Capillary rise, suction (absorption) and the strength development of HBM treated with QD base Geopolymer
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Date
2018
Authors
Bui Van, Duc
Chibuzor Onyelowe, Kennedy
Nguyen, Manh Van
Journal Title
Journal ISSN
Volume Title
Publisher
International Journal of Pavement Research and Technology
Abstract
Test soil sample was investigated and characterized under the laboratory conditions with the
preliminary tests. It was classified as A-2-6 group soil according to the AASHTO classification
method. It was also classified according to USCS as poorly graded (GP) with high clay content
(CH). It was also classified as highly plastic with plasticity index above 17% and expansive. The
soil sample was further treated with synthesized Quarry Dust (QD) base Geopolymer cement
(GPC) at room temperature and the effect of the varying proportions of the GPC added in the
proportions of 2.5, 5, 7.5, 10, 12.5, 15, 17.5, 20, 22.5, 25, 27.5, 30, 32.5, 35, 37.5 and 40% by
weight of solid on the cemented and non-cemented test soils under varying curing time on the
soil capillary rise, suction and strength development parameters (UCS, CBR and MRD) were
investigated. The results obtained showed a consistent reduction in capillary rise and suction
with increased proportion of QD base GPC and an increase in these properties with increased
curing time. But cemented soil showed a slight higher reduction in capillary rise and suction than
the non-cemented soil, but at 15% QDbGPC all the trials have capillary rise below 25%. The
strength development consistently improved with increased proportion of QDbGPC, that at
12.5% GPC, the trials achieved CBR above 30%, a minimum required for a material to be used
as base course material and reduced with prolonged curing time due to loss of strength on
prolonged water absorption. Portland cement has high shrinkage, and less capillary and
absorption tendencies, though it showed lesser values of capillary rise and suction but the
difference between cemented and non-cemented soils is too small that QD base GPC can totally
replace OPC because of the construction properties it exhibits. It also shows that QD base GPC
beyond 40% by weight will keep improving the strength of treated soils and achieve higher
compressive strengths.
Description
Keywords
Capillary Rise, Suction, Modulus of Resilient Deformation, Strength Development, Hydraulically Bound Materials, Quarry Dust, Geopolymer
Citation
D. Bui Van, K.C. Onyelowe, M. Van Nguyen, Capillary rise, suction (absorption) and the strength development of HBM treated with QD base Geopolymer, International Journal of Pavement Research and Technology (2018), doi: https://doi.org/10.1016/j.ijprt.2018.04.003