对新拌水泥浆中夹带的二氧化碳气泡的自消泡效应的新认识

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

Cement and Concrete Research Pub Date : 2025-02-03 DOI:10.1016/j.cemconres.2025.107815

Suhui Zhang , Min Liu , Keren Zheng , Lou Chen , Caijun Shi , Qiang Yuan

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引用次数: 0

摘要

通过研究新鲜水泥浆体中夹带CO2气泡的演变，对CO2气泡的自消泡作用提出了新的认识。观察到CO2气泡消失的过程，导致空气含量降低。CO2气泡的演化最终形成了两种孔隙结构：中空球壳结构（HSS）和内填充球壳结构（IFSS）。CO2气泡轮廓处CaCO3丰富区域和水化产物内部形成证明了这一点。同时，CO2气泡的自消泡作用促进了新鲜水泥浆体的微观结构积聚，提高了硬化水泥浆体的力学性能。含有CO2气泡的新鲜水泥浆体具有更强的弹性和更高的体积阻力，相应的储存模量上升更快。硬化后水泥浆体抗压强度由29.6 MPa提高到37.3 MPa，孔隙率降低6%。

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New insight into self-antifoaming effect of entrained CO2 bubbles in fresh cement paste

A new insight into self-antifoaming effect of CO₂ bubble was proposed by exploring the evolution of entrained CO₂ bubbles in fresh cement paste. The disappearance process of CO₂ bubbles was observed, resulting in the reduction of air content. The evolution of CO₂ bubbles eventually formed two kinds of pore structures: hollow spherical shell structure (HSS) and interior filled spherical shell structure (IFSS). It was evidenced by the rich area of CaCO₃ at the outline of CO₂ bubble and the interior formation of hydration products. Meanwhile, self-antifoaming effect of CO₂ bubble promoted the microstructural build-up of fresh cement paste and enhanced the mechanical property of hardened cement paste. Fresh cement paste with CO₂ bubbles had stronger elasticity and higher volume resistance, corresponding to the faster rise of storage modulus. The compressive strength of hardened cement paste was increased from 29.6 MPa to 37.3 MPa with a porosity reduction of 6%.

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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.