Investigation of Preparation and Shrinkage Characteristics of Multi-Source Solid Waste-Based Cementitious Materials

被引:5
|
作者
Wu, Xu [1 ,2 ]
Li, Bo [3 ]
Wei, Dingbang [1 ,2 ]
Guo, Fucheng [3 ,4 ]
Ji, Haidong [3 ]
机构
[1] Gansu Transportat Planning Survey & Design Inst Co, Lanzhou 730030, Peoples R China
[2] Gansu Highway Traff Construct Grp Co Ltd, Lanzhou 730000, Peoples R China
[3] Lanzhou Jiaotong Univ, Sch Civil Engn, Lanzhou 730070, Peoples R China
[4] Changan Univ, Key Lab Special Area Highway Engn, Minist Educ, Xian 710064, Peoples R China
基金
中国国家自然科学基金;
关键词
response surface method; multiple solid waste cementitious materials; compressive strength; synergistic reaction; crack resistance; FLY-ASH; SLAG; GEOPOLYMER; TAILINGS;
D O I
10.3390/ma16247522
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Cement-stabilized macadam (CEM-SM) base layers on highways are prone to early shrinkage cracking in extremely cold and arid regions, mainly caused by the large drying shrinkage of traditional cement-stabilized base materials. A multi-component solid waste cementitious material (SWCM) was designed based on the response surface method. The synergistic reaction mechanism of SWCM was analyzed using X-ray diffractometer (XRD), Fourier transform infrared spectroscopy (FT-IR) and thermogravimetric analysis (TG). A shrinkage testing system was developed to evaluate the anti-cracking characteristics of stable macadam using multiple solid waste cementitious materials (SWCM-SM), and the strength growth law and frost resistance were analyzed. The results show that the Box-Behnken response surface model was used to obtain the optimal parameter combination for SWCM, including 60% slag, 30% steel slag, and 10% desulfurization gypsum. The compressive strength and flexural strength of SWCM-SM were 24.1% and 26.7% higher than those of CEM-SM after curing 180 days. The frost resistance of SWCM-SM was basically equivalent to that of CEM-SM, and the dry shrinkage strain of SWCM-SM was reduced by 30.7% compared to CEM-SM. It can be concluded that steel slag and desulfurization gypsum stimulate the hydration reaction of slag, thereby improving the bonding strength. Compared to CEM-SM, SWCM-SM exhibits slower hydration reaction and longer hydration duration, exhibiting characteristics of low early strength and high later strength. The early microstrain of the semi-rigid base layer is mainly caused by the occurrence of early water loss shrinkage, and the water loss rate of SWCM-SM is lower than that of CEM-SM. This study concludes that SWCM has good early crack resistance performance for stabilized crushed stones.
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页数:19
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