This paper performed compressive tests on corroded reinforced concrete (RC) columns with externally confined ultra-high performance (UHPC) jacket. The studied parameters in this testing program was the corrosion ratio of specimens. influences parameter behavior by UHPC jacket reported and discussed. test results revealed that when rust rate less than 20%, axial cracking typical failure mode unr...

Ultra-high-performance concrete (UHPC) is a material that has high compactness, low porosity, and mechanical strength, with especially tensile strength. Due to these characteristics, the behavior of when exposed temperatures debatable. The amount fibers in mixture, which makes UHPC present seen as one arguments for good performance temperatures. objective this study was evaluate behaviors ultra...

The use of ultra-high performance concretes (UHPC) in the modern construction industry is increasingly widespread. UHPCs are a type concrete that provides advantages solving many engineering problems. have superior properties compared to conventional terms workability, self-settling, as well high strength and durability. However, although advantages, achieving desired workability one biggest ch...

The flexural strength of ultra-high performance concrete with basalt aggregates (UHPC-CA) strongly depends on the micromechanical property CA, interfacial transition zone (ITZ) and matrix. However, influence rate-dependent UHPC-CA has not been well understood. Here, different initial distributions are produced by controlling hydration development, its influences investigated a multi-scale analy...

Here, the intrinsic driving mechanisms of autogenous shrinkage for Ultra-High Performance Concrete (UHPC) incorporating porous internal curing (IC) medium are detailly investigated, including characterization and monitoring UHPC hydration kinetics, relative humidity (IRH) temperature (IT) fields. The results show that evolution prepared with pre-wet fine aggregate (PFA) undergoes multiple stage...

Concrete structures exposed to harsh environments, especially including bridges, harbor are often suffered from durability problems. Typical external signs include surface deterioration, cracking caused by for example sulphate attack, frost action or reinforcement corrosion. All strongly linked the porous microstructure of binder matrix and chemical decomposition certain phases. Full replacemen...

The Modified Andreasen and Andersen model (MAA model) is commonly chosen to realize condensed particle packing in ultra-high-performance concretes (UHPCs). In the MAA model, q (distribution modulus) a parameter that plays critical role UHPC matrix design. objective of this study figure out influence id...

Recently, Ultra-High Performance Concrete (UHPC) has attracted increasing attention in civil engineering. Numerous steel–UHPC composite structures have been constructed around the world. The proper consideration of shear-lag effect a significant influence on safety structures. In view ribbed slab structure (SU-RSCS) elastic stage, theoretical calculation model based bar simulation method is fir...

Supplementary cementitious materials (SCMs) have been widely used to replace cement in UHPC, which benefits reducing CO2 emissions and declining construction costs. However, the influence of SCMs on dynamic compressive properties Ultra-high performance concrete (UHPC) paste has not well understood. Here, workability, pore structure, quasi-static strength UHPC with different SCM systems are comp...

This paper describes the development of an innovative timber–concrete composite bridge system and especially focuses on evaluation load tests experimental structure. The load-bearing structure was designed as glue-laminated timber beams connected with only 60-mm-thick precast deck segments made ultra-high-performance concrete (UHPC). To verify production details behavior structure, we built a f...