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李茂輝1  ,  陸有軍1  ,  楚京軍2 ,  劉亞娟2 ,  張同生3

( 1 .  北方民族大學(xué) 材料科學(xué)與工程學(xué)院 ，寧夏 銀川 750021 ;  
2.  寧夏賽馬科進(jìn)混凝土有限公司，寧夏 銀川 750021 ;  

3 .  華南理工大學(xué) 材料科學(xué)與工程學(xué)院 ，廣東 廣州 510641)

摘   要： 以堿性鋼渣為研究對象 ，在機械粉磨基礎(chǔ)上 ，采用化學(xué)激發(fā)方式探究堿性鋼渣替代水泥早期強度  變化規(guī)律 ；研究不同種類 、摻量化學(xué)激發(fā)劑對鋼渣活性的作用 ，利用 XRD 、SEM 對鋼渣替代水泥的水化產(chǎn)物進(jìn)  行分析。結(jié)果表明：機械粉磨能夠有效改善鋼渣粒徑中的粗顆粒和細(xì)顆粒含量 ，優(yōu)化顆粒級配 ，最佳粉磨時間  為 20 min;  化學(xué)激發(fā)能夠在機械粉磨上進(jìn)一步提高鋼渣膠凝活性 ， 當(dāng)早強劑摻量為 2. 0% 、芒硝摻量為 3 . 0% 、氫氧化鈉摻量為 1 . 0% 、鋼渣摻量為25% 時效果最佳 ；鋼渣替代水泥主要水化產(chǎn)物是方解石  ( CaCO3  ) 、氫氧鈣 石  (Ca  (OH) 2 ) 、硅酸二鈣  (Ca2 SiO4 )   和 C - S- H 凝膠 ，微觀組織呈現(xiàn)纖維網(wǎng)狀結(jié)構(gòu) ，為力學(xué)性能的提高奠定了基礎(chǔ)。

關(guān)鍵詞：堿性鋼渣 ；化學(xué)激發(fā) ；活性 ；力學(xué)性能 ；微觀組織

中圖分類號：X753    

文獻(xiàn)標(biāo)志碼：A   

文章編號：1005- 8249   (2024)  03- 0025- 06 

DOI：10. 19860/j.cnki.issn1005 - 8249.2024.03 .006

 LI Maohui 1,  LU Youjun1 ,  CHU Jingjun2,  LIUYajuan2,  ZHANG Tongsheng3

1 .School of Materials Science and Engineering , North Minzu University , Yinchuan 750021 , China;

2. Ningxia Saima Kejin Concrete Co. ，Ltd. ，Yinchuan 750001 , China; 

3 .School of Materials Science and Engineering , South China University of Technology , Guangzhou 510641 , China

Abstract : Alkaline steel slag as the research object , the change law of alkaline steel slag cementitious activity was investigated by chemical excitation methods. The effects of different kinds and dosage of chemical activators on the activity of steel slag were studied. Hydration products of cement replaced by steel slag were analyzed by XRD and SEM. The results show that mechanical grinding can effectively improve the content of coarse and fine particles in the steel slag particle size , and optimize the particle gradation. The optimal grinding time is 20 min Ininters Chemical excitation can further improve the cementitious activity of steel slag on the basis of mechanical stimulation , and the best effect is obtained when the self- made early- strengthening agent dosing is 2. 0% , the dosage of mirabilite is 3 . 0% , the dosage of sodium hydroxide is 1 . 0% , and the dosage of steel slag is 25% . The main hydration products of cement replaced by steel slag are calcite ( CaCO3 ) , calcium hydroxide ( Ca ( OH) 2 ) , dicalcium silicate (Ca2 SiO4 ) , and C - S - H gel. The microstructure presents a fiber network structure , which lays the foundation for the improvement of mechanical properties.

Keywords : alkaline steel slag; chemical excitation; activity; mechanical properties; microstructure

 

 

 

*基金項目： 寧夏自治區(qū)重點研發(fā)計劃  (2022BDE02002) ;  北方民族大學(xué)重點項目  (2021 KJCX006) 。

作者簡介：李茂輝  (1988—) ,  男 ， 回族 ，博士 ，副教授 ，研究方向：廢物資源化利用與充填材料開發(fā)研究。 

收稿日期：2023- 02- 16