自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

您目前所在的位置:首页 - 期刊简介 - 详细页面

中南大学学报(自然科学版)

Journal of Central South University

第51卷    第5期    总第309期    2020年5月

[PDF全文下载]    [Flash在线阅读]

    

文章编号:1672-7207(2020)05-1189-11
掺磨细镍铁渣混凝土的耐久性及其与孔结构和水化程度的关系
王申,李保亮,潘子云,孙超,张亚梅

(东南大学 材料科学与工程学院,江苏省土木工程材料重点实验室,江苏 南京,211189)

摘 要: 研究不同镍铁渣掺量、同强度等级的镍铁渣混凝土的耐久性,并讨论耐久性与其浆体孔结构和水化程度的关系。研究结果表明:在早期自然养护下,掺镍铁渣使混凝土抗渗性略有下降、碳化速率加快;氯离子渗透速率随镍铁渣掺量提高而小幅上升;在硫酸盐侵蚀条件下,掺量为20%的镍铁渣混凝土的质量损失比空白组的小,掺量为30%的镍铁渣混凝土的质量损失比空白组的大;与早期自然养护相比,早期蒸汽养护使镍铁渣混凝土孔隙率上升、碳化速率加快、硫酸盐侵蚀过程中的质量损失增大;但掺镍铁渣有助于改善早期蒸汽养护导致混凝土抗氯离子渗透性能下降。镍铁渣的掺入导致胶凝材料水化程度降低和水化产物中CH含量减少,进而对混凝土耐久性造成影响。

 

关键字: 镍铁渣混凝土;抗渗性;抗碳化性能;抗氯离子渗透性能;抗硫酸盐侵蚀性能;孔结构

Durability and its relation with pore structure and hydration degree of concrete with ferronickel slag powder
WANG Shen, LI Baoliang, PAN Ziyun, SUN Chao, ZHANG Yamei

Jiangsu Key Laboratory of Construction Materials, School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Abstract:The durability of concrete with different ferronickel slag(FNS) contents and the same strength level was studied, and the relationship between durability of concrete and pore structures and hydration degree of pastes was discussed. The results show that during the initial natural curing, the resistance to water penetration is slightly weakened and the carbonation is accelerated when FNS is used in concrete. Moreover, the permeability of chloride for concrete with FNS increases moderately with the increase of FNS content. As for sulfate attack, the mass loss of concrete with FNS content of 20% is smaller than that of blank group, but it is larger when the FNS content is up to 30%. By contrast, initial steam curing resulting in higher porosity for pastes with FNS further accelerates carbonation and increases mass loss during sulfate attack of concrete with FNS. However, the use of FNS mitigates the fall of chloride resistance of concrete caused by initial steam curing. The use of FNS results in the decrease of hydration degree of cementitious materials and the content of CH, which further affects the long-term performance of concrete.

 

Key words: concrete with ferronickel slag; resistance to water penetration; carbonation resistance; resistance to chloride penetration; resistance to sulphate attack; pore structure

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
版权所有:《中南大学学报(自然科学版、英文版)》编辑部
地 址:湖南省长沙市中南大学 邮编: 410083
电 话: 0731-88879765(中) 88836963(英) 传真: 0731-88877727
电子邮箱:zngdxb@csu.edu.cn 湘ICP备09001153号