Mechanism and effectiveness of glass powder effect on calcium leaching resistance of primary support concrete in tunnels

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-04-09 DOI:10.1016/j.conbuildmat.2025.141190

Yajun Jiang, Yi Zheng, Liangmin Yu, Longxiang Liao, Yaokun Su

{"title":"Mechanism and effectiveness of glass powder effect on calcium leaching resistance of primary support concrete in tunnels","authors":"Yajun Jiang, Yi Zheng, Liangmin Yu, Longxiang Liao, Yaokun Su","doi":"10.1016/j.conbuildmat.2025.141190","DOIUrl":null,"url":null,"abstract":"<div><div>The long-term calcium leaching of groundwater on the primary support concrete in tunnels is the main cause of crystallization blockage in the tunnel drainage system. To improve the calcium leaching resistance of sprayed concrete, the influence of glass powder with varying particle sizes and dosages on the calcium leaching resistance of sprayed concrete subjected to contact leaching during its initial formation stages was investigated. The test results show that before the 14th day of leaching, the glass powder primarily improves the calcium leaching resistance of sprayed concrete through the filling effect and nucleation effect. After the 14th day of leaching, the pozzolanic effect gradually becomes the main factor to enhance calcium leaching resistance. In the long-term state, glass powder of all three particle sizes can improve the calcium leaching resistance of sprayed concrete, and finer particles have a better effect. However, due to its larger particle size compared to cement, glass powder with a median particle size of 36.64 μm increases calcium ion leaching before the 15th day of leaching. Therefore, it is recommended to use glass powder with a median particle size smaller than cement in the initial tunnel support concrete. Glass powder with a median particle size of 1.2 μm and a dosage of 20 % has the best effect on reducing calcium ion leaching from concrete, achieving 43.66 % reduction during the test period. When the dosage of glass powder is 5 %, the nucleation effect is the best, and it gradually weakens as the dosage increases.</div></div>","PeriodicalId":288,"journal":{"name":"Construction and Building Materials","volume":"474 ","pages":""},"PeriodicalIF":7.4000,"publicationDate":"2025-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Construction and Building Materials","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0950061825013388","RegionNum":1,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

The long-term calcium leaching of groundwater on the primary support concrete in tunnels is the main cause of crystallization blockage in the tunnel drainage system. To improve the calcium leaching resistance of sprayed concrete, the influence of glass powder with varying particle sizes and dosages on the calcium leaching resistance of sprayed concrete subjected to contact leaching during its initial formation stages was investigated. The test results show that before the 14th day of leaching, the glass powder primarily improves the calcium leaching resistance of sprayed concrete through the filling effect and nucleation effect. After the 14th day of leaching, the pozzolanic effect gradually becomes the main factor to enhance calcium leaching resistance. In the long-term state, glass powder of all three particle sizes can improve the calcium leaching resistance of sprayed concrete, and finer particles have a better effect. However, due to its larger particle size compared to cement, glass powder with a median particle size of 36.64 μm increases calcium ion leaching before the 15th day of leaching. Therefore, it is recommended to use glass powder with a median particle size smaller than cement in the initial tunnel support concrete. Glass powder with a median particle size of 1.2 μm and a dosage of 20 % has the best effect on reducing calcium ion leaching from concrete, achieving 43.66 % reduction during the test period. When the dosage of glass powder is 5 %, the nucleation effect is the best, and it gradually weakens as the dosage increases.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.