Current Issue : July - September Volume : 2017 Issue Number : 3 Articles : 5 Articles
The reasonable assessment of potential damage type of masonry structures in seismic-prone zone is very significant to strengthen\nexisting masonry structures and guide the construction of the new building. The primary objective of the study is to propose and\ndetermine a reasonable assessment index to predict the damage type of masonry structures in different seismic intensity zones using\nthe survey results of the 2008Wenchuan earthquake and variance analyses comparison methods.Three potential theory assessment\nindexes are considered in the evaluation of damage of masonry structures, including wall density index ...
Structural performance evaluation of composite concrete slabs that were constructed using partially precast concreting system\nwhich utilized Hybrid Fiber-Reinforced Lightweight Aggregate Concrete (HyFRLWAC) as stay in-place formwork and selfcompacting\nconcrete (SCC) as topping layer was conducted in this research. This paper focused on determining the appropriate\nstrength limit criteria of interface between two different concrete layers. The tensile strength was tested using pull-off test, while\nconcrete cohesion was investigated based on modified bisurface shear test, and dual L-shaped shear test was used to determine the\neffect of normal force on the shear strength of concrete interface. Sample variants were designed based on the substrate surface\nconditions, compressive strength of the topping layer, and magnitude of perpendicular normal force acting on interface area.The\nsubstrate surfaces were prepared in as-placed and grooved conditions for tensile test, cohesion, and shear strength test. Test results\nindicate that tensile strength, cohesion, and shear strength of the concrete interface are affected by surface condition of the substrate,\ncompressive strength of the topping layer, and the normal force acting perpendicularly on the concrete interface area. Proposed\nformulation for bond strength prediction between HyFRLWAC as substrate and SCC as topping layer is also presented in this\npaper....
The strengthening of RC structures with fiber reinforced polymer (FRP) materials has demonstrated\nenormous potential as a repairing material. However, their thermal and mechanical behaviors after exposure\nto elevated temperature remain an obstacle due to FRPâ��s sensitivity to high temperatures as compared with order\nstructural materials. In this paper an experimental works was conducted to study the behavior of RC beam with\nNSM CFRP with different adhesive materials exposed to elevated temperature of 550�°C for different periods of time\nand cooling schemes. In this experimental study 6 beams were cast, one beam (BN) was not exposed to elevated\ntemperature as a control beam and the remaining beams were exposed to elevated temperature. These beams\nwere tested under four-point loading. The effect of variables was studied in terms of ultimate failure load,\nmaximum deflection and failure mode. From the test results, it could be concluded that ready-mix mortar could be\nas an alternative adhesive material. The ultimate load-carrying capacity of the RC beam was reduced for longer\nduration of elevated temperature....
The experiment study on the air-entrained concrete of 100mm cubes under triaxial compression with different intermediate\nstress ratio ...
This study aims to show the effect of a modified equivalent mortar volume (EMV) method\non the flexural performance of recycled concrete aggregate (RCA). To verify this, an experimental\nstudy was carried out firstly by testing fresh and hardened material properties of RCA concrete\nspecimens made by two different mixture design methods, i.e., the modified EMV method and\nthe conventional American Concrete Institute (ACI) method. The flexural performance of five\nreinforced recycled concrete (RRC) beams mixed with different mixture designs was then investigated.\nTest results confirmed that the elastic moduli of the RCA concrete specimens made using the modified\nEMV method are greater than those of the conventional ACI mixture, while the drying shrinkage\ntended to decrease. The ultimate strengths of RRC beams mixed with the modified EMV method are\nas much as five percent greater than that achieved with the conventional ACI mixture....
Loading....