Results indicate that the novel method can be applied to design concrete with c120 degree. Ultra high strength concrete is now manufactured with strengths in excess of 150 mpa 21,750 psi. Ultra high strength concrete free download as powerpoint presentation. Uhpc is a class of concrete defined by its exceptionally high flexural and compressive strength.
Ultra high strength concrete using economical materials nageh n. Ultra high performance concrete uhpc is an advanced construction material that affords new opportunities for the future of the highway infrastructure. This paper presents the development of ultra high strength concrete uhsc using local materials. Ultra high performance concrete has a discontinuous pore structure that reduces liquid ingress, significantly enhancing durability. Aalborg universitet connections in precast buildings using. Highvalue concrete highstrength concrete materials 9. The term ultrahigh performance concrete uhpc refers to a relatively new class of advanced cementitious composite materials whose mechanical and durability properties far surpass those of conventional concrete. Highearlystrength concrete highearlystrength concrete, also called fasttrack concrete, achieves its specified strength at an earlier age than normal concrete. Compressive strength, porosity and sorptivity of ultra fine slag based high strength concrete p. An increase of matrix compactness by optimizing the grainsize distribution of all the powers used. Today compressive strengths exceeding 20,000 psi 140 mpa have been used in castinplace buildings. Standards supporting the building industry astm international and the global construction. Shear strength between ultrahigh performance concrete and. How to make ultra high performance concrete hunker.
The term includes a broad range of materials such as defectfree, dense particle, engineered composite, multiscale particle, and fiberreinforced cementitious. Ultra high strength concrete strength of materials concrete. Index ultrahigh performance concrete, march 2011 fhwa. Repair of steel beamgirder ends with ultra highstrength. Selfconsolidating ultrahigh performance concrete uhpc. The use and definition of highstrength concrete hsc has seen a gradual and continuous development over many years. Connections in precast buildings using ultra highstrength fibre reinforced concrete. Repair of steel beamgirder ends with ultra highstrength concrete phase ii.
The time period in which a specified strength should be achieved may range from a few 300 design and control of concrete mixtures eb001 table 171. Uhpc was first developed in the early 1980s and since then has been used for applications needing exceptional strength and durability like nuclear power plants, thinprofile bridges, structural beams and seawall anchor plates. Ultrahighperformance concrete and advanced manufacturing methods for modular construction neet1 annual meeting september 29, 2015 research team y. Engineering application of ultra high performance concrete in bridges uhpc is an advanced class of cementitious composite material composed of an optimized gradation of granular constituents, with a waterto cementitious materials ratio less than 0. Eventually, the study aims to evaluates the feasibility of vhsc columns for different ductility classes, considering the limitation of providing a higher volume of transverse. Evaluation of ultrahighperformance fiberreinforced concrete. Structural applications using ultra highstrength fiber. Recently, a new ultrahighperformance fiberreinforced concrete uhpc was introduced.
Shear strength between ultrahigh performance concrete and old concrete hassan fardoun1 2and david begg 1university of portsmouth 2department of civil engineering and surveying uk abstract. In the 1950s, concrete with a compressive strength of 5000 psi 34 mpa was considered high strength. The term ultrahigh performance concrete uhpc refers to a relatively new class of advanced cementitiouscomposite materials whose mechanical and durability properties far surpass those of conventional concrete. The possibility of achieving high strength, durability, and improved ductility with the use of ultra high strength concrete encourages researchers and engineers to use this modern material in many practical applications like nuclear waste containment structures, high rise structures, long span bridges, and walkways. One such example is ultrahigh strength fiber reinforced concrete ufc having excellent fluidity with a low waterbinder ratio, which achieves an ultra high compressive strength exceeding 180 nmm 2. Astm international construction standards supporting. In the 1960s, concrete with compressive strengths of 6000 and 7500 psi 41 and 52 mpa were produced commercially. Ultrahighperformance concrete uhpc is a class of advanced cementitious materials with greater strength, tensile ductility, and durability properties when compared to conventional or even highperformance concrete.
The mechanical properties of uhpc include compressive strength greater than 21. Jan, 2016 highvalue concrete highstrength concrete materials 9. In the 1950s, 34 mpa 5000 psi was considered high strength. Compressive strength, porosity and sorptivity of ultra fine. Coarse aggregates in high strength concrete given the critical role that the interfacial transition plays in highstrength concrete, the mechanical properties of coarse aggregate will have a more pronounced effect than they would in conventionalstrength concrete. Recently, a new ultra high performance fiberreinforced concrete uhpc was introduced. Nanosilica, ultra high strength concrete, silica fume, binder content introduction concrete is a highly heterogeneous material produced by mixture of finely powdered cement, aggregates of various sizes and water with inherent physical, chemical and mechanical properties.
Ultra high strength fiber reinforced concrete using aramid fiber. High early strength concrete high early strength concrete, also called fasttrack concrete, achieves its specified strength at an earlier age than normal concrete. This design guide serves to extend the use of concrete beyond grade 60 in the design of concrete structures using cp65. Ultrahighstrength concrete is now manufactured with strengths in excess of 150 mpa 21,750 psi. The schmidt concrete test hammers can be applied on all concrete structures such as bridges, buildings, retaining walls, bar rages and many more. For the purposes of this document, uhpc is limited to concrete that has a minimum specified compressive strength of 22,000. Pdf ultrahigh strength and performance concrete properties. Ultrahigh performance concrete uhpc is a cementitious, concrete material that has a minimum specified compressive strength of 17,000 pounds per square inch 120 mpa with specified durability, tensile ductility and toughness requirements. High strength could result in more economical structures through increasing span lengths, reducing the number of beam lines, and decreasing transportation and erection costs lane and podolny, 1993. The tests carried out have shown the possibility of using ultra high strength concrete for largescale structural concrete elements and opens new fields of applications. Mpa columns using curvature and a new flexural energybased ductility approach.
The compressive strength reaches beyond 150 mpa, which allows the construction of sustainable and economic buildings with an extraordinarily slim design. This research aims to investigate and evaluate an ultra high strength concrete uhsc cast using economical materials. However, due to the use of very fine sand instead of ordinary aggregate. Vilnius technical university, faculty of civil engineering. Ultrapanels act as wear plates over a castinplace concrete base slab, improving concrete strength and removing the need for pavement replacement. Highstrength concrete is typically used in the erection of highrise structures. Ultrapanels ultra high performance concrete mainmark. Ultrahighperformance concrete and advanced manufacturing methods for modular construction neet1 annual meeting september 29, 2015. Within the last few decades, research has been conducted on what is known as ultra high performance concrete uhpc. Ultrahigh performance concrete uhpc is a novel construction material exhibiting enhanced mechanical and durability properties, which can lead to economical construction through reducing the crosssections of structural members with associated materials savings and lower installation and labor costs tang 2004. Ultrahigh performance concrete uhpc is a new class of concrete that has superior performance characteristics compared to conventional concrete. Highstrength concrete is required in engineering projects that have concrete components that must resist high compressive loads. Ultra high strength fiber reinforced concrete using aramid. Uhsc mixture proportions were developed using local materials so that uhsc may be made more.
Ultra high performance concrete uhpc is a new class of concrete that has superior performance characteristics compared to conventional concrete. It has been shown that a reduction in concrete cover to the reinforcement is compatible with the requirements of structural applications. Pdf ultrahigh strength concrete mixtures using local. The relatively high initial cost of uhpc has restricted its wider. Ductility design of reinforced veryhigh strength concrete. High performance concrete the development of high performance concrete hpc is a giant step in making concrete a hightech material with enhanced characteristics and durability. An increase of the homogeneity of the material due to the elimination of the coarse aggregates. Ultra high strength concrete uhsc is the latest spectacular development in the domain of portland cementbased materials.
Ultrahigh performance concrete uhpc is an advanced construction material that affords new opportunities for the future of the highway infrastructure. Pdf ultrahigh strength concrete mixtures using local materials. Uhpfrc exhibits superior properties in terms of compressive behaviors, tensile behaviors, and durability. It has been used in components such as columns especially on lower floors where the loads. Application of ultrahigh performance concrete to bridge. Uhsc ultra high strength concrete the absence of coarse aggregate is considered by the inventors to be a keyaspect for the microstructure and the performance of the uhsc in order to reduce the heterogeneity between the cement matrix and the aggregate. High strength concrete are also used in other engineering strucures like bridges. Uhpc is a category of concrete characterized by high strength, low water absorption, and high resistance to waterborne and airborne chemical degradation. Mechanical properties of ultrahigh performance fiber. One of the breakthroughs in concrete technology is ultrahighperformance concrete with a steel like compressive strength of up to 250 nmm2 and a remarkable increase in durability compared even with highperformance. School of civil engineering, sastra university, thanjavur 6401, india h i g h l i g h t s effect of commercially available ultrafine slag as partial replacement to cement in high strength concrete was studied. In the decade, buildings around the world have become higher and so the structural strength demand for concrete is increased, they require high strength. Ultra high performance concrete uhpc is being adopted for a variety of different bridge construction and rehabilitation applications. The solution for these performance needs is often ultra high performance concrete.
By eliminating the coarse aggregate, improving the packing density of powders with specific grainsize distributions and using water curing at 90 c, it is possible to increase uhsc compressive strength to over 200 mpa when using mineral powders, 270 mpa with glass. Connections in precast buildings using ultra high strength fibre reinforced concrete. Fiber reinforcement architectural uhpc precast products are fiber reinforced with fibers having a minimum tensile strength of 140 ksi and a diameter of up to 300 microns. High performance vs high strength concrete concretebasics. But they are also the perfect instruments to test in tunnels e. School of civil engineering, sastra university, thanjavur 6401, india h i g h l i g h t s effect of commercially available ultrafine slag as partial. In this paper, a new proportion design method was put forward to design ultra high strength concrete with manufactured sand and the microstructure of manufactured sand ultra high strength concrete was observed. Ultrahigh performance concrete uhpc is a relatively new construction material, which is a combination of high performance concrete, minerals admixture and steel fibers. Ultra high performance concrete pathway to commercialization. Compressive strength, porosity and sorptivity of ultra.
Ultrahighperformance concrete and advanced manufacturing. Engineering application of ultrahigh performance concrete in bridges uhpc is an advanced class of cementitious composite material composed of an optimized gradation of granular constituents, with a waterto cementitious materials ratio less than 0. Application of ultrahigh performance concrete to bridge girders. This innovative material produces concrete elements that are. The federal highway administration has been engaged in research on the optimal uses of uhpc in the highway bridge infrastructure since 2001 through its bridge of the future initiative. Three different specimens geometries were considered. Ultrahigh strength concrete mixtures using local materials. Reactive powder concrete rpc, as a one of uhsc types were studied. Topics discussed include selection of materials, concrete mixture proportions, ordering, batching, mixing, transporting. Ultrahighperformance concrete uhpc is defined as concrete that has a minimum specified compressive strength of 150 mpa with specified durability tensile ductility and toughness requirements. Cip 33 high strength concrete what is high strength concrete it is a type of high performance concrete generally with a specified compressive strength of 8,000 psi 55 mpa or greater. The enhanced strength and durability properties of uhpc are mainly due to optimized. Scribd is the worlds largest social reading and publishing site. The tests carried out have shown the possibility of using ultrahigh strength concrete for largescale structural concrete elements and opens new fields of applications.
Advances in the science of concrete materials have led to the development of a new class of cementitious composites, namely. Ultrahigh performance concrete has a discontinuous pore structure that reduces liquid ingress, significantly enhancing durability compared to conventional and highperformance concretes. Concrete is the most used material in construction. Ultra high strength concrete strength of materials. According to the portland cement association, uhpc is a highstrength, highly durable, ductile material formulated by combining portland cement, silica fume, quartz flour, fine silica sand, highrange water reducer, water and steel or organic fibers. Ultrahigh performance concrete has a discontinuous pore structure that reduces liquid ingress, significantly enhancing durability. The compressive strength of uhpc used in architectural applications. Ultrapanels provide an innovative alternative solution to castinplace concrete surfaces and hard stand areas, offering costeffective and longterm repair and rehabilitation of concrete surfaces.
Advances in the science of concrete materials have led to the development of a new class of cementitious composites, namely ultrahigh performance concrete uhpc. Coarse aggregates in high strength concrete given the critical role that the interfacial transition plays in high strength concrete, the mechanical properties of coarse aggregate will have a more pronounced effect than they would in conventional strength concrete. Concrete is the most widely used material in building construction. Hemrick oak ridge national lab maria guimaraes electrical power research institute project monitoring team. The repair method consists of encasing the corroded steel area with uhpc. Arabb acivil engineering department, faculty of engineering, menoufiya university, egypt.
By improving the performance of materials and of technologies, concretes with outstanding performances were also developed, in the past two decades. Concrete is one of the necessary elements for structural work in the modern construction. Report on high strength concrete reported by aci committee 363 aci 363r10 this report summarizes currently available information about high strength concrete hsc. A novel repair method has been developed at the university of connecticut for corroded steel bridge girder ends. Highstrength concrete columns can hold more weight and therefore be made slimmer than regular strength concrete columns, which allows for more useable space, especially in the lower floors of buildings. High performance concrete is an engineered concrete obtained through a careful selection and proportioning of its constituents. More than two decades of research work on high strength concrete with fc more than 100 mpa. One of the breakthroughs in concrete technology is ultrahighperformance concrete with a steel like compressive strength of up to 250 nmm2 and a remarkable increase in durability compared even with highperformance concrete. Mixing design and microstructure of ultra high strength. This study aims to assess the bond strength and failure mode between old concrete and new concrete through slant shear test. Introduction to concrete portland cement association.
Ultra high strength concrete using economical materials. In north america, the most popular application of uhpc in bridge construction is for fieldcast closure pours betw. Jun 28, 2016 ultra high performance concrete uhpc is a novel construction material exhibiting enhanced mechanical and durability properties, which can lead to economical construction through reducing the crosssections of structural members with associated materials savings and lower installation and labor costs tang 2004. Hence, it is intended for use by engineers familiar with the design of concrete structures using particularly cp65 but who have little or no experience of high strength concrete hsc.
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