Appropriate technology development of aerated lightweight mortars using pulverized fly ash and bottom ash | |
| Author | Gunawan, Andrian |
| Call Number | AIT Thesis no.ST-06-14 |
| Subject(s) | Air-entrained concrete Lightweight construction Appropriate technology |
| 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-06-14 |
| Abstract | The purpose of this research is to develop a new technology for making lightweight mortar without using autoclave apparatus. This study utilizes pulverized fly ash and bottom ash obtained from Mae Moh Lignite Power Plant in Lampang Province, Thailand as the main ingredients. Two types of superplasticizer namely polycarboxylate and naphthalene based superplasticizer are used as additive to make lightweight mortar in this research in order to enhance its mechanical properties. This experimental program was divided into three main parts, the first part dealt with preliminary testing program which was performed to study the effect of aluminum powder, quick lime and superplasticizer and selection of the appropriate type of superplasticizer and fine aggregate. The second part dealt with main testing program which was conducted to determine optimum amount of pulverized fly ash and appropriate mix composition. The last part was development of lightweight mortar having density below 1000 kg/m3. The physical and mechanical properties of lightweight mortar samples to be determined are namely the density, compressive strength and water absorption. Test results indicated that the optimum percentages of aluminum powder, quick lime, superplasticizer and fly ash were 0.1% by weight of binder, 10% by weight of binder, 0.5% by weight of cement and 10% by weight of binder respectively by taking into account the density and compressive strength of lightweight mortar as a whole. It was also found that polycarboxylate based superplasticizer was more effective than naphthalene based superplasticizer. The proportion of binder, bottom ash, aluminum powder, superplasticizer and fly ash of the optimum mix for making the lightweight mortar using pulverized fly ash as pozzalan was found to be 55%, 45%, 0.1% by weight of binder, 0.5% by weight of cement and 10% by weight of binder respectively. This optimum mix possessed compressive strength approximately 40% higher than the control mix and 90% higher than those of other mixes which contained different jercentages of fly ash. Furthermore, lightweight mortar having density below 1000 kg/m had been made in this study by taking into account the specific gravity of the bottom ash and binder. The percentages of binder and bottom ash which were used in this part were 45% and 55% respectively. Fly ash was not used in the mix proportion in order to maintain the compressive strength, although it can decrease the density of lightweight mortar. The proportion of quick lime, aluminum powder and superplasticizer for lightweight mortar having density below 1000 kg/m3 mix were 5% by weight of binder, 0.5% by weight of binder and 0.5% by weight of cement respectively. Finally, by using appropriate technology without autoclave apparatus, it is feasible to develop lightweight mortar by adding superplasticizer in the mix. Moreover, the 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 mortar. The utilization of these waste products will also reduce pollution and disposal problems caused by them |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-06-14 |
| 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) | Kato, Yoshitaka;Ravande Kishore; |
| Scholarship Donor(s) | AIT Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |