Production of low cost self-compacting concrete using fly ash and dolomite powder | |
| Author | Barbhuiya, Salim Ahmed |
| Call Number | AIT Thesis no.ST-05-17 |
| Subject(s) | Fly ash Dolomite Concrete Powders |
| 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 |
| Series Statement | Thesis ; no. ST-05-17 |
| Abstract | Self-compacting concrete (SCC) is considered by many experts to be the greatest breakthrough in the concrete technology due to the improved performance and working environment. Although the use of SCC has many technical, social and overall economical advantages, the higher supply cost of SCC over conventional concrete has limited its applications to general construction. Therefore, for producing low cost SCC, it is essential to find out whether fly ash and dolomite powder can be used in SCC and if so, how the variations of these materials affect the fresh and hardened properties of SCC. Hence, this research work is aimed at the making of SCC more affordable for the construction market using fly ash and dolomite powder and to study the relative costs of the materials used in SCC using fly ash and dolomite powder with that using only superplasticizers. The main variables in this research study are the proportion of fly ash and dolomoite powder and dosage of polycarboxylate-based superplasticizer. The parameters those are kept constant are the total amount of powder content (cement + fly ash + dolomite powder) equal to 580 kg/m3, total amount of cement content 290 kg/m3 and the water/powder ratio equal to 0.38. Test results showed that it is feasible to develop low cost self-compacting concrete using fly ash and dolomite powder which are locally available in Thailand. For making such concrete, the cost could be reduced using high amount of fly ash and dolomite powder instead of using viscosity modifying agent, which is required for stability. In the fresh state, the self-compacting concrete with different proportions of fly ash and dolomite powder (1:0, 3:1, 1:1, 1:3, 0:1) have slump flow in the range of 550 to 650 mm, flow time ranging from 5 to 8 sec and L-box ratio ranging from 0.65 to 0.8. The mix containing fly ash and dolomite powder in the ratio 3:1was found to satisfy the requirements suggested by the EFNARC (European Federation of Producers and Contractors of Specialist Products for Structures) guide for making self-compacting concrete. The compressive strengths developed by the self-compacting concrete with different proportions of fly ash and dolomite powder at 28 days were very much comparable to the control concrete. However, all the self-compacting concrete mixes showed poor early strength, compared to the control concrete. From the cost analysis, it was found that the cost of ingredients of self-compacting concrete (containing fly ash and dolomite powder in the ratio 3:1) is 28.36% less than the control concrete, both having approximate compressive strength of 35 MPa. However, it should be noted that the properties of such low cost self-compacting concrete might not be as good as that of control concrete. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-05-17 |
| Type | Thesis |
| School | School of Engineering and Technology |
| 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) | Pennung Warnitchai;Kim, Kidu; |
| Scholarship Donor(s) | Asian Institute of Technology Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |