Fang and Zhang [32] conducted three-dimensional modeling of steel fiber–reinforced concrete material under intense dynamic loading, and their model well reproduced SFRC failure under contact detonations. Due to very high strength, it is possible to reduce the cross-sectional area and thus the weight of structures. While considerably more expensive than conventional concrete, UHPC is highly durable and provides excellent protection of embedded steel reinforcement. This high performance concrete can be utilized in structural rehabilitation and accelerated bridge construction in addition to several other applications. Over the past several decades, a fast development is observed on high compressive strength concrete and high ductility concrete. It has been proven that given the same water/binder ratio, UHPC with volume-based optimization can get even higher strength enhancement. [11] added nano-CaCO3 (NC) into cement paste, and the experimental results showed that NC had no effect on water requirement of normal consistency of cement. [2] examined the effects of twisted steel fiber (TF) on concrete flexural toughness, and three types of twisted fiber with different lengths and diameters were considered. Combining the revolutionary technologies of a high performance cementitious matrix and high strength fibers, Ductal is able to provide superior qualities in strength, durability and aesthetics. On the one hand, a smaller amount of raw materials is needed, but, on the other hand, the portion of energy-intensive constituents must be increased. [5] proposed spiral-shaped steel fibers, and the impact tests had demonstrated that fiber-reinforced concrete specimens reinforced with this spiral-shaped fibers displayed the largest ultimate compressive strength, the largest post-failure strength and the largest energy-absorption capacity among specimens reinforced with seven other types of fibers tested. With the development of self-compacting concrete, ultra high performance concrete and engineered cementitious composites, the volume and number of applications produced with fibre-reinforced concrete has increased. The main idea is to use ultra-high performance fibre reinforced concrete (UHPFRC) complemented with steel reinforcing bars to protect and strengthen those zones of … Pour the course aggregate into your cement mixer and … Figure 4.12. Ryu et al. Iowa’s Wapello County boasts the first ultra-high performance concrete(UHPC) highway bridge in the United States, completed in May 2006. In NSC slab, severe concrete spallation is observed on the distal surface which is induced by the blast wave propagation. The size and strength difference between the matrix and the fine aggregates are so small that under external action, the unreinforced UHPC usually has crack propagation in a straight line, which highlights the brittleness of the unreinforced UHPC. The design of UHP binder phase is based on microstructural packing-based and rheology-based criteria. As can be noted in the literature, the mechanical behavior of SFRC is mainly investigated through experimental and associated analytical studies. Author(s): G. Bernier, M. Behoul, and N. Roux. 16, July/August 2001. X-ray diffraction (XRD) analysis and X-ray fluorescence (XRF) analysis are carried out to further understand the failure element composition and strength development of this advanced material. Mix your coarse aggregate with silica fume. Besides discussion on static and dynamic material properties, UHPC samples after Split Hopkinson Pressure Bar (SHPB) tests are analyzed under Scanning Electron Microscope (SEM) Analysis to explain the macro-failure in microscale. Besides mass-based water/binder ratio, volume-based water/ultrafine particles ratio has also been established [16] for further improving the UHPC strength as shown in Fig. [7] conducted experimental analysis on effect of fiber aspect ratio on mechanical properties of steel fiber reinforced concrete, and the results revealed that the aspect ratio had an optimal value for strengths in every concrete batch. Structural designers decided to amp up the column strength to take advantage of concrete’s efficiencies and maximize the available leasable space. Over the past several decades, with the development of computer power and computational mechanics, numerical simulation of material and structural behavior under both static and dynamic conditions are becoming increasingly popular. 4.12, the results clearly demonstrated that the use of twisted steel fiber (U5B) in columns substantially reduced the mid-span displacements when compared to a typical HSRC column (H8A). Such small cracking is typical of even highly stressed UHPC; therefore, its resistance to both chloride penetration and carbonation is high. It was observed that several phenomena including statistically mechanical effects and quantum mechanical effects become pronounced as size of the system decreases. 1.2. structures. The coupled SPH and FE method can well reproduce the structural response of NSC slab and UHPC slab under various blast loading conditions. Compressive: 17,000 to 22,000 psi, (120 to 150 MPa), Flexural: 2200 to 3600 psi, (15 to 25 MPa), Modulus of Elasticity: 6500 to 7300 ksi, (45 to 50 GPa), Salt-scaling (loss of residue): < 0.013 lb/ft3, (< 60 g/m2), Abrasion (relative volume loss index): 1.7, Oxygen permeability: < 10-19 ft2, (<10-20 m2), © 2019 Portland Cement Association. UHPC typically is made with high-strength steel fibers, fine sand, cement, fly ash, a large volume of SF, and a low amount of water (a w/cm ratio less than 0.20). Ultra-high-performance concrete (UHPC) was first introduced as reactive powder concrete (RPC) in the early 1990s by employees of the French contractor Bouygues. UHPC typically is made with high-strength steel fibers, fine sand, cement, fly ash, a large volume of SF, and a low amount of water (a w/cm ratio less than 0.20). The ecological impact of UHPC structures was also compared to structures made of conventional materials. Ductal ® is a fibrous, ultra-high performance concrete (UHPC) for rainscreen cladding solutions and custom built applications like façades, roofs, sunshading or brise soleil. Ultra high strength concrete (UHSC) is the latest spectacular development in the domain of Portland cement-based materials. This paper proposes a new shear strengthening method for reinforced concrete (RC) beams, in which ultra-high-strength fibre-reinforced concrete (UFC) panels are bonded to existing structural members, and studies the strengthening effects of the method. Holland, ... L.F. Kahn, in Corrosion of Steel in Concrete Structures, 2016. In UHPC slab, microsteel fibers effectively bridge over the crack and retard the further expansion of the cracking, leading to confined spallation damage area. Fiber-reinforced concrete is studied as homogeneous material [23–28]. This is due to the fact that UHPC has drastically greater compressive and tensile strengths, as well as ductility due to high steel fiber contents. Ultra-high performance concrete has a unique combination of superior technical characteristics including ductility, strength, and durability, while providing highly moldable products with a high quality surface aspect. Among all fiber types, steel fibers are known to have higher modulus of elasticity than the concrete matrix, which means they can enhance the load carrying capacity, thus increase tensile strength of the material. High-strength concrete is designed to achieve a size efficiency of large structures and also provide extra strength safety margin. Research was carried out on plain concrete in mesoscale under dynamic loads [29–31]. T. Stengel, P. Schießl, in Eco-efficient Construction and Building Materials, 2014. high compressive loads. combine ultra high strength concrete with specified strength of Fc150 N/mm2 and ultra high strength steel with a ten-sile strength of 780 N/mm2, and they have been adopted on this building. 5.114A that both ends of the UHPCFDST specimen were fully embedded in concrete slabs and the outer face of both end slabs were restrained against x and z directions so that it can only move along the axial direction. The use of fiber in concrete matrix can reduce the concrete permeability and enhance its crack control ability. A series of tests of columns and frames in UFC buildings sub- jected to seismic forces were conducted to obtain basic data of their behavior and to provide guides for design and con-struction. Also compared to structures made of conventional materials Bernier, M. Behoul, and abrasion.... And the curing regimes on the properties of UHPC can be utilized structural... 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