CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN
Abstract: <br /> <br /> <br /> <br /> <br /> Poor foundation soils (CBR<5%) have been encountered at some locations along the corridor of the proposed Ciawi-Sukabumi Toll Road and various options need to be considered to develop a satisfactory and economic pavem...
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id-itb.:88712017-09-27T15:21:03ZCEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN Wahjuningsih (NIM : 269 94 018), Nurul Indonesia Theses INSTITUT TEKNOLOGI BANDUNG https://digilib.itb.ac.id/gdl/view/8871 Abstract: <br /> <br /> <br /> <br /> <br /> Poor foundation soils (CBR<5%) have been encountered at some locations along the corridor of the proposed Ciawi-Sukabumi Toll Road and various options need to be considered to develop a satisfactory and economic pavement design. Improvement of the foundation soil by cement stabilization is one option that merits consideration. <br /> <br /> <br /> <br /> <br /> The soil sampled at one location along the corridor for this research program was classified as MH (inorganic silt with high plasticity) according to the USCS, and as A-7-5 (clayey soils) according to the AASHTO classification system. Soils thus classified are rated poor as subgrade material and unsatisfactory for embankment construction. At its natural moisture content of about 59%, the soil has a CBR value of 1.2% and UCS value of 0.38 kg/cm2. When compacted at optimum moisture content (30.8%), the CBR value is 7% and the UCS value is 0.65 kg/cm2. <br /> <br /> <br /> <br /> <br /> The addition of cement to the soil increases the UCS value. Cement contents used were 8%, 10% and 12% while curing times considered were 3,7,14 and 28 days. After 28 days curing, the UCS of the soil mixed with 12% cement is 18.49 kg/cm2. <br /> <br /> <br /> <br /> <br /> The Puncak-Cicurug link is analyzed from 5 links available along the proposed Toll Road. The DAMA program was used both for foundation design and pavement design, for natural subgrade CBR values of 2%, 3%, 4% and 5%. A modulus value of soil cement of 0.5 GPa (72,500 psi), as proposed by Croney (1992), was used in the analysis because of the uncertainty of the correlation of strength and modulus of soil cement. A modulus of 0.25 GPa (36,250 psi) was also used for purposes of comparison. <br /> <br /> <br /> <br /> <br /> The analysis was performed for constant thicknesses of surfacing (100 mm) and stabilized subgrade layer (175 mm). A significant reduction of asphalt-treated base thickness is achieved by the introduction of a cement-stabilized layer. The most significant reduction in asphalt-treated base thickness is achieved at the lower values of natural subgrade CBR. Varying the thickness of the unbound granular layer from 300 mm to 600 mm does not significantly affect the thickness of asphalt-treated base. However the thickness of unbound material required over an untreated subgrade will be determined primarily by the subgrade modulus and the effects of construction traffic. text |
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Abstract: <br />
<br />
<br />
<br />
<br />
Poor foundation soils (CBR<5%) have been encountered at some locations along the corridor of the proposed Ciawi-Sukabumi Toll Road and various options need to be considered to develop a satisfactory and economic pavement design. Improvement of the foundation soil by cement stabilization is one option that merits consideration. <br />
<br />
<br />
<br />
<br />
The soil sampled at one location along the corridor for this research program was classified as MH (inorganic silt with high plasticity) according to the USCS, and as A-7-5 (clayey soils) according to the AASHTO classification system. Soils thus classified are rated poor as subgrade material and unsatisfactory for embankment construction. At its natural moisture content of about 59%, the soil has a CBR value of 1.2% and UCS value of 0.38 kg/cm2. When compacted at optimum moisture content (30.8%), the CBR value is 7% and the UCS value is 0.65 kg/cm2. <br />
<br />
<br />
<br />
<br />
The addition of cement to the soil increases the UCS value. Cement contents used were 8%, 10% and 12% while curing times considered were 3,7,14 and 28 days. After 28 days curing, the UCS of the soil mixed with 12% cement is 18.49 kg/cm2. <br />
<br />
<br />
<br />
<br />
The Puncak-Cicurug link is analyzed from 5 links available along the proposed Toll Road. The DAMA program was used both for foundation design and pavement design, for natural subgrade CBR values of 2%, 3%, 4% and 5%. A modulus value of soil cement of 0.5 GPa (72,500 psi), as proposed by Croney (1992), was used in the analysis because of the uncertainty of the correlation of strength and modulus of soil cement. A modulus of 0.25 GPa (36,250 psi) was also used for purposes of comparison. <br />
<br />
<br />
<br />
<br />
The analysis was performed for constant thicknesses of surfacing (100 mm) and stabilized subgrade layer (175 mm). A significant reduction of asphalt-treated base thickness is achieved by the introduction of a cement-stabilized layer. The most significant reduction in asphalt-treated base thickness is achieved at the lower values of natural subgrade CBR. Varying the thickness of the unbound granular layer from 300 mm to 600 mm does not significantly affect the thickness of asphalt-treated base. However the thickness of unbound material required over an untreated subgrade will be determined primarily by the subgrade modulus and the effects of construction traffic. |
format |
Theses |
author |
Wahjuningsih (NIM : 269 94 018), Nurul |
spellingShingle |
Wahjuningsih (NIM : 269 94 018), Nurul CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN |
author_facet |
Wahjuningsih (NIM : 269 94 018), Nurul |
author_sort |
Wahjuningsih (NIM : 269 94 018), Nurul |
title |
CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN |
title_short |
CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN |
title_full |
CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN |
title_fullStr |
CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN |
title_full_unstemmed |
CEMENT STABILIZATION OF SUBGRADE AND ITS EFFECT ON FLEXIBLE PAVEMENT THICKNESS DESIGN |
title_sort |
cement stabilization of subgrade and its effect on flexible pavement thickness design |
url |
https://digilib.itb.ac.id/gdl/view/8871 |
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1820664532491567104 |