Rheology, bubble-particle interaction and air bubble system: A study of the influence of inorganic salts on air entrainment by bubble rising measurement

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2023-11-01 DOI:10.1016/j.cemconres.2023.107265

Qi Liu , Zheng Chen , Zhitao Chen , Yingzi Yang , Lin Chi

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引用次数: 1

Abstract

Rheological properties and the interaction between air bubbles and solid particles are important factors influencing the air bubble system in air-entrained concrete. The former may affect the bubble motion and the latter may influence the strength of bubbles. However, none of them were properly discussed by direct observation. In this study, we observe the rising behavior of various-sized bubbles in air-entrained cement paste. By a modified drag equation, the bubble-particle interaction is determined and represented by the interaction coefficient K_i. By Ki the bubble-particle interaction can be quantified and correlated with air entrainment properties. In combination with rheological properties and surface tension, the influence of inorganic salts on air entrainment is systematically studied. It is found that the content of bubbles <200 μm and the specific surface area of bubbles in the fresh mortar decrease with the increase of K_i, and the content of bubbles >1000 μm and the spacing factor increase with increasing K_i.

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流变学、气泡-颗粒相互作用和气泡系统:用气泡上升法研究无机盐对空气夹带的影响

流变特性以及气泡与固体颗粒的相互作用是影响充气混凝土气泡体系的重要因素。前者会影响气泡运动，后者会影响气泡的强度。然而，这些问题都没有通过直接观察得到适当的讨论。在本研究中，我们观察了不同大小的气泡在气裹水泥浆体中的上升行为。通过修正的阻力方程，确定了气泡与粒子的相互作用，并用相互作用系数Ki表示。通过Ki可以量化气泡-粒子相互作用，并与空气夹带特性相关联。结合流变性能和表面张力，系统地研究了无机盐对夹带空气的影响。结果表明，新鲜砂浆中200 μm气泡含量和气泡比表面积随Ki的增加而减小，1000 μm气泡含量和间隔系数随Ki的增加而增大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.