SHEAR STRENGTH OF POLYURETHANE-RESIN
STABILIZED VOLCANIC SAND
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Institusion
Universitas Atma Jaya Yogyakarta
Author
PERMANA, YOHANES MEINATA
Subject
Structure
Datestamp
2016-10-26 07:32:36
Abstract :
In construction project, knowing the type and characteristics of the soil is a very important thing. Not all soil have a good performance to support the structure above it. If the construction building is constructed above the weak soil, it is risky and susceptible to collapse because such soil has a differential settlements due to its poor shear strength and high compressibility. Therefore, an effort to change the soil characteristics to increase its engineering performance is highly required. Experiments to improve the strength of volcanic sand by the polyurethane-resin (PU) as additive material conducted in this research. The objectives of this research is to investigate the effects of adding polyurethane-resin for soil shear strength improvement. Specimens were prepared by adding different amount of polyurethane-resin (2%,4%,6%, and 8%) to volcanic sand. The shear strength of specimens determined with direct shear test and compared to each other with the different curing time condition (0 and 7 days) to get the effect of polyurethaneresin on volcanic sand. The results of this research indicated that the addition of polyurethane-resin improve the shear strength of sample. The optimum level of shear strength on sand + 8% PU at 7 days curing time with the average shear stress value is 0.131 kg/cm2 , it is increase 14.91% compared with the original soil shear strength. However, polyurethane-resin enhanced the strength of samples after 7 days of curing time, but the strength of 0 day curing time is less than the original soil without additive material.
In construction project, knowing the type and characteristics of the soil is a very important thing. Not all soil have a good performance to support the structure above it. If the construction building is constructed above the weak soil, it is risky and susceptible to collapse because such soil has a differential settlements due to its poor shear strength and high compressibility. Therefore, an effort to change the soil characteristics to increase its engineering performance is highly required. Experiments to improve the strength of volcanic sand by the polyurethane-resin (PU) as additive material conducted in this research. The objectives of this research is to investigate the effects of adding polyurethane-resin for soil shear strength improvement. Specimens were prepared by adding different amount of polyurethane-resin (2%,4%,6%, and 8%) to volcanic sand. The shear strength of specimens determined with direct shear test and compared to each other with the different curing time condition (0 and 7 days) to get the effect of polyurethaneresin on volcanic sand. The results of this research indicated that the addition of polyurethane-resin improve the shear strength of sample. The optimum level of shear strength on sand + 8% PU at 7 days curing time with the average shear stress value is 0.131 kg/cm2 , it is increase 14.91% compared with the original soil shear strength. However, polyurethane-resin enhanced the strength of samples after 7 days of curing time, but the strength of 0 day curing time is less than the original soil without additive material.
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