Nano-silica is an important admixture for ultra-high performance concrete (UHPC). However, complex production process and agglomeration problem of conventional nano-silica significantly limit its application in UHPC. In this study, a novel highly dispersed colloidal olivine (C-OnS) developed. The properties C-OnS are characterized with laser light scattering, nuclear magnetic resonance zeta-pot...

Abstract The phenomenal strides in the modifications and use of supplementary cementitious materials conjunction with superplasticizers discrete fiber distributions concrete made it possible to arrive at structural material termed as “ultra-high performance concretes” (UHPC) or its extension reinforced (UHPFRC). Its development heralded a new era, opening vistas configurations forms that could ...

In this paper, the mechanical performance of an ultra-high-performance concrete (UHPC) repaired cementitious composite system, including old matrix and new reinforcement (UHPC), under various high temperature levels (20 °C, 100 300 500 °C) was studied. UHPC reinforced with different contents steel fibers polypropylene (PP) utilized. Moreover, physical, compressive, bonding, flexural behaviors s...

Ultra-High Performance Concrete (UHPC) is a new class of concrete that differentiates itself from other materials due to its exceptional mechanical properties and durability. It has been used in structural rehabilitation accelerated bridge construction, precast applications, several applications the past decades. The UHPC include compressive strength greater than 124 MPa (18 ksi) sustained post...

In this paper iron tailing sand (TS) are used as aggerate to develop ultra high-performance concrete (UHPC). The mix proportion of UHPC is designed and TS were added by 25%, 50%, 75% 100% (wt.%, i.e., weight percentage) replace natural river sand. Firstly, the influence on slurry behavior was carried out. experimental result indicates that with continuously increasing content TS, workability de...

The objective of this paper is to propose and illustrate feasibility, approach, validation as per prevailing codes design standards, specification rehabilitate bridge pier cap by using Ultra-High Performance Concrete (UHPC). evaluation existing caps bearings indicates that the complete removal bearing undesirable due 1) massive size 2) difficulty in cutting through thick components 3) deeply an...

Abstract Ultra High-Performance Concrete (UHPC) has good mechanical strength and durability, so it can be the solution for an overlay material old materials that need to renewed. The problem with using UHPC as a construction is high price sustainability, partial replacement cement required reduce production costs, energy consumption, CO 2 gas emissions. Bonding performance important parameter m...

Abstract This research proposed the modular prefabricated permanent formwork system made of ultra-high-performance concrete (UHPC). Two kinds shapes were designed: flat and ribbed. The experimental investigation on axial compression performance composite columns that consist normal strength (NSC) core UHPC was demonstrated. Compared with formwork, ribbed exhibited better bonding NSC core. As ob...

Ultra-high performance concrete (UHPC) is an appropriate material to repair and rehabilitate aged structures due its excellent properties, such as high compressive strength durability. Several studies have demonstrated the effectiveness of applying UHPC in old buildings a rehabilitation or material, but bond between concretes needs more investigation. In this sense, normal-strength (NSC) curren...