Field Observation of Long-Term Strength of Cement Treated Soil

Hayashi, Hirochika; Nishikawa, Jun'ichi; Ohishi, Kazuo; Terashi, Masaaki

doi:10.1061/40663(2003)32

Cited by 30 publications

(10 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Longer curing periods also lead to greater strength development in cement-treated soil. Logarithmic models were widely used to predict strength gain over time [4,27]. A shortcoming of a logarithmic model was that it implied indefinite strength increase with time.…”

Section: Cement Bindersmentioning

confidence: 99%

“…Field test results from DSM samples [4,34] and laboratory results from cement-treated soil [27] show significant long-term strength gain (up to 2.1 strength increase over 28 day strengths) well beyond the short term cement hydration phase [35]. This long term strength gain has been attributed to secondary pozzolanic reactions taking place in the soil as a result of the right conditions from cement hydratione.g.…”

Section: Cement Bindersmentioning

confidence: 99%

See 1 more Smart Citation

Cementitious, Pozzolanic And Filler Materials For DSM Binders

2020

View full text Add to dashboard Cite

Deep Soil Mix (DSM) is a proven method of ground improvement for deeper underlying soft soil layers which are otherwise impractical to reach using conventional shallow soil stabilization and replacement methods. The predominant binder materials used are Ordinary Portland cement (OPC) and Lime (CaO) but negative effects to the environment from manufacture and increasing construction cost have prompted research into alternative materials. This review identifies pozzolans and filler materials as possible supplements or partial substitutes for better results. The DSM method and binder reaction processes during treated soil strength development are outlined and effectiveness of different pozzolans (Fly Ash, Silica Fume, Ground Granulated Blast Furnace Slag, Rice Husk Ash, Kaolin, and Metakaolin) and filler materials (e.g. fine sand) discussed together with their influence factors. With many pozzolans, a clear optimum dosage is observed where improved strength peaks. Aluminosilicate pozzolans perform better over siliceous pozzolans with Metakaolin (MK) identified as the most effective pozzolan for enhancing compressive strength. Up to date research results on these materials are compiled. MK blended cements are readily available and can be readily applied for initial field tests. Treated soil strength may be regulated with addition of filler materials to further reduce reliance on cement.

show abstract

Section: Cement Bindersmentioning

confidence: 99%

Section: Cement Bindersmentioning

confidence: 99%

Cementitious, Pozzolanic And Filler Materials For DSM Binders

2020

View full text Add to dashboard Cite

show abstract

“…Recent field investigation of the long-term behaviour of soilcement columns showed that, after 20 years' usage, the strength of the soil-cement column material had became twice that of the 100-day strength. 28 The design life of the road is 20 years. Therefore, within the service life, the CA method is considered satisfactory and sustainable.…”

Section: Basic Design Considerationsmentioning

confidence: 99%

Reducing differential settlements of approach embankments

Shen¹,

Zhang²,

Xu³

2007

Proceedings of the Institution of Civil Engineers - Geotechnica

View full text Add to dashboard Cite

This paper presents a case history of an approach road remediation project on a low embankment over soft Ariake clay, located in the coastal Saga Plain of Japan. After the road had been opened to traffic for two-anda-half years, large settlements were observed, and there was significant differential settlement between piled structures and approach road embankments on soft clay. This differential settlement had a significant impact on vehicle ride quality, and necessitated a remediation programme. In the remediation project, a new method called the column approach (CA) method was adopted to support a transitional zone at the interfaces of piled structures and road embankment. With the CA method a transitional zone was designed at these interfaces to be supported by soil-cement columns of varying lengths to smooth out the settlement profile within these zones. Field monitoring was conducted following completion of remediation. The CA method was also compared with two other Japanese code-designated methods: overlaying a new pavement on the existing pavement at a certain time interval, and constructing a concrete cushion slab under the road pavement. Both practical and economic aspects are examined in the case study presented. This study shows that, when the differential settlement is over 0 . 3 m, overlay remediation is not economic, and the approach cushion method does not perform well. The CA method not only reduces the differential settlement effectively, but also reduces the total construction cost, although the initial investment is relatively high. NOTATION a, b, m, and n 1 constants B spacing of columns CA column approach CBR California bearing ratio C c compression index e 0 initial void ratio EPS expanded polystyrene EQ empirical equations ESL equivalent static loading H col length of columns H em height of embankment i approach slope L a extension of approach L s slab length N number of repeated load P 0 effective overburden pressure q d traffic-load-induced dynamic deviator stress q f static failure deviator stress of soil q s initial static deviator stress S da allowable differential settlement S R differential settlement S s consolidation settlement due to static load S T consolidation settlement due to ESL t s thickness VD vertical drains Z T influential depth H thickness of soft clay under columñ P E static load of embankment P T traffic loading å p cumulative plastic strain (%) Ł inclining angle of pavement INTRODUCTIONFor a road on a low embankment over soft subsoil, permanent deformation of the subsoil due to traffic load is one of the most important factors that controls both the design life and the serviceability and maintenance cost of the road. Deformation induced by traffic load causes large differential settlement between the approach embankments (transitional zone) on soft ground and piled structures such as bridge abutments and box culverts. This differential settlement affects the comfort of the vehicle ride, and can even obstruct vehicle movement. In conventional design considerations two...

show abstract

“…Moreover, previous studies have generally been concerned with the deterioration of cement-treated soils (e.g. Hayashi et al, 2003;Kitazume et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

Ten year follow-up study of airfoam-treated lightweight soil

Watabe¹,

Saegusa²,

Shinsha³

et al. 2011

Proceedings of the Institution of Civil Engineers - Ground Impr

View full text Add to dashboard Cite

Airfoam-treated lightweight soil is lightweight and provides for the early age development of shear strength and effective utilisation of dredged soils. This paper summarises a 10 year follow-up study of the lightweight soils that were placed as backfill at the seawall in Kobe Port Island and Tokyo International airport. These two sites are the early case examples of constructions undertaken in 1996 including the recovery project after the Kobe earthquake disaster and the offshore expansion project of the Tokyo International airport. Sampling and laboratory testing were carried out to investigate the physical and mechanical properties in order to compare the initial material condition. The depth profiles of the soil parameters such as bulk density, water content, pH, calcium content, shear strength, needle penetration resistance, compressive yield stress and compression index were examined. Consequently, it was confirmed that the physical and mechanical properties of the airfoam-treated lightweight soil satisfied their required performance criteria, indicating that the lightweight soil had sufficient durability for use as geomaterial for construction in coastal areas.

show abstract

Field Observation of Long-Term Strength of Cement Treated Soil

Cited by 30 publications

References 0 publications

Cementitious, Pozzolanic And Filler Materials For DSM Binders

Cementitious, Pozzolanic And Filler Materials For DSM Binders

Reducing differential settlements of approach embankments

Ten year follow-up study of airfoam-treated lightweight soil

Contact Info

Product

Resources

About