This code contains tables and graphs to serve as a guide in the process of selection of mix ingredient of concrete. Taking this into account, a simplified design method is proposed for slwac. Cellular lightweight concrete seminar report, ppt, pdf. The aerated concrete was perfected in the mid1920, by swedish architect and inventor dr. The mix designs in the following pdf are based upon an estimated active water demand. Determine the mean target strength ft from the specified characteristic compressive strength at 28day fck and the level of quality control. Study of lightweight concrete behaviour lightweight concrete can be defined as a type of concrete which includes an expanding agent in that it increases the volume of the mixture while giving additional qualities such as nailbility and lessened the dead weight. Researchers have supported the need to present mix design data in form of graphs or equations hover, 1995. 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.
Aerated concrete is a lightweight concrete which is made by introducing air or gas into a cementbased mortar. Structural lightweight aggregate concrete mix design, materials properties and production. Concrete structures are prone to earthquake due to mass of the structures. Equations for mix design of structural lightweight concrete 3 guide the mix designer, it is thought worthwhile to add more values to these data for convenience of the users.
The mix design of lightweight concrete is generally. Structural lightweight concrete containing sintered fly ash lightweight aggregates were produced. During the 1950s, many multistory structures were designed from the foundations up, taking advantage of reduced dead weight using lightweight concrete. Structural lightweight concrete mixtures can be designed to achieve similar strengths as normal weight concrete. Structural lightweight aggregate concrete nordic concrete. Mix designs structural concrete norlite lightweight. Rational mix design of lightweight concrete for optimum. Lightweight concrete, density, unit weight, curing, splitting. For mix design of structural lightweight concrete, standard practice for selecting proportions for structural lightweight concrete aci 211. This mix design tool is based on the insight that superior properties of a granular mix are achieved when a socalled geometric grading curve is designed and. Explore cellular lightweight concrete with free download of seminar report and ppt in pdf and doc format. Extra care should be taken when designing lightweight and mediumweight mixes.
Download lightweight concrete seminar reports, abstract. Materials free fulltext lightweight concrete produced. High carbon ash, recycled aluminum waste and zeolite powders are additional mechanical structures suitable in the production of cellular lightweight concrete. How to make lightweight concrete using styrofoam hunker. As a result, a mix design for producing lightweight scc had a lower volume fraction of lightweight aggregates and thus higher unit weight. Perlite concrete, while not usually suited for structural or load bearing uses, offers many advantages beyond its lightweight. Pdf strength of lightweight concrete jaber h a s s a n. Design related issues with lightweight concrete vdot. The purpose of this report is to investigate the types, advantages, mechanical properties of lwc. Lightweight aggregate concrete properties, uses and. The primary use of structural lightweight concrete slwc is to reduce the dead load of a concrete structure, which allows the structural designer to reduce the size of the structural members like beam, column, and footings which results in reduction of earthquake forces on the structure. Standard specifications for airentraining admixtures for concrete, astm designation. This report presents the results of the investigation of the response of lightweight concrete to elevated.
As concrete buildings go ever higher and concrete spans become longer and longer, the use of lightweight aggregate structural concrete is growing. Estimation of the strength development of concrete. Perlite concrete also has sound deadening properties, and is thermal insulating as well, depending on mix design. Considering its light weight of structure and ease of placement, lightweight selfcompacting concrete lwscc may be the answer to the increasing construction requirements of slender and more heavily reinforced structural elements. Suggested mix proportions for norlite structural lightweight concrete watercement ratio. These results provide guidance for design of concrete materials with reduced density. Current design methods for structural lightweight aggregate concrete slwac are usually only valid for a limited range of concrete compositions that have previously been subjected to trial tests. Lightweight concrete, as far as this article is concerned, is a concrete having a 28 day compressive strength is excess of 2,000 psi, and an air dry unit weight less than 115 pounds per cubic foot. An experimental study on floating concrete using light. Definition concrete which uses lightweight aggregates may consist of lightweight aggregates are used in ordinary concrete of coarse aggregate and sand, clay, foamed slag, clinker, crushed stone, aggregates of organic and inorganic. Pdf lightweight concretes are widely accepted in the construction industry mainly due to its low density.
C 260, and a water reducing admixture conforming with the requirements of standard specification for chemical admixtures for concrete, astm designation. An intensive literature survey on light weight concrete has been carried out to seek references to the use of polystyrene in concrete mixes, more than 3000 websites. This research project investigated lightweight portland cement concrete batching procedures and developed guidelines for designing poraverbased mixes. This video animation, animated video explains the concept of lightweight concrete. Aci 2r14 guide for structural lightweightaggregate concrete author. High performance structural lightweight concrete utilizing natural perlite aggregate and perlite powder submitted by hasan eser in partial fulfillment of the requirements for the degree of master of science in civil engineering department, middle east technical university by, prof. Lightweight concrete mix design laboratory assignment procedure 1 follow the lightweight concrete mix design procedures from one of.
There are different recipes to make lightweight concrete depending on the coarse aggregate used and the required strength of the end product. Lightweight concrete, light weight concrete civil engineering animated videos. Founded in 1904 and headquartered in farmington hills, michigan, usa, the american concrete institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensusbased standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design. Chapter 4 proportioning structural lightweight concrete. Because lightweight concrete is often projectspecific, contacting the aggregate supplier before project design is advised. Design proposals for reinforced concrete corbels alan h. The slwac mix design is more complex than that of normal weight concrete as more parameters need to be determined. These cells may account for up to 80% of the total volumne. Researches had been conducted worldwide on a large number of natural or artificial lightweight aggregates 2. Performancebased concrete pavement mix design system the final product of this track will be a practical yet innovative concrete mix design procedure with new equipment, consensus target values, common laboratory procedures, and full integration with both structural design and field quality control a lab of the future. Pdf experimental study on lightweight aggregate concrete. All the concretes have densities less than 2000 kgm 3 a new mix design methodology was proposed and has the capability to produce compressive strength up to 70 mpa. Cip 36 structural lightweight concrete what is structural lightweight concrete structural lightweight concrete has an equilibrium density ranging from 90 to 120 lbft3 31440 to 1840 kgm compared to normalweight concrete with a density in the range of 140 to 150 lbft 3 2240 to 2400 kgm.
Lightweight concrete mixture is made with a lightweight coarse aggregate and sometimes a portion or entire fine. Lightweight concrete, also known as epscrete expanded polystyrene concrete, is a material widely used in the building of environmentally green homes. Mix design and properties of fly ash waste lightweight. The study recommends that fresh concrete densities be used in designing for dead load computations of lwc. Mattock professor of civil engineering and head, division of struct 1as and mechanics university of washington seattle, washington this paper presents design proposals for reinforced concrete corbels, based upon conclusions drawn from recent experimental studies of the behavior of. An intensive literature survey on light weight concrete has been carried out to seek references to the use of polystyrene in concrete mixes, more than 3000 websites were visited over the internet, nothing was directly. This design innovation resulted in a lightweight insulating concrete system that is viableeven advantageousfor use in reroofing applications. One of the main challenges in designing lightweight concrete is to adapt most of design, production and execution rules since they often deviate.
Polystyrene lightweight concrete polyconcrete zaher kuhail. Structural design of lightweight concrete members relies on the equilibrium density. Lightweight concrete produced using a twostage casting process. The equations are also useful for mixture proportioning adjustment. Though it is called aerated concrete, it is really not a concrete. Using less sand can make the product lighter, but it can also make the concrete weaker structurally. Minimizing the density obviously requires a higher volume fraction, but this usually causes aggregates segregation in a conventional mixing process.
Equations for mix design of structural lightweight concrete. The substance is often made using small styrofoam balls as a lightweight aggregate instead of the crushed stone that is used in regular concrete. Lightweight aggregates are used as insulating fill within the cavities of concrete masonry units to decrease. Designing a lightweight structural concrete mix concrete. The mix design techniques described above can be used to design mixes for normalweight, mediumweight, and lightweight units. A simple recipe for basic lightweight concrete is to combine 8 parts sand, 8 parts cement and 8 parts.
Experimental investigation on lightweight concrete slabs ijrte. That portion absorbed by the aggregate is not considered for determining yield since it has no volumetric effect. Aci 2r14 guide for structural lightweightaggregate. If a calculated blend contains too much or too little lightweight or mediumweight aggregate, the desired density might not be achieved. Rational mix design of lightweight concrete for optimum strength by eethar th. The building code requirements for structural concrete code covers the materials, design, and construction of structural concrete used in buildings and where applicable in nonbuilding structures. Pdf development of lightweight concrete for structural.
Taking this into account, a simplified design method is proposed for slwac made with. The type of lightweight aggregate and its volume fraction in a mix determine the density of lightweight concrete. Design methodology for the design of the lwac, a mix design methodology previously used for normal density mortars and concretes was considered 20. Proportioning and characterization of lightweight concrete mixtures. Structural lightweight concrete mixtures can be designed. This chapter focuses on several applications of lightweight aggregate concrete lwac. Laboratory investigation of lightweight concrete properties vdot. Seismic performance of lightweight concrete structures. Mix design of lightweight selfconsolidating concrete using new zealand pumice jamal almulla wilco precast ltd summary pumice is a volcanic aggregate that has been used to produce lightweight concrete for many. Preliminary design guidelines for poraverbased lightweight. The primary use of structural lightweight concrete is to reduce the dead load of a concrete structure, which then allows the structural designer to reduce the size of columns, footings and other load bearing elements. This paper proposes a twostage casting process to produce a lightweight concrete. Cip 36 structural lightweight concrete what is structural lightweight concrete. 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.