZHAO Jiaqi;XIE Xiaoming(CCCC Fourth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;Key Laboratory of Harbor&Marine Structure Durability Technology of Transportation Industry,Guangzhou 510230,China;The Second Engineering Company of CCCC Fourth Harbor Engineering Co.,Ltd.,Guangzhou 510000,China)

机构地区中交四航工程研究院有限公司水工构造物耐久性技术交通运输行业重点实验室中交四航局第二工程有限公司

出处《建筑结构》 CSCD 北大核心 2022年第S02期1024-1030,共7页 Building Structure

关键词振动搅拌抗压强度氯离子扩散系数孔结构 vibration stirring compressive strength chloride diffusion coefficient pore structure

分类号 TU528 [建筑科学—建筑技术科学]

作者简介第一作者:丁平祥,硕士,主要从事建筑材料研究,Email:838282787@qq.com。