Applicability of molding procedures in laboratory mix tests for quality control and assurance of the deep mixing method

Kobayashi, Masaki; Grisolia, M.; Leder, Enrico; Marzano, Ignazio Paolo; Correia, António Alberto S.; Oliveira, Paulo J. Venda; Åhnberg, Helen; Andersson, Mattias

doi:10.1016/j.sandf.2015.06.009

Cited by 41 publications

(7 citation statements)

References 6 publications

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“…The presence of tricalcium sulphate (C 3 S) added to the cement clinker during its production is what enhances the early strength development. Undoubtedly, cement-soil mixing techniques have been widely employed in the construction field for strength enhancement and improved compressibility (Farouk and Shahien 2013;Gaafer et al 2015) and the beneficial outcome on the performance of cement-treated soils has been extensively documented in literature (Praticò and Puppala 2012;Åhnberg et al 2001;Kitazume et al 2015;Pakbaz and Alipour 2012). The application of cement in treatment of weak and problematic soils have resulted in improved performance such as reduction in plasticity and swell potential, substantial strength gain, increase in elastic modulus and resistance against the influence of moisture.…”

Section: Introductionmentioning

confidence: 99%

Swell and microstructural characteristics of high-plasticity clay blended with cement

Abbey

Eyo

Ngambi

2019

Bull Eng Geol Environ

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This study presents the effect of high plasticity on swell potential, swelling pressure and micro-structural characteristics of kaolinite-bentonite mixed clays. Five different mix ratios of kaolinite bentonite mixture of 100:0, 90:10, 75:25, 50:50 and 25:75 in % by weight of dry kaolinite were used. All five synthesised soils were then mixed with 0%, 5% and 8% of cement by weight of dry soil, cured for 28 days and subjected to the Atterberg limit, one-dimensional oedometer and scanning electron microscope test. The inclusion of 5% and 8% cement reduces the plasticity index of the treated soils as the percentage of bentonite increases. The effects on plasticity of treatment with 5% and 8% cement after a 28-day curing period was evaluated, and the results show that reduction in plasticity index resulted in decreased swell potential and swelling pressure of the kaolinitebentonite mixed clays. The results of microstructural analysis of 5% cement-treated soils show formation of flocculated fabric and cementation of soil particles, and filling with cementitious compounds of the voids of flocculated fabric in the soil. The reduction in swell can be attributed to the resulting compacted and dense mass of treated soils due to cementation of soil particles and cation exchange. The complex swell behaviour of high-plasticity kaolinite-bentonite mix is explained using the onedimensional oedometer test, by further experimental study and examination of the microstructure of treated soils.

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Section: Introductionmentioning

confidence: 99%

Swell and microstructural characteristics of high-plasticity clay blended with cement

Abbey

Eyo

Ngambi

2019

Bull Eng Geol Environ

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“…Laboratory mix test. To determine a suitable content of binder to ensure the design strength 27 , laboratory mix test was carried out on 3-1 silty clay loam prior to the field test. Cement-stabilized soil specimens with cement content of 14%, 16% and 18% and water cement ratios of 0.45, 0.50 and 0.55 were prepared.…”

Section: Methodsmentioning

confidence: 99%

Quality assessment and quality control of deep soil mixing columns based on a cement-content controlled method

Zuo

Wang

et al. 2023

Sci Rep

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This paper presents a cement-content controlled method for quality assessment and quality control of the deep soil mixing (DSM) columns in slope reinforcement. The ethylene diamine tetraacetic acid (EDTA) titration method was modified and used for the cement content measurement of core samples, and the effects of curing conditions and curing period on the titration results were investigated. 35 DSM columns with different construction parameters were installed in the test section, and cement content and unconfined compression tests of field core samples were conducted. The relationship between the unconfined compressive strength (UCS) and cement content of DSM columns was formulated, and the quality of DSM columns with different construction parameters was assessed. The test results suggested that the failure strength of the field cores was approximately 15–55% lower than that of laboratory samples with the same cement content. In single columns, the coefficient of variation (CV) of cement content had a negative correlation with the average failure strength and a positive correlation with the coefficient of variation of failure strength. Bidirectional mixing method, lower penetration and withdrawal velocity, more mixing blades and larger number of mixings could improve the uniformity of the DSM columns.

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“…Orthogonal range analysis and the trend charts of wet unit weight (provided in the Annex File) show that the PG/B ratio has the most significant effect on the wet unit. Kitazume et al [38] has demonstrated that strength ratio increased with the wet unit weight ratio in soil and Portland cement mixture. Therefore, it seems that the PG/B ratio influences the mechanical performance of the backfill samples by affecting both the physical properties and the cementitious products.…”

Section: Effects Of Slurry Preparation On Unconfined Compressive Strementioning

confidence: 97%

Slurry Preparation Effects on the Cemented Phosphogypsum Backfill through an Orthogonal Experiment

Zhou

Zhu

et al. 2019

Minerals

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The cemented phosphogypsum (PG) backfill technique provides a new method for massive consumption of PG, and therefore alleviating the environmental pollution of PG. This study considered the effects of slurry preparation on the performance of cemented PG backfill. A L 16 (4 4 ) orthogonal experiment was designed to analyze four factors, namely the solid content, phosphogypsum-to-binder ratio (PG/B ratio), stirring time and stirring speed, with each factor having four levels. According to the range analysis, the solid content played the dominant role in controlling the bleeding rate, while the setting times strongly depended on the PG/B ratio. In terms of strength development of the backfill, the PG/B ratio was shown to be the most significant factor determining the unconfined compressive strength (UCS), followed by the solid content, stirring time and stirring speed. Furthermore, the results showed that the slurry preparation affected the environmental behavior of impurities that originated in PG. By analyzing the concentrations of impurities in the bleeding water of the slurry as well as the leachates of the tank leaching test, the results showed that the release of F − and SO 4 2− was aggravated clearly with the increase in the PG/B ratio, while the release of PO 4 3− always remained at relatively low levels.

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Applicability of molding procedures in laboratory mix tests for quality control and assurance of the deep mixing method

Cited by 41 publications

References 6 publications

Swell and microstructural characteristics of high-plasticity clay blended with cement

Swell and microstructural characteristics of high-plasticity clay blended with cement

Quality assessment and quality control of deep soil mixing columns based on a cement-content controlled method

Slurry Preparation Effects on the Cemented Phosphogypsum Backfill through an Orthogonal Experiment

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