Investigation of mechanical properties and hydration of low-carbon magnesium and calcium-rich waste powder geopolymer paste

被引:0
|
作者
Li, Changming [1 ,2 ]
Yang, Xudong [1 ]
Jia, Dongyang [1 ]
Zhao, Shunbo [2 ]
Liu, Guanfeng [1 ]
Wang, Yaozong [1 ]
Li, Wanjiao [3 ]
Song, Wenyu [4 ,5 ]
机构
[1] North China Univ Water Resource & Elect Power, Zhengzhou 450045, Peoples R China
[2] North China Univ Water Resources & Elect Power, Int Joint Res Lab Ecobldg Mat & Engn Henan, Zhengzhou 450045, Peoples R China
[3] Water Resources Res Inst Inner Mongolia Autonomous, Hohhot 010020, Peoples R China
[4] Guangdong GW Met Ind Grp Co LTD, Guangzhou 510050, Peoples R China
[5] Yunfu Hongyuan Green Bldg Mat Co LTD, Yunfu 527300, Peoples R China
基金
中国国家自然科学基金;
关键词
Low carbon; Magnesium and calcium-rich waste powder; Geopolymer paste; Mechanical properties; Microstructure; ALKALI-ACTIVATED SLAG; DOLOMITE; MICROSTRUCTURE; DURABILITY;
D O I
10.1016/j.jcou.2024.102984
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Magnesium and calcium-rich waste powder (MWP) has the potential to be a low-carbon geopolymer cementitious material. This study investigates the mechanical properties and hydration products of low-carbon magnesium and calcium-rich waste powder geopolymer paste (LMWP). The influences of alkali content, calcination temperature, mix proportions of raw materials and curing temperature on the compressive strength and hydration of LMWP were examined. The mechanical properties of LMWP were systematically evaluated by assessing setting time, fluidity, and compressive strength, while the pore structure was analyzed using mercury intrusion porosimetry (MIP). The hydration products and microstructures of LMWP were investigated by XRD, TG-DTG, and SEM-EDS. The results indicated that incorporating 1 % NaOH significantly enhanced the compressive strength of LMWP, whereas thermally activated MWP (800 degrees C, 900 degrees C) negatively affected compressive strength development. The addition of slag facilitated the reaction of MWP and improved the compressive strength of LMWP. When the slag incorporation reached 40%, the specimen demonstrated optimal performance with a compressive strength of 27.8 MPa. The pore diameter was predominantly distributed around 10 nm, indicating well-structured porosity. Microstructural analysis revealed that the hydration products are dense calcium magnesium silicate gels (C-M-S-H), which significantly enhanced the compressive strength and optimized pore structure of LMWP. The efficiency of carbon emission reduction achieved by LMWP was evaluated. The findings indicate that, compared to traditional cement-based materials, LMWP reduces cement consumption by over 60 %, significantly decreasing CO2 emissions. This study innovatively utilizes MWP to prepare green and low-carbon geopolymer paste materials, with the aim of replacing cement applications in the construction industry, thereby reducing carbon emissions. It explores new avenues for the low-carbon and green development of the civil engineering sector and contributes to efforts in addressing the global climate crisis.
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页数:14
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