Preparation and application of environmentally friendly liquid alkali-free and fluorine-free accelerator for shotcrete

IF 3.4 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Materials and Structures Pub Date : 2025-02-23 DOI:10.1617/s11527-025-02601-4

Peng Hu, Hongyu Ji, Kun Wang, Feng Zhao, Baicheng Liu, Rongxiao Sun, Yulong Zhao

{"title":"Preparation and application of environmentally friendly liquid alkali-free and fluorine-free accelerator for shotcrete","authors":"Peng Hu, Hongyu Ji, Kun Wang, Feng Zhao, Baicheng Liu, Rongxiao Sun, Yulong Zhao","doi":"10.1617/s11527-025-02601-4","DOIUrl":null,"url":null,"abstract":"<div><p>A liquid accelerator is a key component in shotcrete; however, it often faces challenges such as high alkali content and insufficient long-term concrete strength. This study utilizes polyaluminum sulfate as the primary raw material to develop an environmentally friendly, alkali-free, and fluorine-free accelerator (FAF). Through orthogonal experiments and cement compatibility tests, the effects of FAF on setting time, 1 day compressive strength, and 28 days compressive strength ratio of cement paste were analyzed, leading to the determination of the optimal FAF mixing ratio. The coagulation-promoting mechanism of FAF was further examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM) results. Additionally, concrete slab tests were conducted to assess the impact of different FAF dosages on concrete rebound rates and mechanical properties, with the optimal dosage range found to be 4–8%. Field trials indicated that, at a 6% FAF dosage, shotcrete rebound rates on tunnel arch walls and roofs were 10.3% and 13.5%, respectively. The composition of the FAF does not contain alkali metal salts, which reduces the risk of alkali-aggregate reactions in concrete and minimizes the potential health risks to construction personnel, aligning with the global trend towards sustainable construction practices.</p></div>","PeriodicalId":691,"journal":{"name":"Materials and Structures","volume":"58 2","pages":""},"PeriodicalIF":3.4000,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Materials and Structures","FirstCategoryId":"5","ListUrlMain":"https://link.springer.com/article/10.1617/s11527-025-02601-4","RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CONSTRUCTION & BUILDING TECHNOLOGY","Score":null,"Total":0}

引用次数: 0

Abstract

A liquid accelerator is a key component in shotcrete; however, it often faces challenges such as high alkali content and insufficient long-term concrete strength. This study utilizes polyaluminum sulfate as the primary raw material to develop an environmentally friendly, alkali-free, and fluorine-free accelerator (FAF). Through orthogonal experiments and cement compatibility tests, the effects of FAF on setting time, 1 day compressive strength, and 28 days compressive strength ratio of cement paste were analyzed, leading to the determination of the optimal FAF mixing ratio. The coagulation-promoting mechanism of FAF was further examined using X-ray diffraction (XRD) and scanning electron microscopy (SEM) results. Additionally, concrete slab tests were conducted to assess the impact of different FAF dosages on concrete rebound rates and mechanical properties, with the optimal dosage range found to be 4–8%. Field trials indicated that, at a 6% FAF dosage, shotcrete rebound rates on tunnel arch walls and roofs were 10.3% and 13.5%, respectively. The composition of the FAF does not contain alkali metal salts, which reduces the risk of alkali-aggregate reactions in concrete and minimizes the potential health risks to construction personnel, aligning with the global trend towards sustainable construction practices.

Abstract Image

查看原文本刊更多论文

液体促进剂是喷射混凝土的关键成分，但它经常面临碱含量高、混凝土长期强度不足等挑战。本研究利用聚合硫酸铝作为主要原料，开发出一种环保、无碱、无氟的促进剂（FAF）。通过正交实验和水泥相容性测试，分析了 FAF 对水泥浆凝结时间、1 天抗压强度和 28 天抗压强度比的影响，从而确定了 FAF 的最佳掺量。利用 X 射线衍射（XRD）和扫描电子显微镜（SEM）结果进一步研究了 FAF 的促凝机理。此外，还进行了混凝土板试验，以评估不同 FAF 掺量对混凝土回弹率和机械性能的影响，结果发现最佳掺量范围为 4-8%。现场试验表明，FAF 用量为 6% 时，隧道拱墙和拱顶的喷射混凝土回弹率分别为 10.3% 和 13.5%。FAF 的成分不含碱金属盐，可降低混凝土中发生碱-骨料反应的风险，并将施工人员的潜在健康风险降至最低，符合全球可持续建筑实践的发展趋势。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Materials and Structures 工程技术-材料科学：综合

CiteScore

6.40

自引率

7.90%

发文量

222

审稿时长

5.9 months

期刊介绍： Materials and Structures, the flagship publication of the International Union of Laboratories and Experts in Construction Materials, Systems and Structures (RILEM), provides a unique international and interdisciplinary forum for new research findings on the performance of construction materials. A leader in cutting-edge research, the journal is dedicated to the publication of high quality papers examining the fundamental properties of building materials, their characterization and processing techniques, modeling, standardization of test methods, and the application of research results in building and civil engineering. Materials and Structures also publishes comprehensive reports prepared by the RILEM’s technical committees.