The mechanical properties of water-permeable concrete after mixing with coated recycled aggregates, silica fume, and PVA fiber were investigated in this study. Recycled aggregate was coated double-layer and then mixed as the coarse aggregate of water-permeable concrete. As a result, the void ratio, water-permeability coefficient and strength decreased, as compared to concrete with mixed crushed aggregates. When both silica fume and PVA fiber was added, the strength of the water-permeable concrete increased (compressive strength : by 4.3%, flexural strength : by 2.1 times). Also, the freeze and thaw resistance of the water-permeable concrete increased by approximately 44.15% compared to the plain concrete with no added reinforcing element.

The supposition that curing at cold weather conditions leads to the loss of compressive strength of the high performance concrete was investigated. This paper addresses the results of an extensive experimental study on the compressive strength under cold weather conditions. The specimen was prepared as it’s inside 100-mm diameter and 200-mm heights cylindrical were used. In this work, high performance concrete was designed a water-binder ratio of 0.40. These tests were carried out to investigate the mechanical properties of HPC for 7 and 28 days. The results properties of HPC with silica fume were effective for compressive strength improvement between 7 to 28 curing days at 5°C, -5°C and-15°C.

Hybrid coupled shear wall system with steel coupling beams has known as the effective lateral load resisting system for tall buildings subjected to earthquake. This paper addresses the influence on horizontal ties of steel coupling beams in pseudo strain hardening cementitious composite (PSH2C) hybrid coupled shear wall. Test variables included the connection detail and types of material, concrete and PSH2C, in the connection region. The results show that Specimen PSH2C-SB and PSH2C-SBVRT exhibits a better stable behavior than Specimens HCWS-SB and HCWS-SBVRT.