Experimental Study on Carbonation Durability of Kaolin Strengthened with Slag Portland Cement
Qingbiao Wang,
Yiming Ma,
Fuqiang Wang,
Zhenyue Shi,
Hongyue You,
Yuanyuan Tian,
Yunfei Liu,
Zhongjing Hu,
Hongxu Song,
Dong Wang,
Yueqiang Sun,
Rongshuai Yang,
Haoran Sun
Affiliations
Qingbiao Wang
College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Yiming Ma
College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Fuqiang Wang
College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
Zhenyue Shi
College of Safety and Environmental Engineering (College of Safety and Emergency Management), Shandong University of Science and Technology, Qingdao 266590, China
Hongyue You
College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
Yuanyuan Tian
College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
Yunfei Liu
College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Zhongjing Hu
College of Safety and Environmental Engineering (College of Safety and Emergency Management), Shandong University of Science and Technology, Qingdao 266590, China
Hongxu Song
College of Energy and Mining Engineering, Shandong University of Science and Technology, Qingdao 266590, China
Dong Wang
College of Civil Engineering and Architecture, Shandong University of Science and Technology, Qingdao 266590, China
Yueqiang Sun
College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Rongshuai Yang
College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Haoran Sun
College of Resources, Shandong University of Science and Technology, Tai’an 271019, China
Slag Portland cement is an environmentally friendly and energy-saving product, which is widely used in cement-reinforced soil. This study used slag Portland cement-reinforced soil as the research object and P.O 42.5 + kaolin (POK) as the reference group. The carbonation depth and strength of P.S.A 42.5 + kaolin (PSK) at different curing times were analyzed using carbonation depth, uniaxial ground pressure strength, scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The test results show the following: (1) The active substances in PSK samples can react with calcium hydroxide produced during cement hydration and can reduce the content of OH−. The PSK samples react with OH− and CO2 in the carbonation environment. Both processes considerably reduce the content of OH−. (2) Due to the decrease in OH− content, the carbonation durability of slag Portland cement-reinforced soil is significantly less than that of ordinary Portland cement. (3) The carbonation of slag Portland cement-reinforced soil improves its strength. (4) The results of SEM + EDS and XRD confirm the carbonation depth and strength of the POK and PSK samples. The results show that PSK has important applications in subgrade or building grouting materials and in cement-soil mixing piles (walls).
