Utilization of chromium-rich decarbonized coal gasification slag as mineral admixture in cemented mortar: Mechanical performance, hydration property and chromium immobilization

IF 7.4 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Construction and Building Materials Pub Date : 2025-02-28 DOI:10.1016/j.conbuildmat.2025.140614

Xiaochuan Xu , Yunqi Zhao , Xiaowei Gu

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引用次数: 0

Abstract

The utilization of aluminosilicate-rich by-products as supplementary cementitious materials has garnered great interest due to its environmental friendliness. In this study, a Cr-rich decarbonized coal gasification slag powder (DGSP) was conducted to reduce the large-scale application of cement, and hazardous heavy metal element was solidified simultaneously. Fluidity, setting time and compressive strength tests were carried out to evaluate macro-performances. Hydration calorimetry, X-ray diffraction, thermogravimetry and scanning electron microscope-energy dispersive spectrometer were used analyzed the property of hydration. Results showed that the hydration heat and early compressive strength were deteriorated with DGSP content due to its restricted reactivity. However, after 28 d and 90 d curing, the reticular C(-A)-S-H was mainly generated through pozzolanic reaction of DGSP, and interfacial transition zone was attenuated. The compressive strength of blended mortar was increased first and then decreased, and peaked at 30 wt% DGSP, where Cr leaching in DGSP was also restrained by 98.5 % through the physical solidification of C(-A)-S-H and chemical stabilization of CrO₄-U phase. The achievement of this study proved the feasibility of this decarbonized coal gasification slag powder in cementitious binders.

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来源期刊

Construction and Building Materials 工程技术-材料科学：综合

CiteScore

13.80

自引率

21.60%

发文量

3632

审稿时长

82 days

期刊介绍： Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged. Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.