Grinding methods and its effect on reactivity of rice husk ash | |
| Author | Islam, Md. Sirajul |
| Call Number | AIT Thesis no.ST-81-07 |
| Subject(s) | Rice hulls Grinding machines Building materials--Research |
| 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 |
| Abstract | This study was mainly conducted to develop a low-cost and efficient grinding machine for rice husk ash using readily available materials. Based on the grinding concept of a conventional ball mill, a grinding machine was designed and an experimental program was carried out to investigate the efficiency of the grinding machine. Two types of grinding media were used namely, 30" long mild steel rods and 1/2 in. dia. x 1/2 in. long bright steel pieces. The fineness of the ash is expressed in terms of percent passing through sieve No. 325. The relationship between the fineness of RHA and the compressive strength of RHA-Portland cement mortars was also determined. Test results revealed that the grinding machine is very efficient for the two types of grinding media investigated and can be suitably adopted by people living in rural areas. The compressive strength development of RHA-Portland cement mortars made from 70% replacement of Portland cement by rice husk ash is comparable to that of Portland cement mortars. The optimum volume fractions of grinding media using 30" long mild steel rods and 1/2 in. dia. x 1/2 in. long bright steel pieces are found to be 5.07% and 10% respectively. To produce reactive ash for practical purposes, the minimum grinding times are about 30 and 15 minutes 1 when mild steel rods and bright steel pieces respectively were used as grinding media. From the viewpoint of economy and energy consumption, grinding of RHA by using mild steel rods is preferable. |
| Year | 1981 |
| 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) | Wireland, Martin ; Worsak Kanok-Nukulchai |
| Scholarship Donor(s) | Switzerland Government |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1981 |