摘要
混凝土因其优异的性能而成为建筑领域中应用最广泛、产量最大的工程材料。然而在复杂环境作用及服役寿命递增的情况下,以钢筋混凝土结构为主体的工程却出现了大量的结构破坏、强度降低和表面缺陷等问题。其中混凝土工程面层质量差的问题尤为明显,表面开裂、粗骨料外露、回弹强度不足、抗碳化、抗氯离子侵蚀性差等严重影响了建筑结构的耐久性,威胁着建筑物的使用安全,因此提升混凝土的表面质量至关重要。本文研究了含氟混凝土表面增强剂(F-CSE)对混凝土表面回弹强度的影响,结合微观表征方法进一步分析F-CSE对混凝土水化、孔隙结构及显微硬度性能的影响。研究结果表明,F-CSE能够提高混凝土表面回弹强度26.6%,回弹强度提高了约10MPa,粘结强度与有机硅渗透底漆相比,提升了360.4%。F-CSE的渗透深度最大值为2mm,并促进水化产物的形成,填充封堵孔隙,改善局部微观结构,从而提升表面强度。
Concrete has become the most extensive and most productive engineering material in the construction field due to its excellent performance.However,in the case of complex environment and increasing service life,the reinforced structural concrete structure has many problems such as structural damage,reduced strength and surface defects.Among them,the problem of poor quality of concrete engineering surface layer is particularly obvious.The surface cracking,coarse aggregate exposure,insufficient rebound strength,poor carbonization and poor chloride erosion resistance seriously affect the durability of the building structure and threaten the use safety of buildings.Therefore,it is very important to improve the surface quality of concrete.This paper studies the effect of Fluorinated Concrete Surface Enhancer(F-CSE)on the strength of concrete surface rebound,and further analyzes the effect of F-CSE on concrete hydration,pore structure and microhardness properties combined with the microscopic characterization method.The results show that F-CSE was able to improve the rebound strength of concrete surfaces by 26.6%and increased about 10MPa,bond strength by 360.4%compared with the silicone penetration primer.The maximum penetration depth of F-CSE was 2mm.The formation of hydration products were promoted,filling the pores and improving the local microstructure.
作者
孙健翔
黎鹏平
范志宏
李安
SUN Jianxiang;LI Pengping;FAN Zhihong;LI An(CCCC Forth Harbor Engineering Institute Co.,Ltd.,Guangzhou 510230,China;Key Laboratory of Harbor&Marine Structure Durability Technology of the Ministry of Communications,Guangzhou 510230,China)
出处
《建筑结构》
CSCD
北大核心
2022年第S01期1562-1565,共4页
Building Structure
关键词
表面增强剂
回弹强度
微观形貌
surface enhancer
rebound strength
micromorphology
作者简介
第一作者:孙健翔,博士,工程师,主要从事材料设计、合成及改性工作,Email:201510102882@mail.scut.edu.cn;通信作者:李安,硕士,高级工程师,主要从事新材料研发工作,Email:lan@cccc4.com。
