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An experimental investigation on the impermeability and durability of concrete with a novel and multifunctional hydrophobic admixture addition
Structural Concrete ( IF 3.2 ) Pub Date : 2021-07-04 , DOI: 10.1002/suco.202100263
Bo Zhang 1, 2 , Qingbin Li 1 , Rui Ma 1 , Xujing Niu 1 , Lin Yang 3 , Yu Hu 1 , Jinliang Zhang 3
Affiliation  

In order to improve the durability of concrete, hydrophobic technology is used to isolate the contact between concrete and external water. The addition of hydrophobic admixture is a popular method, but most of the hydrophobic agents mixed with cement sacrifice the partial strength of concrete to improve the hydrophobicity. In this paper, a novel and multifunctional hydrophobic admixture named YREC was prepared, which has a positive effect on strength, impermeability, and durability under freeze–thaw attack. The chloride resistance permeability of concrete mixed with YREC increases by 5.3 times. Water contact angles up to 108 ± 2° were achieved on the concrete. The action mechanism of YREC was investigated using multiscale pore size distribution by means of nitrogen adsorption and mercury intrusion porosimetry, scanning electron microscope, X-ray diffraction testing, and thermogravimetric analysis (TG). The results indicate that YREC particles can accelerate cement hydration based on TG-DTG analysis. YREC can be more effectively applied in practical engineering due to the simpler preparation process and cheaper raw material.

中文翻译:

新型多功能疏水外加剂混凝土抗渗性和耐久性试验研究

为了提高混凝土的耐久性,采用疏水技术隔离混凝土与外部水的接触。添加疏水剂是一种流行的方法,但大多数疏水剂与水泥混合,会牺牲混凝土的部分强度来提高疏水性。在本文中,制备了一种名为 YREC 的新型多功能疏水性外加剂,该外加剂对冻融攻击下的强度、抗渗性和耐久性有积极影响。掺入YREC的混凝土抗氯渗透性提高5.3倍。在混凝土上实现了高达 108 ± 2° 的水接触角。采用氮气吸附压汞法、扫描电镜、X 射线衍射测试和热重分析 (TG)。结果表明,基于TG-DTG分析,YREC颗粒可以加速水泥水化。YREC由于制备过程更简单,原材料更便宜,可以更有效地应用于实际工程中。
更新日期:2021-07-04
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