Autogenous shrinkage modelling of cement paste with fly ash | |
| Author | Arpamart Chanmeka |
| Call Number | AIT Thesis no. ST-99-27 |
| Subject(s) | Fly ash Concrete--Expansion and contraction Fly ash Concrete--Expansion and contraction |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | The study is aimed to propose the model for predicting the autogenous shrinkage of cement paste with and without fly ash. The proposed model based on semi-microstructural consideration. It also includes the effect of cement type, water to binder ratio, replacement percentage and chemical composition of fly ash. The model originates from some hypotheses that are concerned to the standing point that autogenous shrinkage is considered by two mechanisms: progress of hydration of cement and change of the pore structure of the hardened cement paste. The degree of hydration in cement paste is derived from the multi-component hydration heat model (COMH3) which was developed by Kishi and Maekawa (1996). The proposed model is verified by comparing the autogenous shrinkage of cement paste obtained from experiments with those predicted values. Results of nine experimental cases with different types of cement and cement replaced by different types of fly ash in different percentages are used for the verification. It was found in the experiment that autogenous shrinkage of cement paste type III (Japanese cement) is larger than type I (Japanese cement) and type V (Japanese cement), respectively. Autogenous shrinkage increases with increase C3A and C3S content of cement. For the effect of water to binder ratio, a large amount of autogenous shrinkage was observed in cement paste with low water to binder ratio. For the effect of chemical composition, cement paste with fly ash having higher CaO and S03 content resulted in lower autogenous shrinkage. For the effect of fly ash content, increases fly ash content in the mixture results in smaller autogenous shrinkage. The test data from the research of Tazawa E. (1996) and Sudsangiam (1993) are also used for the verification of the model. All the cases show good agreement of the test results with the predicted values. |
| Year | 1999 |
| 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;Pichai Nimityongskul; |
| Examination Committee(s) | Somnuk Tangtermsirikul;Kishi, Toshiharu;Nii, Kazuyochi; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |