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Geomechanics and Engineering
  Volume 19, Number 1, September20 2019 , pages 21-28

Alkali-activated GGBS and enzyme on the swelling properties of sulfate bearing soil
Ansu Thomas, R. K. Tripathi and L. K. Yadu

    Use of cement in stabilizing the sulfate-bearing clay soils forms ettringite/ thaumasite in the presence of moisture leads to excessive swelling and causes damages to structures built on them. The development and use of non-traditional stabilisers such as alkali activated ground granulated blast-furnace slag (AGGBS) and enzyme for soil stabilisation is recommended because of its lower cost and the non detrimental effects on the environment. The objective of the study is to investigate the effectiveness of AGGBS and enzyme on improving the volume change properties of sulfate bearing soil as compared to ordinary Portland cement (OPC). The soil for present study has been collected from Tilda, Chhattisgarh, India and 5000 ppm of sodium sulfate has been added. Various dosages of the selected stabilizers have been used and the effect on plasticity index, differential swell index and swelling pressure has been evaluated. XRD, SEM and EDX were also done on the untreated and treated soil for identifying the mineralogical and microstructural changes. The tests results show that the AGGBS and enzyme treated soil reduces swelling and plasticity characteristics whereas OPC treated soil shows an increase in swelling behaviour. It is observed that the swell pressure of the OPC-treated sulfate bearing soil became 1.5 times higher than that of the OPC treated non-sulfate soil.
Key Words
    soil stabilization; alkali activated ground granulated blast-furnace slag; OPC; enzyme; differential free swell; swell pressure
Ansu Thomas, R. K. Tripathi and L. K. Yadu: Department of Civil Engineering, National Institute of Technology Raipur, Chhattisgargh, India

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