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夏 雨^1,2，高 妮^1,2，王永維^1,2，劉競怡^1,2，何文敏^1,2

（1陜西省高性能混凝土工程實驗室，陜西 渭南 714000；

2 陜西鐵路工程職業技術學院 測繪與檢測學院，陜西 渭南 714000）

摘 要：研究了大體積混凝土中粉煤灰和礦粉在熱養護條件下對水泥早期抗壓強度的影響，并通過水化熱、XRD以及TGA等技術手段闡述了水化反應過程。結果表明，常溫時，粉煤灰和礦粉加入均會大幅度降低早期強度；熱養護時，粉煤灰-水泥體系的早期強度仍遠低于空白組；但隨著礦粉用量的增加和熱養護溫度的升高，體系早期強度與空白組的差距逐漸減小；50 ℃養護時，礦粉-水泥體系的早期強度高于空白組。這說明在熱激發條件下，粉煤灰的早期火山灰反應仍然有限，但礦粉的早期水化活性顯著提高，通過火山灰反應和自水化反應完成水化產物的積累。

關鍵詞：粉煤灰；礦粉；熱養護；水化過程；水化產物

中圖分類號：U414   

文獻標志碼：A   

文章編號：1005-8249（2024）01-0006-07

DOI：10.19860/j.cnki.issn1005-8249.2024.01.002

 

XIA Yu^1,2,GAO Ni^1,2,WANG Yongwei^1,2,LIU Jingyi^1,2,HE Wenmin^1,2

（1.Shananxi Engineering Laboratory of High Performance Concrete,Weinan 714000,China;

2.School of Surveying & Testing,Shaanxi Railway Institute,Weinan 714000,China)

Abstract:This paper studied the influence of fly ash (FA) and ground granulated blast furnace slag (GGBS) in mass concrete on the early compressive strength of cement under thermal curing conditions, and discussed the hydration reaction process by hydration heat, XRD and TGA. The results show that the addition of FA and GGBS can greatly reduce the early strength at room temperature; the early strength of FA-cement system is still much lower than that of the blank group during thermal curing; however, with the increase of the amount of GGBS and the thermal curing temperature, the early strength of system is closer and closer to the blank group; the early strength of GGBS-cement system is higher than that of blank group when the curing temperature is 50 ℃. This indicates that under the condition of thermal excitation, the early temperature is 50 ℃. This indicates that under the condition of thermal excitation, the early pozzolanic reaction of fly ash is still limited, but the early hydration activity of mineral powder is significantly improved, and the accumulation of hydration products is completed

through pozzolanic reaction and auto-hydration reaction.

Keywords: fly ash; ground granulated blast furnace slag; thermal curing; hydration process; hydration product

 

 

基金項目：陜西省教育廳2023年度青年創新團隊科學研究計劃項目（23JP027）;陜西鐵路工程職業技術學院科研基金項目（KY2021-67）;陜西鐵路工程職業技術學院中青年科技創新人才（KJRC202103）;陜西鐵路工程職業技術學院科技創新團隊（KJTD202102）。

作者簡介：夏雨（1990—），女，碩士，講師，主要研究方向：新型道路材料。

收稿日期：2023-09-19