INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Performance Research on New Subgrade Stabilized Materials Prepared by Waste Brick Powder and Sulfur-fixing Ash |
ZHANG Rui1, LIU Wenhuan1,2, ZHANG Hao1, LI Hui1,2,3
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1 College of Materials Science and Engineering, Xi'an University of Architecture & Technology, Xi'an 710055, China 2 Shaanxi Ecological Cement & Concrete Engineering Technology Research Center, Xi'an 710055, China 3 Ecological Cement Engineering Research Center of Ministry of Education, Xi'an 710055, China |
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Abstract In this work, waste brick powder and circulating fluidized bed solid sulfur ash are used to prepare a new roadbed stabilization material synergistically, and its mechanical, shrinkage and frost resistance properties were systematically studied. The results show that the 7 d unconfined compressive strength of the new roadbed material is better than that of the lime-fly ash reference sample, under the experimental ratios designed according to the requirements of m(brick dust): m (fly ash)=1∶2—1∶4 and m(binding material): m(mixture)=20∶80—15∶85, and the mechanical properties and durability of the roadbed stabilization material show a trend of increasing and then decreasing with the increase of brick dust dosing, but they are better than the standard specified values. When the brick dust dosing is 30% and the stable sulfur ash dosing is 70% (both are mass fractions), the mechanical, shrinkage and freeze-thaw properties of new roadbed stabilization materials were optimal. XRD SEM and TGA methods were used to analyze the mineral composition, microstructure and thermal weight loss characteristics of each scheme's new roadbed materials' hydration products, and the synergistic mechanism of multi-solid waste was studied. The results show that the hydration products generate in the new roadbed materials prepared by the synergistic sulfur ash fixation of brick powder were as follows: ettringite, calcium silicate hydrate and calcium carbonate; these hydration products provide strength for new road base stabilization materials.
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Published: 25 June 2022
Online: 2022-06-24
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Fund:Yulin Science and Technology Plan Project(CXY-2020-059). |
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