2 edition of Creep characteristics of a light-weight aggregate concrete found in the catalog.
Creep characteristics of a light-weight aggregate concrete
Stephen Hayward Nathanson
Written in English
|Statement||by Stephen Hayward Nathanson.|
|The Physical Object|
|Pagination||84 leaves, bound :|
|Number of Pages||84|
No – fines concrete: It is a type of light weight concrete produced by omitting the fine aggregates from conventional concrete. This concrete has only cement, coarse aggregate and water. Due to absence of fine aggregates, concrete will have large voids, resulting in light weight. Even though there is reduction in strength, there is no. aggregate concrete. FIGURE 3: Lightweight Aggregate Concrete  AERATED CONCRETE Aerated concrete does not contain coarse aggregate, and can be regarded as an aerated mortar. Typically, aerated concrete is made by introducing air or other gas into a cement slurry and fine sand. In commercial practice, the sand is replaced by pulverized-File Size: KB.
Characteristics of Light Weight Aggregate and its Application in Concrete Filled Steel Tubes. Prabhakaran K. 1, PadmaPriya V. 2 1,2. Department of Civil Engineering, SRM University, INDIA ABSTRACT Concrete Filled Steel Tubes (CFST) comprises of steel hollow section of circular or rectangular or square shape filled with plain or reinforced File Size: KB. Properties of Concrete Concrete is an artificial conglomerate stone made essentially of Portland cement, water, and aggregates. Properties of Concrete While cement in one form or another has been around for centuries, the type we use was invented in in Britain. It .
Lightweight aggregate concrete. This forms the bulk of lightweight concrete on site and can be used as a structural material. The density depends on the type of grading of the aggregates used, the moisture content and the mix proportions. The fines can be natural sand or crushed lightweight coarse aggregate. Some research on creep and drying shrinkage of lightweight aggregate concretes has been reported in the literature [1, 2, 3, and 4].1 However, it was felt that a large group of the lightweight and normal-weight aggregates, representative of those being used in the construction industry, should beCited by:
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Actually, a very extensive study of these properties—NBS Monogr Creep and Drying Shrinkage of Lightweight and Normal- Weight Concretes—shows creep to be comparable to most normal weight concrete and, on an average, shrinkage to be only moderately greater.
In some areas, lightweight structural concrete is being specified because it has less shrinkage cracking potential than normal. determine y the creep and shrinkage characteristics of lightweight-aggregate concrete used in the State of Iowa. This report is concerned with Phase 1 of the Project as described in the Prospectus for the project submitted in November of "The State Highway Commission is planning to conductFile Size: 1MB.
Concrete creep is defined as: deformation of structure under sustained load. Basically, long term pressure or stress on concrete can make it change shape.
This deformation usually occurs in the direction the force is being applied. Like a concrete column getting more compressed, or a beam bending. Creep does not necessarily cause concrete to fail or break apart. Chaipanich, P. Chindaprasirt, in Eco-Efficient Masonry Bricks and Blocks, Types of lightweight concrete.
Lightweight concrete can be classed according to its unit weight or density, which normally ranges from to kg/m 3, according to the ACI Committee Guide for Structural Lightweight Aggregate Concrete (ACI).There are three different lightweight concrete type.
Two high-performance lightweight concrete (HPLC) mixtures with average compressive strengths of and MPa ( psi) were developed. Their air-dry unit weights were and kg/m3 ( and lb/ft3), respectively. Twenty-six creep specimens were loaded at 16 or 24 h to 40 or 60% of their initial by: 1. Introduction.
In the processes of electrical energy generation in coal-burning power plants that consume pulverized solid fuels, cenospheres are produced as one of the solid residues that, as a result of their characteristics and properties, could be used as aggregate in Cited by: Lightweight aggregate concrete may be very different from normal weight concrete from this point of view.
The properties mainly depend on the properties of the lightweight aggregate like particle density, water absorption capacity. The aim is to study the impact of the time under water storage on compressive strength and fracture tests results. produced an aggregate grading suitable for making light-weight concrete (ESCSI ).
Commercial production of expanded slag began inand in the first structural-quality, sintered-shale, lightweight aggregate was produced using shale in eastern Pennsylvania.
One of the earliest uses of reinforced lightweight concrete. of creep and shrinkage for high performance light weight aggregate concrete with rapid hardening high strength cement have conducted and the results are discussed with comparison to the design codes to study such basic properties. Keywords: high performance lightweight aggregate, creep, shrinkage.
Creep results showed that the creep strain of concrete and the concentrations of K⁺, Ca²⁺, Na⁺, Mg²⁺ and Sr²⁺ in the concrete solution increased significantly with the increase of PS. Two high-performance lightweight concrete (HPLC) mixtures with average compressive strengths of and MPa ( psi) were developed.
Their air-dry unit weights were and. Lightweight aggregate concrete (LWAC) There are a variety of lightweight aggregates that can be used in the production of LWAC, such as natural materials, like volcanic pumice, and the thermal-treated natural raw materials like expanded glass, clay, shale, etc.
LECA is an example of expanded clay and Poraver is an example of expanded glass : Saman Hedjazi. The American Concrete Institute. Founded in 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 consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design.
Purchase Lightweight Aggregate Concrete - 1st Edition. Print Book & E-Book. ISBNSome common and main types of concrete are: The concrete in which common ingredients i.e. aggregate, water, cement are used is known as normal concrete.
It is also called normal weight concrete or normal strength concrete. It has a setting time of 30 - 90 minutes depending upon moisture in atmosphere, fineness of cement etc. Two chapters deal with the microstructure of lightweight aggregate concrete and the significant physical characteristics, such as shrinkage and creep.
Subsequent chapters cover the important topics related to in-service behaviour of light-weight aggregate concrete. The basic design for lightweight concrete is covered in Eurocode 2 Partwith section 11 having particular rules required for lightweight aggregate concretes.
Concrete is considered to be lightweight is the density is not more than kg/m 3 (the density of normal weight concrete is assumed to be between kg/m 3 and kg/m 3) and a. characteristics of these lightweight aggregates are correlated with thermal conductivity and resistance of concrete slabs made with the lightweight aggregates.
Versaliteª is a manufactured lightweight aggregate, which is currently produced from spray dryer ash (SDA) in King George, Virginia. The thermal conductivity and resistance of the concreteFile Size: 2MB. 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.
The SLWAC mix design is more complex than that of normal weight concrete as more parameters need to be determined. Taking this into account, a simplified design method is proposed for SLWAC Cited by: tion of fine and coarse lightweight aggregate or coarse light-weight aggregate and normalweight fine aggregate.
Com-plete replacement of normalweight fine aggregate with a light-weight aggregate will decrease the concrete density by ap-proximately 10 lb/ft 3 ( kg/m).
Designers recognize that structural lightweight concrete will. Lightweight concrete mixture is made with a lightweight coarse aggregate and sometimes a portion or entire fine aggregates may be lightweight instead of normal aggregates. Structural lightweight concrete has an in-place density (unit weight) on the order of 90 to lb / ft³ ( to kg/m³).
Normal weight concrete a density in the range. Factors affecting creep Aggregate properties: The higher the modulus of elasticity the less is the creep.
Light weight aggregate shows substantially higher creep than normal weight aggregate. Factors affecting creep Aggregate properties: Fine aggregates Coarse aggregates In addition, the microstructures of day concretes were examined by using the FE-SEM technique.
The test results indicated that recycled coarse aggregate concrete (RAC) showed a lower performance than crushed stone aggregate concrete (CAC) because of the adhered mortars in RA.