Use of lime and rice husk ash as binder for lateritic pavement in rural roads | |
| Author | Choun Vichet Seyla |
| Call Number | AIT Thesis no.ST-03-19 |
| Subject(s) | Roads--Design and construction Pavements Lime |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | The use of rice husk ash combined with lime in road construction can be very economical and at the same time solve the disposal problem. It is hoped that this new binder would substitute cement and be adopted as construction material in the rural areas where cement is not available or more expensive. Rice husk ash can be produced locally through appropriate technology, in countries such as Cambodia with the majority of the population living in rural areas and most of them are farmers, appropriate technology is expected to play an important role in poverty alleviation and the overall development of the country itself. The purpose of this study is to investigate the feasibility study of using lime and rice husk ash as binder for lateritic pavement in rural roads. The main parameter used is the ratio of binder to laterite and it ranges from 1:15 to 1:9. Ordinary laterite pavement is also investigated for comparison. The physical and mechanical properties of binder-laterite investigated in this experiment are moisture content-density relationship, unconfined compressive strength, California Bearing Ratio (CBR), wetting and drying tests for durability. The results showed that the compressive strength of lime-RHA with lateritic pavement varied with change in moisture content and degree compaction. Based on the Transportation Road Research Laboratory (TRRL), the proportion of binder to laterite should be between 1: 12 to 1 :9. The minimum compressive strength of lime-laterite having ratio of 1: 10 is found to be 1.86MPa, which is higher than 1. 7MPa specified by the TRRL. The suggested ratio of lime to RHA is 1:2.The California Bearing Ratio and strength of the binder-stabilized laterite soils using lime-RHA as binder increased with increasing binder content. It is found the CBR value at 95% of dry density for soaked samples are greater than 80% for binder-laterite having binder content more than 7.7% by weight of the total mass. If lime-RHA is used as binder in laterite there is significant improvement in the durability for both soaked and unsoaked samples as compared to lateritic pavements. If 10% of lime-RHA binder is used in lateritic roads, the cost can be reduced by approximately 36% compared to cement stabilized roads having 5% cement content. |
| Year | 2003 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pichai Nimityongskul |
| Examination Committee(s) | Barry, William J.;Kim, Kidu |
| Scholarship Donor(s) | Asian Institute of Technology-Partial Scholarship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2003 |