Advantages of using concrete hollow blocks an innovation in. Pdf hollow block masonry materials for construction jade. Compressive strength of concrete blocks or concrete masonry units are required to know the suitability of these in construction works for various purposes. They have an inner void area which is greater than 25% of their gross area and are available in various sizes and shapes.
While concrete blocks vary by type, their primary structural property is compressive strength. The total void area can amount to 50% of the gross crosssectional area. Introduction these are the concrete blocks either hollow or solid. They may be used for both load bearing as well as non load bearing walls. Blocks shall be of work size 190 mm high, 390 mm long and 290 mm190 mm140 mm 90 mm thick, and shall be solid unless detailed otherwise. Commonly used in the construction industry, concrete hollow blocks are usually manufactured using lightweight aggregates with a certain design load depending on the nature of member it will be used into. These concrete hollow blocks are more useful due to its lightweight and the most important feature is ease of ventilation. Pick up the blocks and spread a full bed of quikrete mortar mix or mason mix on the footing.
Though the strength of wall constructed with hollow concrete block give the less strength as compared to crick masonry but cost of construction is very less. Pdf the article discusses the results of experimental investigation of highly hollow concrete block masonry and concrete infill block masonry. These are the concrete blocks either hollow or solid. Where hollow block work is specified for work above dampproof course level, the blocks shall have two voids running vertically. Testing of concrete masonry blocks for compressive strength. The common size of concrete blocks is 39cm x 19cm x 30cm or 20 cm or 10cm or 2 inch, 4 inch, 6 inch, 8 inch, 10 inch and 12inch unit configurations. The blocks and bricks are made out of mixture of cement, sand and stone chips. Concrete masonry units a concrete masonry unit is a preformed building unit of rectangular shape that is intended for use in the construction of bonded masonry walling. Concrete hollow blocks chb, are one of the most extensively used walling materials in the. Load carrying capacity of hollow concrete block masonry column.
Concrete hollow blocks are innovative building products that are used as substitutes for traditional bricks in building construction. This research and compilation, highlights the use of different materials that are used for construction of structures ranging from housing complex, bridges and roads to skyscrapers and monuments. In this pamphlet block is used throughout, but the same principles apply to brick. Concrete blocks are manufactured in required shape and sizes and these may be solid or hollow blocks. A concrete block wall can be laid in less time and may cost up to half as much as a similar brick wall.
Results some physical experiment also detail checked to make sure that the samples are flawless to be suitable. Concrete block specification properties of concrete block. Concrete blocks may be produced with hollow centers cores to reduce weight or improve insulation. Pdf this paper presents the behavior of loadbearing masonry wallettes built up of hollow concrete blocks systems, loaded by axial compression until. The american concrete institutes aci publication 318, building code requirements for structural concrete, contains the structural property standards for concrete and 7day and 28day testing methods used to insure that the concrete blocks manufactured meet or exceed building codes throughout the. Many authors have perceived that different configurations of cavities inside hollow blocks can influence their thermal performed a numerical study on hollow clay. What standard sizes of hollow concrete block knowledge. Thermal transmittance evaluation of concrete hollow blocks. A hollow unit is that unit which has core void area greater than 25% of the gross area.
Concrete hollow blocks are machinemade and unaffected by weather conditions unlike the red bricks. Hollow blocks construction provides facilities for concealing electrical conduit. This item is already covered in unified sor 2010 item no. Hollow blocks are the most common type of concrete blocks, having one or more holes that are open at both sides. This project is a study of construction of hollow concrete block masonry. Many authors have perceived that different configurations of cavities inside hollow blocks can influence their thermal performed a numerical study on hollow clay bricks, varying the size and number of cavities, and. In this case, associated with the use of insulation. Lemass, minister for industry and commerce, in exercise of the power conferred on me by subsection 3 of section 20 of the industrial research and standards act, 1946 no. What standard sizes of hollow concrete block sep 22, 2017 hollow concrete block made from cement,aggregate,water, are able to be produced in required size and shape by block making machine, as concrete masonry unit for building material, the common size is 4 inch, 6 inch, 8 inch, 10 inch and 12inch unit configurations. Pdf the behaviour of hollow concrete block masonry under. Pdf brick masonry and hollow concrete block masonry a. The good concrete compacted by high pressure and vibration gives substantial strength to the block.
Get a large container, as large as you can get in your work area. How concrete block is made material, manufacture, used. It is either solid or hollow and formed from a mixture of cement, aggregate and water. The emphasis in the present study is given to study the crack patterns developed in the structural elements like columns constructed with hollow concrete blocks, and to the load carrying capacity of the hollow concrete block individually and when used in the masonry work. Besides different sizes and designs can be given to the blocks. Put the cement, sand, and gravel in the container at a ratio of 1. Types of concrete blocks or concrete masonry units in.
Solid blocks have no cavities, or according to us standards have no voids amounting to not more than 25% of the gross crosssectional area. Firstly cement, stone chips, sand, etc are mixed in the ratio of 1. Manufacturing process cement concrete blocks can be solid dense or hollow. Dense concrete blocks highly resilient, tough, loadbearing blocks suitable for any application. Table 3 shows the rvalues for a typical 8 cmu of various densities with and without insulated cores. Hollow concrete blocks hbc are blocks manufactured. Yes, we will be making the concrete hollow blocks ourselves. Bricks and blocks are masonry units and are referred to as such in sabs standards. However, the particle size of the coarse aggregate should not exceed one third thickness of the thinnest web of the hollow blocks. They are primarily used in locations that require construction using a reinforced concrete wall and in agricultural buildings. These bricks are made of fly ash, cement, lime, gypsum, stone dust etc.
You will require cement, sand, gravel, and water for making the concrete mix. Best designer is one who comes out with a design which gives the stable and economic structure. Moreover, falg also reduces the d ead weight and handling cost of materials in multistoried constructions. Compressive strength and absorption requirements of hollow concrete block iii. Which are usually rectangular and are used in construction of masonry structure. Most concrete blocks have one or more hollow cavities, and their sides may be cast smooth or with a design. It is important to have plenty or mortar along the bottom edges of the block for the first. Thermal resistance rvalues rvalues of concrete masonry are correlated to concrete density, since thermal conductivity of concrete increases with increasing density. The optimum usage of such building materials and their. Insulite medium density aggregate blocks the perfect. Ordinary portland cement is the cementing material. Concrete blocks are used extensively for both load bearing and non load bearing walls, externally and internally. Excessive water will reduce the strength of the concrete and its durability.
We offer unique range of light weight of hollow blocks, which are used inconstruction of houses in earthquacke prone areas. Feb 28, 2018 concrete hollow blocks are innovative building products that are used as substitutes for traditional bricks in building construction. Also, if its alright to ask for a little more help, ive been researching more on the coverage of our project for the past few hours, and i found a. At 75% utilisation of the capacity, productions of 600000 nos. The materials required for the production of the concrete blocks are aggregates, cement and water. Aerated concrete blocks exceptionally high performance blocks with the lowest thermal conductivity of any masonry block available in the uk. Start mixing water in the container and stir the mixture continuously with a rod. Pdf compressive strength and bulk density of concrete. The term precast refers to the fact that the blocks are formed and hardened before they are brought to the job site. Pdf experimental research of hollow concrete block masonry. How to make concrete blocks manufacturing cement bricks. The hollow concrete blocks found out due to different. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to.
Hollow concrete blocks is used as substitute for conventional bricks or stones used in construction of. The concrete hollow blocks are made out of mixture of cement, sand and stone chips. It reduces cement in masonry work and reduced the cost of construction. The blocks are available in a standard face size of 440 x 215mm and in thicknesses of 140mm and 215mm in a standard finish suitable for rendering. Concrete blocks are an affordable building material that can be used for many construction projects and are suited very well for construction walls for foundations or utility buildings. Snap a chalk line to mark the position of the blocks on the footing. Sep 01, 2015 the materials required for the production of the concrete blocks are aggregates, cement and water. Concrete blocks typically have holes in the center to reduce the weight, material needed, and cost. The difference between bricks and blocks is one of size. Lightweight blocks can also be produced using autoclaved aerated concrete. In order to promote public education and public safety, equal justice for all, a better informed citizenry, the rule of law, world trade and world peace, this legal document is hereby made available on a noncommercial basis, as it is the right of all humans to know and speak the laws that govern them. Pdf hollow block masonry materials for construction.
The aggregates are selected by considering the weight, texture or. The concrete blocks are generally made using concrete which is a mixture of powdered portland cement, water, msand, and gravel. Ordinary portland cement is the cementing material used in cement concrete hollow blocks. Concrete masonry blocks are generally made of cement, aggregate and water. Load carrying capacity of hollow concrete block masonry.
Bess is an organization of the beyazli group of companies. Low maintenance, color and brilliance of masonry withstands outdoor elements. This hollow concrete block have open or closed cavity and can be used in the construction of loadbearing and nonload bearing partition walls. Concrete blocks brochure 23rd march 2015 riba product selector. Cement concrete hollow blocks are usually of the following three dimensions. The units are made in a range of sizes, shapes, colours, textures and profiles and are. The use of blockwork allows structures to be built in the traditional masonry style with layers or courses of staggered blocks. A concrete block is one of several precast concrete products used in construction. Bess has started its international business in 2007 and developed in a short time because of the high quality machines it produces, reasonable price compared to the quality and efficient aftersales system. In this paper an investigation on hollow concrete block masonry is carried out. Compressive strength of concrete hollow blocks formula. Proper curing increase compressive strength of the blocks.
Economy and stability are the prime requisites of any structure. Bess manufactures concrete block machines, paving block machines and molds. Pdf the use of concrete masonry units for highrise load bearing construction has created a need for concrete block with high compressive strength. The aggregates of various types have been used with varying degree of success and they include crushed stones, gravel, volcanic cinders, foamed slag, furnace clinker, etc.
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