The lightweight concrete made using this type of aggregates is more than 21% lighter than normal weight granite and dacite aggregate concretes. Highstrength lightweight concrete mixtures based on hollow. All the results were based on the 75% foam injected in the mixture. Mechanical properties of high strength semilightweight aggregate. Explore cellular lightweight concrete with free download of seminar report and ppt in pdf and doc format. The proposed specifications are designed to help highway agencies evaluate between comparable designs of lightweight and normal weight concrete bridge elements so that an agencys ultimate selection will yield the greatest economic benefit. In 1971, the one shell plaza pierced the texas skyline, breaking the city record for tallest building. Pdf mechanical properties of steel fiberreinforced, high. High strength lightweight concrete made with scoria aggregate containing mineral admixtures article pdf available in cement and concrete research 3310. This classification of structural lightweight concrete is based on a minimum strength. Copy the html code below to embed this book in your own blog, website, or application. Section 6 design for fire resistance of the new zealand standard for concrete stmcture nzs3101, 1995 provides recommended values and minimum requirements. The concrete mixtures incorporate either basalt or crushed limestone, aggregate sizes of 12 mm h in.
The main difference between lightweight concrete and other types of concrete is its composition. Pdf highstrength highperformance lightweight concrete. In this paper, three different kinds of steel fibers, being micro m, endhooked h, and corrugated c, commonly used in engineering applications, are added to highstrength lightweight aggregate concrete hlac to study the effects of steel fiber and volume content ratio of fiber on the compressive, splitting tensile, and flexural strength of hlac. Highperformancehighstrength lightweight concrete for. Concrete with a wc in this range is also not covered in the american association of state highway and traffic officials aashto loadand. Lightweight concrete types, classification, uses and advantages. Figure 2 shows the compressive strength of aerated lightweight concrete according to the percentage of foam in each mixture. The paper presents the results of research aimed at development of nanomodified highstrength lightweight concrete for construction. The benefits of using structural lightweight concrete in construction industry, particularly in high rise buildings, over normal weight concrete are numerous. First use of lightweight highperformance concrete beams in virginia 1. Compressive strength of high strength lightweight aggregate concrete mpa specimen size and shape curing condition age days 3 7 28 56 90 100mmcube moist air 2 1 8 37. Pdf this paper determines mix proportions of highstrength structural lightweight concrete hsslwc, which reduces the weight of concrete by using. Pdf mechanical properties of steel fiberreinforced. High strength lightweight concrete made with ternary mixtures of cementfly ashsilica fume and scoria as aggregate.
For the highstrength lightweight concrete, the shape of. Highstrength lightweight concrete has unique performance characteristics. The other property is the better performance of lightweight concrete in fire tests, because of its improved insulation characteristics. An uncorrected copy, or prepublication, is an uncorrected proof of the book. It can be seen that the mixture with 25% of foam is higher than the compressive strength of 100% foam. With normalweight concrete, high strength or high performance is ordinarily defined as concrete with strengths ranging from 8000 to 12,000 psi. Lightweight concrete lwc is a most interesting field of research and has been widely used in buildings since ancient times. The permeability of high strengthlightweight concrete appears to be very low, but it may be higher than that of normal weight concrete at a similar. This concrete has a water to cement ratio of less than 0. Properties of high strength tuff lightweight aggregate. It is shown in the article that the preparation of highstrength lightweight. High strength lightweight aggregate concrete using blended. The density unit weight of such concrete determined in the dry state should not exceed 1840 kgm.
Structural lightweight concrete plays an important role in the construction industry, especially for the highrise buildings. The use of high strength lightweight concrete hslw can provide the same spans at a 20% reduction in weight. Information on the mechanical properties of highstrength lightweight concrete up to 100 mpa with a corresponding density of 1865 kgm 3 is presented. 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.
It can range from onehalf to threefourths of the evalue of normal weight concrete at a given strength level, depending on the weight of the concrete. Properties of highstrength lightweight concrete using manufactured. This paper presents basic information on the mechanical properties of steel fiberreinforced, highstrength, lightweight concrete with compressive and flexural strengths up to 85. Five different types of lightweight aggregates were investigated, and the strength of the aggregate appears to be the primary factor controlling the strength of the high strength lightweight. Concrete with a wc in this range is also not covered in the american association of state highway and traffic officials aashto loadandresistance factor design. Notwithstanding the relatively low strength of lightweight.
Lightweight high performance concrete for bridge decks. Properties of lightweight concrete for construction works. Properties of high strength tuff lightweight aggregate concrete. Introduction lightweight concrete lc has been progressively used in structures such as largespan bridges, highrise buildings and o shore oil platforms, owing to its superior characteristics in density, speci. Concrete, highstrength lightweightstructural lightweight concrete with a 28day compressive strength of 6000 psi 40 mpa or greater. Structural lightweight concrete has an inplace density unit weight on the order of 90 to 115 lb ft 3 1440 to 1840 kgm compared to normalweight concrete with a density in the range of 140 to 150 lb ft 3 2240 to 2400 kgm. Review of the new zealand standard for concrete structures. Sakrete highstrength concrete mix is a preblended mixture of sand, coarse aggregate, and cementitious materials. Understanding structural lightweight concrete concrete. The tensile compressive strength ratio appears to be lower for highstrength lightweight concrete than that for highstrength normal weight concrete, and the elastic modulus, which varied from 17. 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.
Concrete, insulating insulating concretes are very light non structural. Cellular lightweight concrete seminar report, ppt, pdf. Compressive strength and microstructural properties of. Advantages and disadvantages of lightweight concrete. Hollow aluminasilicate microspheres with nanoscale modifier are used for obtaining these properties. An extensive testing program was conducted on concrete specimens to determine fresh properties such as slump, slump flow, unit weight, air content and setting time. This fact induces a very brittle behaviour, which is independent of the strength. Pdf highstrength lightweight concrete using leca, silica fume.
In this paper the tensile strength of lightweight aggregate concrete lwac produced with different types of expanded clay aggregates is characterized. To increase the durability of adhesion between cement stone. Preparation and research of the highstrength lightweight. Pdf mechanical properties of highstrength lightweight. This design guide serves to extend the use of concrete beyond grade 60 in the design of concrete structures using cp65. The ratio of specified compressive strength to density psi lbft. Typically, a lightweight aggregate concrete with 28day compressive strength more than 40 mpa is considered as high strength lightweight concrete. Spexcrete high strength 8000 underlayment is a selfleveling wear surface that is polishable. It has a high specific strength strengthtodensity ratio above 41 kpakg. For structural applications the concrete strength should be greater than. Also explore the seminar topics paper on cellular lightweight concrete with abstract or synopsis, documentation on advantages and disadvantages, base paper presentation slides for ieee final year civil engineering ce or ieee civil construction btech, be, mtech students for the year 2017. Pdf highstrength lightweight concrete made with scoria.
High strength lightweight concrete has unique performance characteristics. These cells may account for up to 80% of the total volumne. The modulus of elasticity of lightweight concrete differs from normal weight concrete. The developed concretes are of low average density and high ultimate compressive strength. The aci building code uses this formula for estimating the evalue of both types of concrete in composite design, the modular ratio, n esec, is important. It has many advantages such as better heat insulation, sound absorption, fire and frost resistance and increased seismic damping aslam et al. Beginning in the late 1950s, fracture mechanics of concrete and concrete structures. Lightweight concrete was used to reduce foundation loads estimated 10% reduction in piles for main piers also reduced foundation size lightweight concrete deck fc 5,000 psi with max. Therefore, the ulcc can be considered as a highstrength lightweight cementitious composite. Applications of highperformance lightweight concrete in. The lighter the concrete, the greater are the differences to be accounted for in the properties of the concrete.
Structural lightweight concrete achieve similar strength, mechanical and durability properties as normalweight concrete. Generally speaking, concrete in this range of strength and weight is produced with expanded shales, clays. High strength lightweight aggreg ate concrete dipl. The ultimate strain at peak load for the concrete varied from 3. The judicious use of these materials has resulted in concrete compressive strengths exceeding 100 mpa. Structural lightweight concrete has an equilibrium density ranging from 90 to 120 lbft3 3 1440 to 1840 kg m compared to normalweight concrete with a density in the range of 140 to 150 lbft 3 2240 to 2400 kg m. The physical and mechanical properties of highstrength lightweight concrete. Mechanical properties of highstrength lightweight concrete. In this paper, three different kinds of steel fibers, being micro m, endhooked h, and corrugated c, commonly used in engineering applications, are added to high strength lightweight aggregate concrete hlac to study the effects of steel fiber and volume content ratio of fiber on the compressive, splitting tensile, and flexural strength of hlac.
We publish prepublications to facilitate timely access to the committees findings. The permeability of high strength lightweight concrete appears to be very low, but it may be higher than that of normal weight concrete at a similar. The experiment was designed to create a lightweight, high strength portland cement concrete. Structural lightweight concrete provides a more efficient strength to weight ratio in structural members. The first modern use of highperformance lightweight concrete is when a lightweight concrete ship was built in 1917 to 1920 using 35 mpa concrete. Lwa lww, a concrete with dry coarse lwa lwd, and a reference concrete with nwa. It is shown in the article that the preparation of high strength lightweight. The first modern use of high performance lightweight concrete is when a lightweight concrete ship was built in 1917 to 1920 using 35 mpa concrete. Ismailhead mohamad shazli fathi norpadzlihatun bte manaf. Focused were on the performance of aerated lightweight concrete such as compressive strength tests, water absorption and density and supplementary tests and comparisons made with other types of lightweight concrete. Oilpalmboiler clinker opbc is a solid waste from the oil palm.
Experimental study of highstrength steel fiber lightweight. The value of the unit weight of high strength tuff lightweight aggregate concrete used in this study 1 using lightweight tuff aggregates, and normal techniques, it was possible to produce high strength concrete with a cube compressive strength of 5560 mpa at 90 days, with a unit weight of 1880 kgm 3. A mixture of portland cement, water, sand, and aggregate was formulated to produce a concrete cube with the highest ratio of compressive. The effects of aggregate type, size, and content on the behavior of normal and highstrength concrete, and the relationships between compressive strength, flexural strength, and fracture energy are discussed.
Gert konig 2 university of leipzig, institute for structural engineering and building material d04109 leipzig summary one research field in leipzig deals with the design of high strength lightweightaggregate concretes hslwac. Flashag new lightweight aggregate for high strength and. Mpa at 28 days is classified as high strength lightweight concrete. Pdf manufacturing of highstrength lightweight aggregate. At the same time, flashag concrete is about 15% to 21% stronger than highstrength normal weight aggregate concretes. The use of this quality mixture, ensuring your finished project will last you for years to come. The influence on the splitting tensile strength and modulus of. Development of high strength lightweight concrete for structural. It is shown that to produce this type of concrete one need to use hollow glass and aluminosilicate microspheres. For all hslwacs high strength mortar matrix are used so that in general the concrete strength will be limited by the efficiency of the aggregates. Five different types of lightweight aggregates were investigated, and the strength of the aggregate appears to be the primary factor controlling the strength of the highstrength lightweight. High strength lightweight aggregate concrete using.
It can only be produced using lightweight aggregates. Pdf mechanical properties of highstrength lightweight concrete. Compressive strength of the lwc at 56 days was from 68. Highearlystrength concrete highearlystrength concrete, also called fasttrack concrete, achieves its specified strength at an earlier age than normal concrete. Tensile strength of structural expanded clay lightweight. Information on the resistance of high strength lightweight concrete 50 to 100 mpa to water penetration and accelerated chloride penetration is presented.
Advantages and disadvantages of lightweight concrete giatec. Conference paper pdf available august 2011 with 2,229 reads. Lightweight concrete can be specified using the notation lc for the strength class, e. Jul 15, 2014 in this paper the tensile strength of lightweight aggregate concrete lwac produced with different types of expanded clay aggregates is characterized. Flexural fatigue behavior of ultralightweight cement. This research hasnt been cited in any other publications. Structural lightweight concrete has an inplace density unit weight on the order of 90 to 115 lb ft 3 1440 to 1840 kg m compared to normalweight concrete with a density in the range of 140 to 150 lb ft 3 2240 to 2400 kg m. Concrete, highstrength lightweightstructural lightweight concrete with a 28 day compressive strength of 6000 psi 40 mpa or greater.
Information on the mechanical properties of high strength lightweight concrete up to 100 mpa with a corresponding density of 1865 kgm 3 is presented. Lightweight, high strength, reinforced concrete constructions formed of a plurality of substantially coextensive, parallel, spaced apart membranes consisting of alternate, integrally bonded layers of fiberreinforced epoxy resin and epoxy resincontaining concrete interconnected by continuous longitudinal and lateral transverse webs of epoxy resincontaining concrete that form a unitary. For the highstrength lightweight concrete, the shape of the. High strength is achieved in lightweight concrete by incorporating various pozzalans with midrange water reducing admixtures. Typically, through the incorporation of various pozzolans and water reducers, high strength lightweight aggregate concrete hslwac has a compressive strength range of between 34 and 69 mpa. The paper presents the results of research aimed at development of nanomodified high strength lightweight concrete for construction. This 52storey building broke another record as the worlds tallest building made of lightweight concrete. Lightweight concretes are designed for nonstructural uses such as insulation, decorative uses and sound reduction. A new method of producing high strength oil palm shell. High strength tuff lightweight aggregate concrete table 4. Apr 12, 2018 lightweight concrete costs more to produce. Factors affecting durability of lightweight concrete and its remedies. The marginally higher cost of the lightweight concrete is offset by reduced size of structural.
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