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Compressibility Behavior Of Tropical Peat Reinforced With Cement Column

One of the most serious problems encountered by civil engineers these days are when it comes to construction on peat soil. Peat soil poses a difficult problem, which has the tendency to subside especially when its moisture content is high. The moisture content may come from rain flooding, leaking fr...

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Main Author: Duraisamy, Youventharan
Format: Thesis
Language:English
English
Published: 2008
Online Access:http://psasir.upm.edu.my/id/eprint/5351/1/FK_2008_8.pdf
http://psasir.upm.edu.my/id/eprint/5351/
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spelling my.upm.eprints.53512013-05-27T07:22:12Z http://psasir.upm.edu.my/id/eprint/5351/ Compressibility Behavior Of Tropical Peat Reinforced With Cement Column Duraisamy, Youventharan One of the most serious problems encountered by civil engineers these days are when it comes to construction on peat soil. Peat soil poses a difficult problem, which has the tendency to subside especially when its moisture content is high. The moisture content may come from rain flooding, leaking from water or sewer lines or from reduction in surface evapo-transpiration when an area is covered by building or pavement. Peat soil causes cracking, settlements and break-up of pavements, railways, highways, embankments, roadways, building foundations, reservoir linings, water lines and sewer line. These entire problems can be solved if the engineering properties of the problem soil are improved to make them suitable for construction. The main objective of this research is to evaluate the effect of cement column on compressibility when installed in peat soil. Apart from that the researcher also found it important to examine the peculiar engineering behaviour of tropical peat with respect to their compressibility characteristics due to variation in fiber content and organic content In addition, the researcher is also interested to identify the influences of other factors like diameter, length, curing time, number of cement columns and amount of cement in cement columns in reducing compressibility. Undisturbed sample of peat soils were taken from Banting, which is situated in the West coast of Peninsular Malaysia. A suitable auger was designed and fabricated to collect undisturbed peat sample of 150 mm diameter and 230 mm in length. Specimens with 45 mm diameter (area ratio = 0.09) and 60 mm diameter (area ratio = 0.16) of cement column were cured for 7, 14 and 28 days, after which they were subjected to Rowe Cell consolidation test. Results are also presented from test conducted on groups of cement columns using four (area ratio = 0.04) and nine (area ratio = 0.09) columns of 15 mm diameter each to investigate the influence of number of cement columns on compressibility of peat soil. Based on the results obtained, it shows that the cement columns can successfully reduce the compressibility of tropical peat. Compression index of fibric sample was reduced by 60% using cement column of 45 mm diameter and 80% with cement column of 60 mm diameter. Hence, it suggests that larger diameter cement column (or high area ratio) has a higher reduction effect in the compression index. The trend is similar in hemic and sapric peat. A group of cement columns had a significant impact in reducing the compressibility parameters compared to a single cement column due to higher surface area. Using 100% amount of cement in columns recorded the best performance. Compressibility parameters (compression index and coefficient of secondary compression) were significantly improved (lowered) with cement column. 2008 Thesis NonPeerReviewed application/pdf en http://psasir.upm.edu.my/id/eprint/5351/1/FK_2008_8.pdf Duraisamy, Youventharan (2008) Compressibility Behavior Of Tropical Peat Reinforced With Cement Column. Masters thesis, Universiti Putra Malaysia. English
institution Universiti Putra Malaysia
building UPM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Putra Malaysia
content_source UPM Institutional Repository
url_provider http://psasir.upm.edu.my/
language English
English
description One of the most serious problems encountered by civil engineers these days are when it comes to construction on peat soil. Peat soil poses a difficult problem, which has the tendency to subside especially when its moisture content is high. The moisture content may come from rain flooding, leaking from water or sewer lines or from reduction in surface evapo-transpiration when an area is covered by building or pavement. Peat soil causes cracking, settlements and break-up of pavements, railways, highways, embankments, roadways, building foundations, reservoir linings, water lines and sewer line. These entire problems can be solved if the engineering properties of the problem soil are improved to make them suitable for construction. The main objective of this research is to evaluate the effect of cement column on compressibility when installed in peat soil. Apart from that the researcher also found it important to examine the peculiar engineering behaviour of tropical peat with respect to their compressibility characteristics due to variation in fiber content and organic content In addition, the researcher is also interested to identify the influences of other factors like diameter, length, curing time, number of cement columns and amount of cement in cement columns in reducing compressibility. Undisturbed sample of peat soils were taken from Banting, which is situated in the West coast of Peninsular Malaysia. A suitable auger was designed and fabricated to collect undisturbed peat sample of 150 mm diameter and 230 mm in length. Specimens with 45 mm diameter (area ratio = 0.09) and 60 mm diameter (area ratio = 0.16) of cement column were cured for 7, 14 and 28 days, after which they were subjected to Rowe Cell consolidation test. Results are also presented from test conducted on groups of cement columns using four (area ratio = 0.04) and nine (area ratio = 0.09) columns of 15 mm diameter each to investigate the influence of number of cement columns on compressibility of peat soil. Based on the results obtained, it shows that the cement columns can successfully reduce the compressibility of tropical peat. Compression index of fibric sample was reduced by 60% using cement column of 45 mm diameter and 80% with cement column of 60 mm diameter. Hence, it suggests that larger diameter cement column (or high area ratio) has a higher reduction effect in the compression index. The trend is similar in hemic and sapric peat. A group of cement columns had a significant impact in reducing the compressibility parameters compared to a single cement column due to higher surface area. Using 100% amount of cement in columns recorded the best performance. Compressibility parameters (compression index and coefficient of secondary compression) were significantly improved (lowered) with cement column.
format Thesis
author Duraisamy, Youventharan
spellingShingle Duraisamy, Youventharan
Compressibility Behavior Of Tropical Peat Reinforced With Cement Column
author_facet Duraisamy, Youventharan
author_sort Duraisamy, Youventharan
title Compressibility Behavior Of Tropical Peat Reinforced With Cement Column
title_short Compressibility Behavior Of Tropical Peat Reinforced With Cement Column
title_full Compressibility Behavior Of Tropical Peat Reinforced With Cement Column
title_fullStr Compressibility Behavior Of Tropical Peat Reinforced With Cement Column
title_full_unstemmed Compressibility Behavior Of Tropical Peat Reinforced With Cement Column
title_sort compressibility behavior of tropical peat reinforced with cement column
publishDate 2008
url http://psasir.upm.edu.my/id/eprint/5351/1/FK_2008_8.pdf
http://psasir.upm.edu.my/id/eprint/5351/
_version_ 1643823164831039488
score 13.211869

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