Ultra-High Performance Concrete (UHPC) exhibits high autogenous shrinkage (AS) which significantly increases the risk of early age cracking. To predict risks cracking environmentally friendly CEM III-based UHPC, a numerical model originally developed for crack assessment ordinary concrete, has been further and applied on demonstration wall with cracking, cast non-deforming slab. The design was ...

Durability characteristics of high-performance concrete (HPC) and ultra-high performance (UHPC) are evaluated in comparison to normal strength (NSC). HPC UHPC cast using commonly available materials with no special heat treatment. Concrete resistivity, rapid chloride permeability, sorptivity, porosity, resistance migration carbonation these three types assessed. Microstructure hydration product...

Ultra-high-performance concrete (UHPC) is a kind of structural material with ultra-high strength, extremely low porosity, and excellent durability, which has broad application prospects. In order to promote the UHPC constrained by carbon fiber-reinforced polymer (CFRP) sheets as strengthening in practical engineering, total nine specimens were designed, two kinds layer thickness (35 mm 45 mm, r...

This article develops an enhanced UHPC-grout shear connection for steel-concrete composite bridges with precast decks. The primary improvement is the use of ultra-high performance concrete (UHPC) as grout. To validate constructability and mechanical new connection, two series experimental tests (including grouting push-out tests) were conducted. Results from show that both pressure method self-...

A novel double-axis vibration mixing technology is presented to further enhance the performance of ultra-high concrete (UHPC). It improves problem inefficient zone in and enhances homogeneity through coupling velocity fields during mixing. The X-CT scan results demonstrate that this fiber distribution coefficient from 0.512 0.581. Moreover, standard deviation orientation reduced, proportion inv...

In the exploratory study presented in this paper, an attempt was made to develop different mixtures of ultrahigh performance concrete (UHPC) using various locally available natural and industrial waste materials as partial replacements of silica fume and sand. Materials such as natural pozzolana (NP), fly ash (FA), limestone powder (LSP), cement kiln dust (CKD), and pulverized steel slag (PSS),...

This paper reports on double shear push-out tests conducted steel-to-ultra-high-performance concrete (UHPC) connections based studs of 30- or 22-mm diameter in slabs 35, 55, 150 mm thickness. The results show that with an increase stud diameter, the longitudinal strength has improved by 25% and 94% for ultra-short long (of aspect ratios below equal to 4.0), respectively. For short studs, both r...

Ultra-high performance concretes (UHPC) are advanced cement-based materials characterised by superior mechanical properties with respect to normal and high-strength concretes; however, their dense compact matrix can facilitate the onset of spalling at high temperatures. This problem is often coped up adding polypropylene (PP) fibres mix design, alone or other types fibres; steel enhance materia...

Ultra-high-performance concrete (UHPC) is a kind of building material with ultra-high strength, toughness, and durability. However, under the conditions ordinary molding technology, most fibers cannot play bridging role in direction force. In this study, UHPC specimens different steel fiber contents (0%, 2%, 4%, 6% by volume) directional reinforced were prepared. Based on split-Hopkinson pressu...