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S Karki
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Determination of Optimum Strength of Red Soil and Mixed Soil using Soil-Cement (S/C) Mix Ratio S Karki; S. Manandhar Manandhar; P. Voottipruex
Lowland Technology International Vol 22 No 1 (2020): Lowland Technology International Journal - Special Issue on: Engineering Geology
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The research paper is focused on the improvement of the palaeolateritic red soil, clayey silt of low plasticity (ML) from Ratmatearea incorporating mixed with poorly graded sand with gravels(SP) from Helipad area inside the premises of Devghathydropower station, Nuwakot District, Nepal. With theconfirmation of maximum dry density (MDD) and optimummoisture content (OMC), 20% of SP was mixed homogenouslywith 80% of ML and experimented by adding cements at 3%,5%, 7% and 10% respectively. Hence ML and mixed soil(H20:R80) have been cured for 7, 14 and 28 days for thedetermination of undrained strength by UCS and pulse velocityby passing Pundit ultrasonic pulse velocity to check thecompactness of specimens. The Pearson’s coefficient ofcorrelation between UCS test and UPV revealed the strongpositive correlation linear relationship of 0.78. The linearregression model elucidates that for every additional undrainedstrength determined by UCS, the pulse velocity is expected to beenlarged by an average of 0.5135 m/s. Since, the cementadmixture of more than 7% impedes the rapid increase in pulsevelocity which was also confirmed by UCS tests due to thepresence of high capillary porosity of cement when excesscement was added. The study predicts that the optimum cementcontent for both soils in this research are best suitable at 7%admixture of cement when cured for 28 days.
Characteristics of Cement Treated Soil: A Case Study from Soft Bangkok Clay and Red Soil of Nepal Salisa Chaiyaput; S Manandhar; S Karki; J Ayawanna
Lowland Technology International Vol 22 No 2 (2020): Lowland Technology International Journal
Publisher : International Association of Lowland Technology

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.0001/ialt_lti.v22i2, Septemb.876

Abstract

Soft Bangkok Clay from Thailand and clayey silt of red soil,Nepal have been incorporated for the research as a case studyin order to understand the characteristics. Highly plastic softBangkok Clay and low plastic clayey silt have been confirmedas non-swelling soils through XRD analyses. The peakintensities of red soil from Nepal is more than two times higherthan the intensity of soft Bangkok Clay. Higher water contentand warm temperature form lower intensities in the soft BangkokClay resembling the amorphous state with compared to red soilof Nepal. As a result, the amount of admixture of cement in clayvaries significantly to enhance the adequate strength. Hence,the research has delineated through determining undrainedstrengths treated with cement in different proportions at differentcuring time and checked the stiffness by passing throughultrasonic wave velocity. The specimens were extracted fromthe depths of 3.0 m and 12.0 m soil-cement column formed bydry method in Thailand and in-situ clayey silt from Nepal wastreated with cement. Besides, 20% local poorly graded soil wasadded in the clayey silt and all treated specimens were cured for7, 14 and 28 days. The results confirmed that the Bangkok Clayreceived the highest strength at 13.89% of cement addition for3.0 m depth core and 11.11% of cement treatment received themaximum strength for 12.0 m core cured for 28 days.Conversely, clayey silt from Nepal received the maximumstrengths at 7% cement treatment cured for 28 days.
Co-Authors J Ayawanna P. Voottipruex S Manandhar S. Manandhar Manandhar Salisa Chaiyaput