Development of sprayed mortar for fabric formwork | |
| Author | Sis Lwin Phone |
| Call Number | AIT Thesis no.ST-22-02 |
| Subject(s) | Sprayed Concrete Association Concrete construction--Formwork |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Abstract | Fabric could be used as a flexible concrete formwork, allowing builders, engineers, and architects to create almost any shape. It is a method creates a high-quality concrete surface that does not require any additional touch-ups or finishing. For this application, woven polyole-fin textiles are preferred. A porous woven fabric permits excess water from the concrete mix to seep through the mold wall, lowering the concrete mix's watercement ratio. Due to the reduction in water-cement ratio, higher compressive strength in fabric formed concrete may be achieved, as also suggested by earlier research. The emphasis of this research is on the development of Controlling the setting of sprayed mortar and investigating the performance of sprayed mortar in terms of fresh and hardened qualities. The fresh properties of the mortar which is required for spraying mortar are slump flow, setting time, rebound rate, and build-up thickness. The hardened properties such as compressive strength, direct tensile strength, drying shrinkage, and flexural strength are investigated. The research focused on the performance of sprayed mortar with the addition of admixtures and the percentage of silica fume and CSA replacement. The results have shown that sprayed mortar with 0.1% Starch ether (polysaccharide compound), 2% Mighty Mx (water reducing agent), 1% hooked steel fiber by volume fraction and 7% CSA is the optimum mix proportion for use. The maximum build-up thickness is 30 mm that can be applied without sagging. The replacement of silica fume and the addition of Sika Rapid® (accelerator) also produced satisfactory performance which included workability, pumpability and spray ability. Single curve structures were built using the mortar which reached the pre-set targets. |
| Year | 2022 |
| 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) | Pennung Warnitchai;Thanakorn Pheeraphan (Co-chairperson) |
| Examination Committee(s) | Punchet Thammarak;Anwar, Naveed |
| Scholarship Donor(s) | Eight-Japan Engineering Consultants Inc. (E-JEC) Scholarship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2022 |