Characterization of Soil Treated With Alkali-Activated Cement in Large-Scale Specimens

N. Cruz, S. Rios, E. Fortunato, C. Rodrigues, J. Cruz, C. Mateus, C. Ramos
2017 Geotechnical Testing Journal  
33 Soil improvement with hydraulic binders is currently used in practice due to the advantages of 34 using the local soil enhancing its geotechnical properties. However, environmental issues 35 related to quicklime applications and carbon dioxide emissions associated to Portland cement 36 production encouraged the development of new binders. In this work, alkaline activated cement 37 (AAC) synthetized by fly ash and an alkaline solution was used to stabilize a silty sand. The 38 behavior of the
more » ... 38 behavior of the treated soil was evaluated performing tests on a physical model and the results 39 were compared to laboratory data to define its compaction, strength and stiffness properties. 40 Those tests include nuclear density gauge measurements, light falling weight deflectometer 41 tests, and plate load tests, while unconfined compression tests with unload-reload cycles and 42 seismic wave measurements were performed at the laboratory. These tests, very common in 43 current geotechnical practice, have proved to be also adequate to quality control and to evaluate 44 the geomechanical properties of this material. The results at 28 days show a significant 45 improvement given by the AAC, but still some sensitivity to water when flooded. The 46 comparison of results from different tests provided the evolution of stiffness with strain level. 47 48 49 50 51 52 Keywords: Fly-ash, alkali activated cement, soil improvement, physical model, real scale 53 demonstration, controlled condition chamber 54 55
doi:10.1520/gtj20160211 fatcat:zwm3kqzulfgujacewn2tu2x2ta