Effect of cementation on the compressibility of Singapore upper marine clay

2008 ◽  
Vol 45 (7) ◽  
pp. 1018-1024 ◽  
Author(s):  
Han-Eng Low ◽  
Kok-Kwang Phoon
Keyword(s):  
Ethylene Diamine Tetraacetic Acid ◽  
Amorphous Materials ◽  
Soil Samples ◽  
Ethylene Diamine ◽  
Clay Layer ◽  
Tetraacetic Acid ◽  
Marine Clay ◽  
High Quality ◽  
One Dimensional ◽  
Soil Microstructure

A series of one-dimensional consolidation tests were performed under varying pretreatments on high quality soil samples collected from a Singapore upper marine clay layer in an attempt to evaluate the effect of cementation by amorphous materials on its compressibility. The findings from this study seem to suggest that cementation by ethylene-diamine tetraacetic acid (EDTA) removable amorphous materials may only partially contribute to the development of soil microstructure and overconsolidation in Singapore upper marine clay.

Effect of soil microstructure on the compressibility of natural Singapore marine clay

2008 ◽  
Vol 45 (2) ◽  
pp. 161-176 ◽  
Author(s):  
Han-Eng Low ◽  
Kok-Kwang Phoon ◽  
Thiam-Soon Tan ◽  
Serge Leroueil
Keyword(s):  
Yield Stress ◽  
Void Ratio ◽  
Empirical Method ◽  
Marine Clay ◽  
High Quality ◽  
Compression Curve ◽  
One Dimensional ◽  
Soil Microstructure ◽  
Ratio Difference ◽  
Constant Rate

The effect of soil microstructure on the compressibility of natural Singapore marine clay is studied in this paper. It was found that natural Singapore marine clay can sustain higher void ratio than reconstituted Singapore marine clay at the same effective stress in one-dimensional compression. This difference is most noticeable between yield stress and two times the yield stress. This void ratio difference is commonly attributed to soil microstructure, and the decrease in this difference at higher stresses is attributed to progressive destructuration. As a consequence of progressive destructuration, the virgin compression curve is nonlinear and the compression index along the virgin compression range is variable, which is only noticeable during the constant rate of strain consolidation test on high-quality samples. In the absence of high-quality samples and constant rate of strain consolidation tests, an empirical method is proposed to obtain a first-order estimation of a nonlinear virgin compression curve using index properties and yield stress. This paper demonstrates that the proposed method works reasonably well with natural Singapore marine clay. The error bound for the predicted compression indices is approximately ±20% of the compression indices measured with constant rate of strain test on high-quality samples.

scholarly journals Pemberian Pakan Hijauan Lokal yang Disuplementasi Indigofera dan Probiotik terhadap Total Leukosit dan Diferensial Leukosit Kambing Boerka

2021 ◽  
Vol 10 (3) ◽  
pp. 365-374
Author(s):  
Dheadora Florensia ◽  
I Wayan Batan ◽  
Tjokorda Sari Nindhia
Keyword(s):  
Ethylene Diamine Tetraacetic Acid ◽  
Ethylene Diamine ◽  
Tetraacetic Acid ◽  
Hematology Analyzer

Pemberian pakan yang berbeda dapat menyebabkan perbedaan kondisi fisiologis. Apabila tubuh ternak mengalami perubahan fisiologi, maka dapat berpengaruh pada gambaran darah. Pemeriksaan darah lengkap dilakukan untuk mengetahui status kesehatan hewan, terutama pemeriksaan leukosit yang digunakan untuk penunjang diagnosis terhadap suatu penyakit dan mengetahui adanya respons tubuh terhadap suatu penyakit infeksi. Penelitian ini bertujuan untuk mengetahui profil leukosit kambing boerka yang diberi pakan hijauan lokal dan Indigofera serta probiotik Sampel yang digunakan adalah sampel darah dari 24 ekor kambing boerka betina. Perlakuan yang diberikan adalah pemberian pakan hijauan sebagai kontrol (P0), pakan hijauan yang diimbuhi Indigofera (P1) dan pakan hijauan yang diimbuhi Indigofera dan Bio-CAS (P2). Pengambilan darah dilakukan pada vena jugularis setelah diberi perlakuan pakan selama enam bulan. Darah dimasukkan ke dalam tabung yang berisi antikoagulan Ethylene Diamine Tetraacetic Acid (EDTA). Pemeriksaan gambaran total dan diferensial sel darah putih secara otomatis menggunakan Hematology Analyzer. Hasil penelitian menunjukkan pemberian pakan hijauan lokal yang disuplementasi Indigofera dan probiotik tidak berpengaruh nyata terhadap nilai total leukosit dan diferensial leukosit kambing boerka. Berdasarkan hasil penelitian ini dapat disimpulkan bahwa pemberian pakan hijauan lokal yang disuplementasi indigofera dan probiotik aman diberikan pada kambing boerka.

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