Study on the properties of artificial flood-prevention stone made by Yellow River silt. (30th July 2017)

• Record Type: Journal Article
• Authors: Wang, Baomin; Li, Gaonian; Han, Junnan; Zheng, Yue; Liu, Hui; Song, Wanzeng
• Is Part Of: Construction & building materials. Volume 144(2017)
• Page Start: 484
• Page End: 492
• Publication Date: 2017-07-30
• Subjects: Yellow River silt -- Artificial flood-prevention stone -- Alkali-activation -- Compressive strength -- Frost resistance; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2017.03.206
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: Yellow River silt has a certain activity, whose activity rate is 20.44%. The addition of slag enhanced the strength of artificial flood-prevention stone. The optimal mix proportion was achieved when using the compound alkali-activator. C-S-H gel is the main alkali-activated product of artificial flood-prevention stone. Abstract: 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.