| Author | Chittakorn Chamnongnit |
| Call Number | AIT Thesis no. ST-97-12 |
| Subject(s) | Mortar--Testing
|
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-97-12 |
| Abstract | This study is aimed at reducing the cost of packaged dry mortar by using different types of locally available pozzolanas as partial cement replacement in the dry mortars. Pozzolanas used in this investigation are rice husk ash (RHA), fly ash (FA) and peanut shell ash (PSA). The percentages of pozzolana replacement are 30 and 50%. The sand used has two different fineness moduli and is referred to as fine and coarse sand. For 30% replacement of pozzolanas, the cementitious material per sand ratio is 1:2.75 by weight and for 50% replacement, the ratio used are 1:2.75 and 1:3.50. Pozzolanas are investigated for their chemical and physical properties before blending with cement and mixing with sand and water to make mortar. The physical and mechanical properties of the proposed dry mortars as well as two commercially available dry mortars which are investigated include the water requirement, setting time, compressive strength. A detailed cost analysis is also conducted. Test results showed that the water requirements of all dry mortars containing partial replacement of rice husk ash and peanut shell ash were higher than those of dry mortars containing ordinary Portland cement and commercially available dry mortars. When fly ash was used as a partial replacement the water requirement was found to be lower due to its lubricant and ball bearing effect. In addition, the setting time of dry mortar containing 30% fly ash replacement was considerably longer than that of dry mortar containing ordinary Portland cement. The setting times of commercially available mortars were found to be much higher than OPC-pozzolana dry mortar which was probably due to the addition of chemical admixture to the commercially available dry mortar. Furthermore, the compressive strengths of dry mortar containing 30% fly ash replacement was found to be higher than those of other types of OPC-pozzolana dry mortars. This was caused by the lower water cementitious material ratio used. The compressive strength of OPC-fly ash dry mortar conformed to the minimum requirement of Type S package dry mortar specified by ASTM standards. However, the performance of all proposed dry mortars with regard to ease in plastering and appearance of the plastered surface was found to be satisfactory. The use of rice husk ash as cement replacement in dry mortar resulted in a slightly darker surface than the case when fly ash was used. |
| Year | 1997 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-97-12 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| 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;Chotchai Charoenngam |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 1997 |