scholarly journals Variation in strength owing to solidification treatment of weathered granite soil

2021 ◽  
Vol 21 (3) ◽  
pp. 163-169
Author(s):  
Sungyeol Lee ◽  
Sunggon Kim ◽  
Wonjin Baek ◽  
Sungjin Kwon ◽  
Changsung Jung ◽  
...  
Keyword(s):  
Compression Strength ◽  
Raw Material ◽  
Unconfined Compression Strength ◽  
Unconfined Compression ◽  
X Ray Diffraction ◽  
Curing Conditions ◽  
Weathered Granite ◽  
Soil Cement ◽  
Weathered Granite Soil ◽  
Granite Soil

Recently, soil-cement is being increasingly used in various applications such as road pavements, slope protection, backfilling of earth walls, and improving soft ground, in order to increase the strength of the raw material soil. Therefore, in this study, the characteristics of changes in the unconfined compression strength of soil-cement were analyzed by adding a solidifying agent targeting granite soil, which is representatively distributed in Korea. Laboratory tests were conducted to analyze the changes in strength according to 1) curing conditions and fine contents, 2) inorganic solidifying agent, and 3) repeated effects of dry and wet conditions. The unconfined compression strength of soil-cement increased as the curing period and mixing ratio increased, and it was constant after 14 days of curing. In addition, weathered granite soil with relatively low fine contents showed a large increase in the unconfined compression strength. In addition, the strength increased with an increase in the solidifying agent added. X-ray-diffraction analysis showed that vermiculite was generated by adding cement and admixtures, and the strength was increased by filling the gap between the particles. Considering the results of this study, a relationship between the unconfined compression strength and the elastic modulus of soil-cement by treatment with a solidifying agent was proposed.

scholarly journals Data mining approach for unconfined compression strength prediction of laboratory soil cement mixtures

Geotecnia ◽  
2019 ◽  
Vol 145 ◽  
pp. 3-16
Author(s):  
Joaquim Tinoco ◽  
◽  
<br>António Alberto Correia ◽  
<br>Paulo Venda Oliveira ◽  
<br>António Gomes Correia ◽  
...  
Keyword(s):  
Data Mining ◽  
Compression Strength ◽  
Strength Prediction ◽  
Unconfined Compression Strength ◽  
Unconfined Compression ◽  
Data Mining Approach ◽  
Soil Cement ◽  
Cement Mixtures

scholarly journals Data mining approach for unconfined compression strength prediction of laboratory soil cement mixtures

Geotecnia ◽  
2019 ◽  
Vol 145 ◽  
pp. 3-16
Author(s):  
Joaquim Tinoco ◽  
◽  
<br>António Alberto Correia ◽  
<br>Paulo Venda Oliveira ◽  
<br>António Gomes Correia ◽  
...  
Keyword(s):  
Data Mining ◽  
Compression Strength ◽  
Strength Prediction ◽  
Unconfined Compression Strength ◽  
Unconfined Compression ◽  
Data Mining Approach ◽  
Soil Cement ◽  
Cement Mixtures

scholarly journals Application Ranges of EPB Shield TBM in Weathered Granite Soil: A Laboratory Scale Study

2021 ◽  
Vol 11 (7) ◽  
pp. 2995
Author(s):  
Tae-Hwan Kim ◽  
In-Mo Lee ◽  
Hee-Young Chung ◽  
Jeong-Jun Park ◽  
Young-Moo Ryu
Keyword(s):  
Water Content ◽  
Upper And Lower Bounds ◽  
Shield Tunnel ◽  
Particle Crushing ◽  
Pressure Balance ◽  
Soil Conditioning ◽  
Weathered Granite ◽  
Weathered Granite Soil ◽  
Granite Soil ◽  
Epb Shield

Soil conditioning is a key factor in increasing tunnel face stability and extraction efficiency of excavated soil when excavating tunnels using an earth pressure balance (EPB) shield tunnel boring machine (TBM). Weathered granite soil, which is abundant in the Korean Peninsula (also in Japan, Hong Kong, and Singapore), has different characteristics than sand and clay; it also has particle-crushing characteristics. Conditioning agents were mixed with weathered granite soils of different individual particle-size gradations, and three characteristics (workability, permeability, and compressibility) were evaluated to find an optimal conditioning method. The lower and upper bounds of the water content that are needed for a well-functioning EPB shield TBM were also proposed. Through a trial-and-error experimental analysis, it was confirmed that soil conditioning using foam only was possible when the water content was controlled within the allowable range, that is, between the upper and lower bounds; when water content exceeded the upper bound, soil conditioning with solidification agents was needed along with foam. By taking advantage of the particle-crushing characteristics of the weathered granite soil, it was feasible to adopt the EPB shield TBM even when the soil was extremely coarse and cohesionless by conditioning with polymer slurries along with foam. Finally, the application ranges of EPB shield TBM in weathered granite soil were proposed; the newly proposed ranges are wider and expanded to coarser zones compared with those proposed so far.

scholarly journals Performance of soils enhanced with eco-friendly biopolymers in unconfined compression strength tests and fatigue loading tests

2021 ◽  
Author(s):  
Jing Ni ◽  
Shan-Shan Li ◽  
Lei Ma ◽  
Xueyu Geng
Keyword(s):  
Moisture Content ◽  
Compression Strength ◽  
Xanthan Gum ◽  
Initial Moisture Content ◽  
Fatigue Loading ◽  
Unconfined Compression Strength ◽  
Unconfined Compression ◽  
Soil Stabilisation ◽  
Loading Tests ◽  
Gum Content

Recently, biopolymers have emerged in soil stabilisation. The efficiency of biopolymers in groundimprovement is mainly dependent on biopolymer types, soil types, biopolymer contents, curing periods,thermal treatment and mixing methods. However, the effect of the initial moisture content during samplepreparation stages, on the mechanical behaviours of biopolymer-treated soils, has not been fullyunderstood. The first part of this study probed the role of initial moisture content, in treating Shanghaiclay with the xanthan gum by performing standard proctor compaction tests, Atterberg limit tests,unconfined compression strength (UCS) tests and microstructural analysis, while the second part contributedto capture the fatigue behaviours of the samples treated with an ideal moisture content by performingconstant-amplitude and stepping-amplitude fatigue loading tests. Our results showed that theimprovement appeared to occur from an average optimum moisture content for the treated soils (treatedoptimum), which was 3% wet of the untreated optimum. As the initial moisture content increased, theUCS values were elevated. However, there existed an ideal initial moisture content leading to the maximumstrengthening efficiency. For xanthan gum content (i.e., the mass of xanthan gum with respect tothe mass of dry soil) ranging from 1.0% to 5.0%, this ideal value was between 1.1 and 1.2 times the treatedoptimum. Our results also indicated that xanthan gum, as a biopolymer soil strengthener, was efficient inincreasing either fatigue life or bearing capacity, under repeated loading for xanthan gum-soil matrices,when compared to untreated soils. While the untreated soils failed at the stress level of only half the UCS,the xanthan gum-treated soils with a 3.0% xanthan gum content sustained at the end of the tests. Thesedata imply the potential use of xanthan gum in soil stabilisation, under repeated loads.

scholarly journals The Effect of Polymer-Cement Stabilization on the Unconfined Compressive Strength of Liquefiable Soils

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Ali Ateş
Keyword(s):  
Compressive Strength ◽  
Compression Strength ◽  
Unconfined Compressive Strength ◽  
Soil Stabilization ◽  
Sandy Soils ◽  
Pulse Velocity ◽  
Unit Weight ◽  
Unconfined Compression Strength ◽  
Compression Tests ◽  
Unconfined Compression

Soil stabilization has been widely used as an alternative to substitute the lack of suitable material on site. The use of nontraditional chemical stabilizers in soil improvement is growing daily. In this study a laboratory experiment was conducted to evaluate the effects of waterborne polymer on unconfined compression strength and to study the effect of cement grout on pre-venting of liquefiable sandy soils. The laboratory tests were performed including grain size of sandy soil, unit weight, ultrasonic pulse velocity, and unconfined compressive strength test. The sand and various amounts of polymer (1%, 2%, 3%, and 4%) and cement (10%, 20%, 30%, and 40%) were mixed with all of them into dough using mechanical kneader in laboratory conditions. Grouting experiment is performed with a cylindrical mould of  mm. The samples were subjected to unconfined compression tests to determine their strength after 7 and 14 days of curing. The results of the tests indicated that the waterborne polymer significantly improved the unconfined compression strength of sandy soils which have susceptibility of liquefaction.

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