การปรับปรุงคุณสมบัติของดินลูกรังด้วยน้ำยางพาราธรรมชาติ

Abstract

This research illustrates the engineering property of lateritic soil which has been improved by natural rubber latex. The objectives of this research are to study the property of lateritic soil mixed with Natural Rubber Latex, to find out the appropriate ratio and procedure that match construction work and to study the worthiness for practical usage. The Natural Rubber Latex which has been chosen for this study consisted of solid content for 60 percent and 40 percent of liquid and other content. Firstly, the lateritic soil was tested the index to identify the classification of the sample which was found to be the Sandy silt soil Classification (SM). Then the CBR test and Unconfined Compression Strength test were done to compare strength of the soil as the ratio of the latex is change. In this study, the test is divided into two sets. The former is to test at the incubation of zero-day duration and the latter is seven-day duration. The study was test at the ratio of the latex of 5, 10, 15 and 20 percent of the sample's weight and the latex consisted of dry solid content for approximately 150, 300, 450 and 600 grams respectively per the five- kilogram sample. Study showed that CBR value was at the highest when mixing the latex at the ratio of 10 percent with the highest CBR value of 57.7 as soaked. For this test, incubating the sample before the test would cause the CBR value to be less than without incubating because the air gap occurring during the incubation causing the sample to shrink more when soaked. The highest CBR value of unsoaked was at 86.4 at the seven-day incubation. After the compression test was done, it was found that the compression strength was increase as the latex increased with the highest value of 365.84/cm2 at the latex ratio of 20 percent for the seven-day incubation. The worthiness of latex usage for the construction work, at the moment of usage, the cost of latex should not further than 50 Baht at ten-percent ratio of usage.