proper use of lignite fly ash in roller compacted concrete for road pavement | |
| Author | proper use of lignite fly ash in roller compacted concrete for road pavement |
| Call Number | AIT Thesis no.ST-94-18 |
| Subject(s) | Roller compacted concrete Pavements Fly ash--Congresses Fly ash |
| Note | A thesis submitted in partial fulfillment of the requirements for the Degree of Master of Engineering, School of Civil Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | This study describes an experimental investigation into the characteristics of Roller Compacted Concrete Pavement (RCCP), incorporating locally available lignite ash as a partial replacement to cement. The physical properties and mineralogical composition of two types of ashes were dete1mined to find their effect on properties of RCCP+fly ash. The properties of RCCP+fly ash consisted of compressive strength, flexural strength and also relationship between some parameters such as, Marshal compaction value, maximum dry density, vibrating consistency time, optimum moisture content and fly ash content. Cement content was replaced by different type fly ash at different amount. The optimum mix proportion was determined by using compaction method and fabricated by using vibrating table. The test on compressive strength was scheduled up to the age of 3, 7 and 28 days. By the requirements were : compressive strength of 250 kgf/cm2 at 3 days and flexural strength of 50 kgf/cm2 at 28 days. In order to satisfy the strength requirement, two different types of admixture, Pozzolith N-200 and Flo-tight 550SP, were used to improve the properties of RCCP+fly ash and also study their effects on properties of RCCP+fly ash. Both types of admixture are manufactured and supplied by Thai Master Builder co., ltd. The consistency was kept constant for all the mixtures. Results were compared and evaluated for optimum replacement ratio. For the case of cement content 260 kg/m3 , the optimum replacement ratio of fly ash was found to be 35 % (fly ash I cement + fly ash). Flo-tight 550SP was more effective in development of strength at early ages than Pozzolith N-200. Increment in CaO content and finess in fly ash seemed advantageous in getting higher strength both in early and long-term ages. It was concluded that selection and combination of lignite ash and water reducing admixture are crucial in achieving the workability and strength requirements prescribed. |
| Year | 1994 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Aoyagi, Yukio |
| Examination Committee(s) | Pisidhi Karasudhi ; Pichai Nimityongskul ;Nattawuth Udayasen |
| Scholarship Donor(s) | Airport Authority of Thailand |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1994 |