Production of aerated and autoclaved lightweight mortar containing pulverized fly ash and bottom ash | |
| Author | Thanmaporn Ungsongkhun |
| Call Number | AIT Thesis no.ST-05-11 |
| Subject(s) | Fly ash Lightweight concrete Air-entrained 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 |
| Series Statement | Thesis ; no. ST-05-11 |
| Abstract | The purpose of this research is to study and develop lightweight mortars using fly ash and bottom ash obtained from Lignite Power Plant in Lampang Province, Thailand as the main ingredients. Dolomite powder and limestone power available in Thailand are also used as fine aggregate to make lightweight mortars. The experimental investigation involved the determination of appropriate manufacturing methods of Autoclaved Aerated Concrete (AAC) and the curing technique based on the compressive strength and densities of lightweight mortars. The optimum amount of aluminum powder and quick lime for making lightweight mortars will also be obtained. Superplastisizer is not used in the mix proportion. The properties of lightweight mortar samples to be determined are namely the density, the compressive strength at various ages and the water absorption. A cost analysis will also be conducted. Test results showed that the optimum temperature and duration of autoclave curing based on compressive strength and density were 160C and 8 hours respectively. It was found that 10% of quick lime and 0.4% of aluminum powder by weight were the optimum values and be used to make lightweight mortars in this study. The use of fly ash content as cement replacement retarded the initial and final setting times of lightweight mortars. It was also resulted in decreased water to cementitious ratio and density of lightweight mortars for the same consistency. With regards to the use of bottom ash, dolomite powder and limestone powder as fine aggregate for making lightweight mortars, it was found that bottom ash can be used as fine aggregate instead of natural river sand and resulted in the highest density and compressive strength whereas lightweight mortar containing dolomite powder and limestone powder as fine aggregate showed lower density and compressive strength. There was a long-term retrogression of strength of lightweight mortar investigated in this study. Most of the mixes showed higher compressive strength at early age and the strength gradually decreased at later age. The cost of lightweight mortar decreased with the increased content of fly ash and the used bottom ash as fine aggregate. Finally, it can be concluded that fly ash and bottom ash from Mae Moh Lignite Power Plant in Lampang Province of Thailand can be satisfactorily used as cement replacement and fine aggregate respectively for making lightweight mortars. In addition, the utilization of these waste products will also reduce pollution and disposal problems caused by them. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-05-11 |
| 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) | Worsak Kanok-Nukulchai;Kidu, Kim; |
| Scholarship Donor(s) | His Majesty the King of Thailand; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |