Porosity-Cement Ratio Controlling Strength of Artificially Cemented Clays

Consoli, Nilo César; Rosa, Amanda Dalla; Corte, Marina Bellaver; Lopes, Luizmar da Silva; Consoli, Bernardo Scapini

doi:10.1061/(asce)mt.1943-5533.0000283

Cited by 57 publications

(23 citation statements)

References 7 publications

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“…Even a relatively highly porous quartz-bound sandstone will be stronger than a fully indurated sulfate-bound sandstone (Bernabé et al, 1992). Where cement minerology remains constant, porosity has the greatest effect on the strength (Carey et al, 2017;Consoli et al, 2011). The sedimentary composition at Gale crater is basaltic; concentrations of silica available for quartz induration and the necessary aqueous processes are considerably less active when compared to Earth.…”

Section: Resultsmentioning

confidence: 99%

Uniaxial Compressive Strengths of Rocks Drilled at Gale Crater, Mars

Peters

Carey

Anderson

et al. 2018

Geophysical Research Letters

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Measuring the physical properties of geological materials is important for understanding geologic history. Yet there has never been an instrument with the purpose of measuring mechanical properties of rocks sent to another planet. The Mars Science Laboratory (MSL) rover employs the Powder Acquisition Drill System (PADS), which provides direct mechanical interaction with Martian outcrops. While the objective of the drill system is not to make scientific measurements, the drill's performance is directly influenced by the mechanical properties of the rocks it drills into. We have developed a methodology that uses the drill to indicate the uniaxial compressive strengths of rocks through comparison with performance of an identically assembled drill system in terrestrial samples of comparable sedimentary class. During this investigation, we utilize engineering data collected on Mars to calculate the percussive energy needed to maintain a prescribed rate of penetration and correlate that to rock strength.

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Section: Resultsmentioning

confidence: 99%

Uniaxial Compressive Strengths of Rocks Drilled at Gale Crater, Mars

Peters

Carey

Anderson

et al. 2018

Geophysical Research Letters

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“…Rattley et al, 2008;Consoli et al, 2009). Previous studies of soil-cement (Moore et al, 1970;Clough et al, 1981;Consoli et al, 2010Consoli et al, , 2011 have shown that its behaviour is complex, and affected by many factors, such as the physical-chemical properties of the soil, the amount of cement, and the porosity and moisture content at the time of compaction. Consoli et al (2007) were the first to establish a unique dosage methodology based on rational criteria where the porosity/cement ratio plays a fundamental role in assessment of the target unconfined compressive strength.…”

mentioning

confidence: 99%

Parameters controlling stiffness and strength of artificially cemented soils

Consoli¹,

Fonseca²,

Silva³

et al. 2012

Géotechnique

127

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The treatment of soils with cement is an attractive technique when a project requires improvement of the local soil for the construction of subgrades for rail tracks, for roads, as a support layer for shallow foundations, and to prevent sand liquefaction. This paper advances understanding of the key parameters for the control of strength and stiffness of cemented soils by testing two soils with different gradings and quantifying the influence of porosity/cement ratio on both initial shear modulus (G 0 ) and unconfined compressive strength (q u ). It is shown that the porosity/cement ratio is an appropriate parameter to assess both the initial stiffness and the unconfined compressive strength of the soil-cement mixtures studied. Each soil matrix has a unique relationship for G 0 /q u against adjusted porosity/cement ratio, linking initial stiffness and strength.KEYWORDS: compaction; ground improvement; laboratory tests; sands; soil stabilisation; stiffness Le traitement des sols au ciment est une technique attrayante pour les projets nécessitant un renforcement du sol pour la construction d'assiettes pour voies ferrées et chaussées, comme couche d'appui pour fondations peu profondes, et pour la prévention de la liquéfaction du sable. La présente communication renforce les connaissances sur les principaux paramètres pour la régulation de la résistance et de la rigidité des sols cimentés, en soumettant à des essais deux sols de différentes granulométries, et en quantifiant l'influence du ratio porosité / ciment à la fois sur le module de cisaillement initial (G 0 ) et sur la résistance à la compression simple (q u ). On y montre que le ratio porosité /ciment est un paramètre approprié pour évaluer à la fois la rigidité initiale et la résistance à la compression simple des mélanges solciment étudiés. Chaque matrice de sol présente un G 0 /q u unique en fonction du ratio porosité /ciment, mettant en rapport la rigidité initiale et la résistance. INTRODUCTIONIn highway and other shallow constructions, cement is often used to improve local soils, for example to make them suitable as subgrades, formations and foundation backfill (e.g. Rattley et al., 2008;Consoli et al., 2009). Previous studies of soil-cement (Moore et al., 1970;Clough et al., 1981;Consoli et al., 2010Consoli et al., , 2011 have shown that its behaviour is complex, and affected by many factors, such as the physical-chemical properties of the soil, the amount of cement, and the porosity and moisture content at the time of compaction. Consoli et al. (2007) were the first to establish a unique dosage methodology based on rational criteria where the porosity/cement ratio plays a fundamental role in assessment of the target unconfined compressive strength.This study shows the influence of the amount of cement and the porosity on the initial shear modulus (G 0 ) and unconfined compressive strength (q u ) of two different soils: uniform Osorio sand and very well-graded Porto silty sand. EXPERIMENTAL PROGRAMME MaterialsThe results of characterisation tests on t...

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“…An automatic loading machine with maximum capacity of 50 kN and a proving ring with capacity of 10 kN and resolution of 0.005 kN were used for the splitting tensile tests. After curing in the humid room, the specimens were submerged in a water tank for 24 h for saturation to minimize suction (Consoli et al, 2011). The water temperature was controlled and maintained at about 20°C, following Brazilian standard NBR 7222 (ABNT, 1983).…”

Section: Splitting Tensile Testsmentioning

confidence: 99%

“…Five different cementitious material quantities: 75 kg/m 3 , 125 kg/m 3 , 175 kg/m 3 , 225 kg/m 3 and 275 kg/m 3 were chosen following international and Brazilian experience (Mitchell, 1981;Consoli et al, 2011) and 7, 28 and 90 days of curing at 23°C ± 2°C. Because of the typical scatter of data for the strength tests, a minimum of three specimens (for both tensile and compression) were tested for each point.…”

Section: Program Of Splitting Tensile Unconfined Compression and Embmentioning

confidence: 99%

“…This practice has been widely used, as described by Lin and Wong (1999), Andromalos et al (2001) and Hussin and Garbin (2012). The research group at Federal University of Rio Grande do Sul, Brazil (e.g., Thomé et al, 2005;Consoli et al, 2008Consoli et al, , 2009aConsoli et al, ,b,c, 2010Consoli et al, , 2011Consoli et al, , 2012Consoli et al, , 2013aConsoli et al, ,b, 2014aFestugato et al, 2013;Faro et al, 2015) has been studying key parameters dictating strength and stiffness of lime/cement treated soils.…”

Section: Introductionmentioning

confidence: 99%

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