@article{Mary Ann Q. Adajar_Wincent Nicole K. Pabilona_2018, title={SOIL-STRUCTURE INTERFACE BEHAVIOR OF CEMENTED- PASTE BACKFILL MATERIAL MIXED WITH MINING WASTE}, volume={14}, url={https://geomatejournal.com/geomate/article/view/1895}, abstractNote={<p>The use of mining wastes as a component of cemented paste backfill provides an<br>environmentally acceptable method of waste disposal at a lesser cost as the method does not require tailing<br>dams for storing the large volume of wastes. This study determines the applicability of cemented-paste<br>backfill materials mixed with aggregate quarry wastes as ground support to concrete structures. Aggregate<br>quarry waste with varying fine contents was used as a substitute for sand in cemented-paste backfill and the<br>mixture was referred to as cemented-paste tailing backfill (CPTB). Its micro fabric structure was determined<br>through SEM-EDX tests. Test results showed that CPTB with 20% and 40% fine contents has acceptable<br>values of strength properties in terms of its unconfined compressive strength and interface friction angle.<br>The unconfined compressive strength in relation to its curing period is in the range of 120 kPa to 150 kPa<br>which can be described as having stiff consistency. The stress-strain interface behavior between CPTB and<br>concrete structure was evaluated through a direct shear test using strain rates that simulate the rapid and slow<br>rates of loading. In both conditions, the stress-strain behavior exhibits strain softening. The average interface<br>friction angle is 38o which can be associated with its dense condition. The modified hyperbolic model was<br>applied to evaluate the soil-structure interface behavior of CPTB. Hyperbolic parameters were formulated to<br>predict the interface shear stress - shear strain behavior of the CPTB when in contact with concretes structure<br>at any value of shear strain and normal effective stress.</p>}, number={44}, journal={GEOMATE Journal}, author={Mary Ann Q. Adajar and Wincent Nicole K. Pabilona}, year={2018}, month={Apr.}, pages={102–108} }