Use of hydraulic cement for soil improvement in highway construction | |
| Author | Ratanachai Meeampol |
| Call Number | AIT Thesis no.GE-21-11 |
| Subject(s) | Portland cement--Design and construction Soil-cement construction Roads--Design and construction |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Geotechnical and Earth Resources Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Lateritic soil or soil used in soil cement is from the Sia Ku company. The source is initially located at Na Pra-Lan subdistrict Chalermprakiat district Saraburi Province. It is considered poorly graded gravel with clay (GP-GC) by the Unified Soil Classification System, A-2-4 by the American Association of State Highway Officials and Grade C by the Department of Highways Grade. The optimum moisture content of the soil sample equals 9.5%, and dry density equals 2.069 g/cm3. Several cement mixtures are identified again for optimum moisture content and dry density. It is found that the optimum moisture content and dry density of each mix are in the range of 7% - 10% and 2.000 g/cm3 - 2.250 g/cm3, respectively. Within each optimum and dry density, the soil of each mix is compact to find the UCS that passes the Department of Highways code (DHS-204/2556) of 17.5 ksc at 7 days. After getting the passing cement content, an additional cement is concerned by 115%, while the code recommends extending between 100% and 125%. As a result, the additional cement content of hydraulic cement is 3.8% and after addition is 4.6%. This cement content of 4.6% is considered in the testing for different parameters. The results reveal that adding 1% of hydraulic cement can increase the strength of soil cement by almost 3.3 ksc. For the strength performance, UCS at 7 days, UCS of hydraulic cement is 81.55% of the UCS of the Portland cement. In large scale test block testing, to generate a field testing of UCS in the large scale block testing at 7 days, UCS of hydraulic cement is about 94% of the UCS of the laboratory testing. For permeability, hydraulic cement shows a ten times higher permeability than Portland cement. For cement hydration, it is shown that the soil from hydraulic cement reduces its weight at a lower rate than Portland cement. For shrinkage crack, it is found that no significant cracking shows in the specimen. However, hydraulic cement contains lower clinker in terms of ingredients, which causes a lower potential rate to crack than Portland cement. For time delay compaction, hydraulic cement tends to remain the strength longer than the Portland cement. However, both types of cement do not pass the requirement strength 2 hours after mixing. To consider according to the code required, hydraulic cement tends to generate more CO2 by 15.86%. However, if the hydraulic cement is preserved without following the code and extending the curing time, this cement tends to generate less CO2 by 4.28%. |
| Year | 2022 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Geotechnical Engineering (GE) |
| Chairperson(s) | Chao, Kuo Chieh |
| Examination Committee(s) | Avirut Puttiwongrak;Poranic Jitareekul |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2022 |