Name: ARNALDO SAQUETTO JUNIOR
Publication date: 30/09/2024
Examining board:
Name |
Role |
|---|---|
| GEORGIA SERAFIM ARAUJO | Examinador Externo |
| PATRICIO JOSE MOREIRA PIRES | Presidente |
| RONALDO PILAR | Examinador Interno |
Summary: Due to the need to analyze the load produced by the expansion in confinement of LD steel slag for its use in engineering, this work aims to measure this load through the development of an experimental apparatus with thermally controlled hydration, at volumetric expansion levels above 3% and below 3%, measured by the Modified PTM – 130 test, according to the DNIT 113/2009 – ME standard, as well as different particle size ranges. The loads detected by the developed test were expressed in terms of stress in kPa, with the highest recorded stress being 329.28 kPa, for a sample with a particle size distribution between 0 mm and 4.75 mm and a volumetric expansion of 4.67%. It was found that applying a pre-load of 5.42 kPa (10 kgf) to the sample, before conducting the test, can increase the final stress by 75% compared to samples without the application of this pre-load. The lowest confinement expansion stress level was 10.21 kPa, measured in a sample with volumetric expansion below 3%, already pre-cured and without pre-load applied at the start of the test. It was possible to correlate the results obtained with values of void ratio and the free lime content in the sample. The correlation between void ratio and volumetric expansion, and the measured expansion load was very strong and inversely proportional, where lower void ratios resulted in higher measured values. It was verified that the developed equipment is indeed capable of performing this measurement, and it was concluded that the expansion load is closely correlated with volumetric expansion parameters, and that voids influence this expansion load in a confinement situation.
