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论文类型：期刊论文

发表时间：2017-07-30

发表刊物：CONSTRUCTION AND BUILDING MATERIALS

收录刊物：SCIE、EI、Scopus

卷号：144

页面范围：484-492

ISSN号：0950-0618

关键字：Yellow River silt; Artificial flood-prevention stone; Alkali-activation; Compressive strength; Frost resistance

摘要：In the Yellow River Basin, the source of flood-prevention tone is scarce. The purpose of this study is to investigate the feasibility of producing a kind of artificial flood-prevention stone by using Yellow River silt via alkali-activated method. The effects of alkali dosage, slag content and curing age on the compressive strength of artificial flood-prevention stone were studied. The results showed that the specimen made from optimal mix proportion can meet the requirement of flood-prevention stone. The main product in alkali-activated process is C-S-H gel confirmed by microcosmic tests such as SEM/EDS, TG/DTG and so on. CaCO3 is generated by the carbonation of partial C-S-H gel and residual Ca(OH)(2). C-S-H gel and CaCO3 have common contribution to strength. In addition, frost resistance of the artificial flood prevention stone at the age of 90 days was evaluated by freeze-thaw cycle method. The porosity and pore size distribution were tested by Mercury intrusion porosimetry (MIP) to explicate the change before and after freeze-thaw cycle. As a whole, it is feasible to produce artificial flood-prevention stone by using the Yellow River silt. (C) 2017 Elsevier Ltd. All rights reserved.