Carbon Fixation Characteristics and Performance Enhancement of CO2 Mineralized All-solid Waste Alkali-activated Cementitious Materials

doi:10.12096/j.2096-4528.pgt.22084

Abstract

Abstract:

CO₂ mineralized all-solid waste alkali-activated cementitious materials can not only realize the storage of CO₂ mineralized, but also shorten the curing cycle of alkali-activated cementitious materials and improve their compressive strength. It is a promising way of CO₂ capture and utilization. The effects of the ratio of alkali-activated cementitious materials, mineralized curing pressure and mineralized curing time on the carbon fixation rate and compressive strength of CO₂ mineralized cementitious materials were studied. The results show that the calcium carbide slag as alkali activator is more suitable for mineralization curing, and the sample with the highest Ca/Si ratio has the best carbon fixation ability under the same curing condition. Increasing the curing pressure and curing time of CO₂ can improve the properties of the samples. Physical and chemical characterization test results show that, the microstructure of the mineralized samples is more compact than that of the natural curing samples, and the calcite-type calcium carbonate produced in the curing process is helpful to increase the compressive strength of the material. The research results provide basic data and reference for the development of CO₂ mineralization curing technology of all-solid waste alkali-activated cementitious materials.

Key words: carbon capture, utilization and storage (CCUS), alkali-activated cementitious materials, mineralization curing, carbide slag, CO₂ storage

CLC Number:

TK 09

Xiao KONG, Chuanwen ZHAO, Jian SUN, Yafei GUO, Yue PAN, Ping LU. Carbon Fixation Characteristics and Performance Enhancement of CO₂ Mineralized All-solid Waste Alkali-activated Cementitious Materials[J]. Power Generation Technology, 2022, 43(4): 600-608.

Figures/Tables 12

Tab.1 Chemical composition of raw materials

样品名称	各成分质量分数/%
样品名称	CaO	SO₃	MgO	P₂O₅	Fe₂O₃	SiO₂	Al₂O₃	LOI	其他
脱硫渣	73.28	5.00	2.38	0.013	0.74	0.80	0.27	19.05	7.54
电石渣	70.58	—	0.98	—	—	2.45	—	23.37	2.05
矿渣	39.53	0.05	10.42	—	0.01	30.41	15.06	0.01	4.50
粉煤灰	6.23	1.38	—	—	11.60	45.87	22.97	5.78	6.71
钢渣	33.68	—	5.85	1.540	30.09	14.41	3.71	2.59	4.83

Tab. 2 Ingredients for alkali-activated cementitious materials

试块	激发剂种类	碱激发剂质量/kg	矿渣质量/kg	粉煤灰质量/kg	河砂质量/kg	钢渣质量/kg	水胶比	钙硅比
DS-1	脱硫渣	3.6	3	0.6	1.2	3.6	0.50	2.28
CS-1	电石渣	3.2	3	0.6	1.2	4.0	0.50	2.08
CS-2	电石渣	3.6	3	0.6	1.2	3.6	0.50	2.18
CS-3	电石渣	4.2	3	0.6	1.2	3.0	0.50	2.35

Fig. 1 Preparation process of test specimen

Fig. 2 Experimental setup of mineralization reaction

Fig. 3 XRD analysis of alkali-activated cementitious materials

Fig. 4 Electron microscope images of alkali-activated cementitious material specimen

Fig. 5 Carbon sequestration rate after curing under different ratios

Fig. 6 Carbon fixation rate of mineralized curing under different pressures

Fig. 7 Carbon fixation rate of specimens under different mineralized curing times

Fig. 8 Compressive strength of natural curing and mineralized curing with different ratios

Fig. 9 Effect of different mineralized curing pressures on compressive strength

Fig. 10 Effect of different mineralized curing times on compressive strength

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Carbon Fixation Characteristics and Performance Enhancement of CO₂ Mineralized All-solid Waste Alkali-activated Cementitious Materials

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