Abstract
In this study, a clayey soil classified as A-7-5 according ASTM D3282, was stabilized using alkali-activated cementitious materials (AAC) added to the soil dry in percentages of 20 and 30%. Fly ash (F1, F2) with high unburned carbon content (up to 38.76%), hydrated lime (L) and granulated blast furnace slag were used. Unconfined compressive strength and flexural strength at 28 days of curing and the durability after 12 wetting-drying cycles were evaluated. The results were compared with a soil-cement reference mixture. The soil treated with AAC-F1L showed a volume expansion of 0.51% and volume contraction of -0.57% compared with the 0.59% expansion and -0.68% contraction of the soil-cement reference mixture. Additionally, the mass loss after the wetting and drying cycles is only 3.74% which is slightly lower than the mass loss of the soil stabilized with ordinary Portland cement (OPC) (3.86%) and well below the value specified in Colombian regulations (7%).
Highlights
RESUMEN: Estabilización de suelo arcilloso utilizando materiales cementicios activados alcalinamente
This study reported that the soil stabilized with ground granulated blast-furnace slag (GGBS) had the best properties in terms of mechanical strength and durability; the authors suggested that soils stabilized with GGBS-pulverized fly ash (PFA) and GGBS-red gypsum (RG), from an engineering standpoint, can be used in applications where high stiffness is not required to prevent fracture of the stabilized soil
The addition of ordinary Portland cement (OPC) as stabilizer increases the maximum dry density (MDD) to 1.59 g/cm3 with an optimum moisture content (OMC) of 26.15%; this phenomenon is related to the addition of a material of higher specific weight to the mixture, and the increase in the moisture content is attributed to the additional water the OPC requires to begin the hydration processes [22]
Summary
The soil used was collected in southern Cali, Valle del Cauca, Colombia, at latitude 3° 21’ 45.979’’N and longitude 76° 30’ 53.277’’W. It was initially dried at ambient temperature, and a disc mill was used to de-flocculate the particles. The particle size distribution was determined by sieving, according to ASTM D6913-17 [13], the sieved material showed a very fine texture with 96.75% of the material passed through sieve number 200. These results were used to classify the soil as a A-7-5 according to ASTM D3282-15 [15]. A NaOH/Na2SiO3 combination, in solution form, was used as the alkaline activator
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