Unconfined compression strength and mesostructure of reinforced soil with wheat straw

2021 ◽  
Author(s):  
Jianbin Hao ◽  
Jiaxin Huang ◽  
Jie Yao ◽  
Zhenbei Zhang ◽  
Huan Zhang
Keyword(s):  
Wheat Straw ◽  
Compression Strength ◽  
Reinforced Soil ◽  
Unconfined Compression Strength ◽  
Unconfined Compression

scholarly journals Prediction of Unconfined Compression Strength for Saline-Alkaline Soils Mixed with Cement and Wheat Straw

2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Guoqi Xing ◽  
Changjiang Liu ◽  
Wei Xuan ◽  
Yueyue Pan ◽  
Bing Zhang ◽  
...  
Keyword(s):  
Wheat Straw ◽  
Compression Strength ◽  
Cement Content ◽  
Test Results ◽  
Alkaline Soils ◽  
Unconfined Compression Strength ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Brittle Behavior ◽  
Saline Alkaline Soils

A series of unconfined compression tests were performed to investigate the influence of wheat straws on the unconfined compression strength for saline-alkaline soils and saline-alkaline soils mixed with cement. In unconfined compression tests, 20 groups of soil specimens were prepared at five different percentages of wheat straws content (i.e., 0.0%, 0.1%, 0.15%, 0.2%, and 0.25% by weight of saline-alkaline soils) and four different percentages of cement content (i.e., 0%, 3%, 6%, and 9% by weight of saline-alkaline soils), and unconfined compression tests were carried out after 3-, 7-, 14-, 28-, and 56-day curing periods. Test results indicated that the inclusion of wheat straws within saline-alkaline soils and saline-alkaline soils mixed with cement leads to an increase in the unconfined compressive strength of specimens and also changed the brittle behavior to a more ductile one for specimens. In addition, based on the results from unconfined compression tests, a formula for predicting the unconfined compression strength of specimens related to cement content, wheat straw content, curing periods, etc., was determined, and comparing with the results from unconfined compression tests, it had higher precision in predicting the unconfined compression strength of specimens.

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.

Experimental Study on Mechanical Behaviors of Lime-Stabilized Soils with Small Lime Content

2011 ◽  
Vol 374-377 ◽  
pp. 1823-1826
Author(s):  
Zhong Yu Liu ◽  
Yong Gang Xue ◽  
Xi Jun Wang
Keyword(s):  
Compression Strength ◽  
Compression Modulus ◽  
Curing Time ◽  
Test Results ◽  
Unconfined Compression Strength ◽  
Unconfined Compression ◽  
Mechanical Behaviors ◽  
Lime Content ◽  
Modulus Of Resilience ◽  
Resilience Modulus

In order to investigate the mechanical behaviors of lime-stabilized soils with small lime content, the specimens with 4%~8% lime content and 90%~95% degree of compaction are prepared, and then in use for the unconfined compression strength test, the diametral compression test and the compression resilience modulus test after they have cured in a standard curing room for 7 to 180 days respectively. These test results show that all of the unconfined compression strength, the splitting strength and the compression modulus of resilience increase with the degree of compaction and the curing time. Thereinto, the compression modulus of resilience does rapidly between 28 and 90 curing days, and the unconfined compression strength of the soil with 4% lime content does little after 28 curing days while the compression strengths and the splitting strengths of the other soils do quickly until 90 curing days. In addition, for a given degree of compaction, these strengths of the soils with the less lime content are potentially greater at the early curing time.

Unconfined Compression Strength of Tianluoshan Relic Soils Solidified by Silicone

2012 ◽  
Vol 610-613 ◽  
pp. 2908-2911 ◽  
Author(s):  
Xin Jun Chai ◽  
Chun Feng He ◽  
Yan Sheng Gao
Keyword(s):  
Compressive Strength ◽  
Compression Strength ◽  
Potential Application ◽  
Influence Factors ◽  
Curing Time ◽  
Unconfined Compression Strength ◽  
Compression Tests ◽  
Unconfined Compression ◽  
Moisture Condition ◽  
Curing Condition

Tianluoshan relic sites is a typical earthen sites located at moisture circumstances. The potential application of silicone for strengthening Tianluoshan relic soils were evaluated by a series of unconfined compression tests. The main considered influence factors includue: curing condition, curing time, and variation of water content. The results show that the compressive strength of Tianluoshan relic soils solidified by silicon increase with curing time, and silicon can effectively improve the strength of Tianluoshan relic soils under constant temperature & moisture condition.

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