CUED Publications database

Durability of reactive magnesia-activated slag-stabilized low plasticity clay subjected to drying-wetting cycle

Du, YJ and Bo, YL and Jin, F and Liu, CY (2016) Durability of reactive magnesia-activated slag-stabilized low plasticity clay subjected to drying-wetting cycle. European Journal of Environmental and Civil Engineering, 20. pp. 215-230. ISSN 1964-8189

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Abstract

© 2015 Taylor & Francis. The strength characteristics and hydration products of reactive magnesia (MgO)-activated ground-granulated blast-furnace slag (GGBS) cement and concrete have been extensively investigated in previous studies. However, very limited study has comprehensively investigated the impacts of drying-wetting cycle on the engineering properties of GGBS-MgO-stabilised soils. This paper presents details of a study dealing with the influences of drying-wetting cycle on the dry density, pH, unconfined compressive strength (q u ) and secant modulus (E 50 ) of GGBS-MgO-stabilised kaolin clay. For the purpose of comparison, the conventional Portland cement (PC)-stabilised kaolin clay is selected as a control sample. Several series of and drying-wetting durability and unconfined compression tests were conducted for the stabilised soils. The variations in dry density, mass loss, pH, q u and E 50 with drying-wetting cycle are discussed. The results show that the GGBS-MgO-stabilised kaolin clay display higher dry density (∼1-7%) and lower mass loss (∼10-30%) than the PC-stabilised kaolin clay. The pH values and q u of the GGBS-MgO-and PC-stabilised kaolin clay decrease with the increase of drying-wetting cycle. When cured for 93-120 days under the controlled temperature of 20 °C and relative humidity of 95%, the GGBS-MgO-stabilised kaolin clay exhibits higher (∼1.5 times) q u than the PC-stabilised kaolin clay. However, when the drying-wetting cycle exceeds forth, the GGBS-MgO-stabilised kaolin clay displays lower q u or E 50 than the PC-stabilised kaolin clay. The measured soil pH has a good linear relationship with q u of the soils that experienced drying-wetting durability tests. Finally, the mechanisms underneath the gradual loss of q u or E 50 with increasing drying-wetting cycle are discussed.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div D > Geotechnical and Environmental
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:25
Last Modified: 17 May 2018 07:57
DOI: