Rheological studies of fresh portland cement pastes | |
| Author | Tirona, Ernesto E. |
| Call Number | AIT Thesis no. 80 |
| Subject(s) | Rheology Portland cement |
| Note | A thesis submitted in partial fulfillment if the requirements for the degree of Master of Engineering in the SEATO Graduate School of Engineering, Bangkok, Thailand. |
| Publisher | Asian Institute of Technology |
| Abstract | Rheological measurements of fresh cement pastes were performed with a coaxial cylinder viscometer. Torque vs time breakdown curves were ob¬ tained for various angular speeds and at different water-cement ratios. Hysteresis (rpm vs torque) curves were determined at different times of hydration. Results from experiments on structural breakdown with time show that the torque exerted by the paste initially starts at a large value and then decays and levels off to an almost constant value after 1 to 2 minutes of mechanical shearing. Results obtained, although consistent in themselves, do not fit well with the theories on structural breakdown of pastes advanced by previous investigators. There was no indication that the paste behaved as a Bingham body. Thixotropy was demonstrated at all times of hydration. It is well manifested after 15 minutes and 45 minutes of hydration time. The thixotropic characteristic of the paste appears to have been reduced after 3 hours of hydration. From the experience gained through numerous experiments, recommendations for the efficient use and operation of the viscometer are presented together with proposals for additional features which will be found use¬ ful in future investigations. |
| Year | 1964 |
| Type | Thesis |
| School | Student Research Before 1979 |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Thesis (Year <=1979) |
| Chairperson(s) | Dr. A.R. Cusens; |
| Examination Committee(s) | Dr. Kurt H. Gerstle;Dr. Chai Muktahhant;Dr. John A. Roberson;Dean Milton E. Bender, Jr. |
| Degree | Thesis (M.Eng.) - SEATO Graduate School of Engineering |