Structural performance of lightly trafficked flexible pavements using different types of interlocking paving blocks | |
| Author | Nakharin Phinyocheep |
| Call Number | AIT Thesis no. ST-88-18 |
| Subject(s) | Pavements, Flexible Pavements, Concrete |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | A simple a nd economical machine capable of producing interlocking concrete paving block is developed in this study. The mechanical properties of the paving block s made from this machine are experimentally investigated. The study attempts to reduce the cost of manufacturing the blocks so that the villagers can produce them in the village . An experimental program is conducted to determine the optimal mix proportion of cement, sand, and powdered rock. Four different types of paving blocks were made and tested for their mechanical properties and t h e results were compared with those available in the markets. Th e mechanical properties which are investigated include compressive strength, flexural Rice husk ash (RHA) strength, absorption and specific gravity. is used up t o 50% by weight substitute some part of cement and adopted as a raw The main parameter considered material for in this study making blocks . was the mix proportion by weight of cement and aggregate at the appropriate water-cement ratio. The percentage of RHA replacement is kept constant through out the experiment. The use of an additive called Z-10/A in the mix is also investigated. The dosage of Z1 0/A additive ranges from 0-3% . Test results indicated that the optimum mi x proportion of materials to be used with this machine was found to be 1.0 : 1.8 : 4.2 by weight for cement : sand : powdered rock in terms of compressive strength . The water cement ratios of the mix were 0 .61 and 0 .86 by weight of cement for ordinary Portland cement blocks and blocks containing 50% RHA, respectively. The paving blocks produced by this machine h ad lower compressive strengths and flexural strengths than those of commercialized blocks . The absorption was greater than the allowable limit given by code and the specific gravity was less than the commercialized ones. Comparing with the commercialized paving blocks, the cost of blocks produced by the machine developed in this study was lowered by about 55%. The initial cost of paving blocks could b e further reduced by 13% when RHA was used as a substitute for cement up to 50% by weight. However their compressive strengths remained more or less the same. The use of additive called Z-10/A at a dosage of 3% by we ight of cementitious material was found to improve the 28-day compressive strength by about 30%. It also improved the appearance of the paving blocks. |
| Year | 1988 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pichai Nimityongskul |
| Examination Committee(s) | Chauhan, Roshan Lal ;Jearkjirm, Vithool |
| Scholarship Donor(s) | The Royal Thai Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |