It increases the carpet area of the building because of small width of concrete block as compared to the brick masonry wall. Structurally efficient hollow concrete blocks in load bearing masonry. Pdf the behaviour of hollow concrete block masonry under. Concrete blocks in general, are also known as concrete units for. Mixture to make concrete hollow blocks stronger answers. Arcli uses the sizes 14,5 x 29 x 14cm, 14,5 x 14,5 x 14cm width x length x height solid blocks have no cavities, or according to us standards have no voids amounting to not more than 25% of the gross crosssectional area. They may be used for both load bearing as well as non load bearing walls.
The plastic bottles were used to create voids at equal distance between them in the masonry units. Can be used for the construction of high strength retaining walls, for external walls, cavity. The concrete commonly used to make concrete blocks is. Types of concrete blocks or concrete masonry units used in construction concrete block masonry which is also known as concrete masonry unit cmu have advantages over brick and stone masonry. Concrete hollow blocks are machinemade and unaffected by weather conditions unlike the red bricks. Page 1 of 4 hollow concrete blocks description of item. Types of concrete blocks characteristics of different types. 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. Cmus are some of the most versatile building products available because of the wide variety of appearances that can be achieved using concrete masonry units. Use of recycled plastic water bottles in concrete blocks. A concrete block is one of several precast concrete products used in construction. Each pour should be limited to 1m depth, and fall of the concrete.
This hollow concrete block have open or closed cavity and can be used in the construction of. Hollow blocks are the most commonly used masonry unit. The required finish must also be much better than that of solid blocks. These hollow cores, which come in sets of either two or three, take up approximately 50 percent of the block s total volume. Properties of the material used must be better understood first. Hollow concrete block have become a regular or frequent choice today in construction activities as these blocks offer various benefits, simplicities in their use as building elements, strength comparable with the conventional blocks like bricks, facilities to get reinforced thereby increasing the. Hollow blocks are the most common type of concrete. Sep 20, 2019 concrete blocks are an essential part of construction project. Advantages of using concrete hollow blocks an innovation. An investigation on construction of hollow concrete block masonry. Aerated autoclaved concrete block aac most of the time compared with bricks but is different in a.
Types of concrete blocks or concrete masonry units in. Concrete blocks are manufactured in required shape and sizes and these may be solid or hollow blocks. Proper curing increase compressive strength of the blocks. Hollow blocks are manufactured from high quality class 2. It is laid with its length parallel to the face of the wall. Hollow concrete blocks are lighter than plain concrete blocks easier to transport and to install and provide better thermal insulation. Bricks and blocks are masonry units and are referred to as such in sabs standards. They are manufactured to bs en 77 using class 1 limestone aggregates. Ideas from cement fountains, flower pots, small fish ponds, all in one idea. Pdf the behaviour of hollow concrete block masonry under axial.
The research aims to identify the compressive strength and use an efficient method for. A hollow concrete block is primarily used as a building material in the. It may be noted that for hollow concrete blocks the quality of material required must be much finer compared to solid concrete blocks, hence it is advisable to use more fly ash for proper blending of fines gradation. They can also be designed to receive reinforcement and concrete. A concrete masonry unit cmu is a standard size rectangular block used in building construction. Jul 02, 2018 the concrete block may have a solid or hollow core. Concrete hollow block can be produced by concrete block making machine, the product is mainly used to fill the highlevel framework of the building, because of its lightweight, sound insulation, good thermal. Advantages of using concrete hollow blocks an innovation in building products posted on feb 28, 2018 category real estate industry by tasnia tajin 14 comments concrete hollow blocks are innovative building products that are used. Others who live in concrete homes choose the more expensive option of having the concrete blocks covered in a special stucco material to enhance its appearance.
Dec 18, 2017 hollow concrete blocks are lighter than plain concrete blocks easier to transport and to install and provide better thermal insulation. When a reinforced wall is wanted, hollow blocks may be used, reinforcing bar fitted, concrete poured into the wall, and the poured mix poker vibrated to release air pockets. Lower density blocks may use industrial wastes, such as fly ash or bottom ash. Use of recycled plastic water bottles in concrete blocks sina safinia, amani alkalbani middle east college, kom, rusayl, muscat pc 124, oman abstract the purpose of this study is to examine the possibility of using plastic bottles in concrete block. The first hollow concrete block was designed in 1890 by harmon s. The smallscale manufacture of concrete bricks and blocks for masonry is well suited to small businesses. The load bearing blocks made from concrete offer more compressive strength than standard landscaping concrete blocks which are used for features or pavements. These guys worked tirelessly from early morning to late in the day. Hollow concrete blocks have one or more hollow cores. Concrete blocks and pavers mix design and manufacturing.
Can be used for the construction of high strength retaining walls. What is the advantage of hollow concrete blocks compared. Hollow dense concrete blocks manufactured to bs en 77 available in standard texture hollow dense blocks are perfect for agricultural and commercial applications. Portland cement and aggregate, usually sand and fine gravel, for highdensity blocks. Manufactured aggregate materials included expanded shale, clay and slate. 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. Formablok introduces a revolutionary reusable easytouse landscape block mold.
Concrete hollow blocks for use in masonry have been produced in a large variety of shapes and sizes. They may be used for both load bearing as well as non load. Concrete masonry hollow blocks are manufactured with 2150 kgm3 concrete density for normal weight blocks and 1100 kgm3 concrete density for lightweight concrete blocks. Hollow concrete blocksa new trend internet archive. The concrete block is a construction material composed of portland cement, sand, water and other additives that are used to replace concrete cast in the construction of walls, shoes and. Aerated concrete blocks exceptionally high performance blocks with the lowest thermal conductivity of any masonry block available in the uk. The study reported in this paper is a development of crumb rubber hollow concrete block crhcb. Commonly used in the construction industry, concrete hollow blocks are usually manufactured using lightweight. How concrete block is made material, manufacture, used. The behaviour of hollow concrete block masonry under axial compression article pdf available december 2014 with 1,435 reads how we measure reads. An investigation on construction of hollow concrete block masonry emphasizing in the present to study the crack patterns developed in the structural elements such as wall. Concrete block specification properties of concrete block. Pdf properties of concrete block containing rice husk ash. Mar 31, 2019 the concrete block is designed so that when the wall or edifice is installed, rebar can be placed within the core of the cinder block to reinforce the structure.
Uses of concrete blocks in view of the advantages mentioned above, the concrete block masonry technique of construction can be adopted on a large scale of mass housing and various civil engineering projects. Types of concrete blocks characteristics of different. The purpose of this study is to examine the possibility of using plastic bottles in concrete block. Hollow blocks are often used to build large structures like boundary fences. Waylite is another example introduced in the late 1930s. With our 4 design types, you can now make your own articulating interlocking dry stack gravity blocks to create any configuration imaginable. This hollow concrete block have open or closed cavity and can be used in the construction of loadbearing and nonload bearing partition walls. Production can be carried out in the open, the process is simple and equipment. Part 1 hollow and solid concrete blocks third revision 1 scope this standard part 1 covers the following concrete masonry building units which are used in the construction ofloadbearing and partition walls. Concrete masonry blocks solid, hollow, thermal, hourdi. Most of the construction industry nowadays use concrete blocks in order to enhance and improve the performance of the building structure. Stretcher a stretcher block is the most commonly used block in construction. Dense concrete blocks highly resilient, tough, loadbearing blocks suitable for any application. Where hollow block work is specified for work above dampproof course level, the blocks.
Advantages of using concrete hollow blocks an innovation in. For the purpose of this work, sixtyfour trial mixes were prepared to produce hollow concrete blocks of. These cores reduce the total crosssectional area of the block by at least 25 percent. A hollow unit is that unit which has core void area greater than 25% of the gross area. Ahmad et al, 2014 hollow concrete blocks may be used.
The latter has cavities that reduce weight, but also offer less resistance. The concrete blocks also known as cement brick or hollow cement brick or cement stock brick. Concrete hollow blocks and test samples were moulded with plastic consistency concrete, to assure the same material in all cases, in three different levels of strength nominally 10 nmm. How to make concrete blocks manufacturing cement bricks. Uses of concrete blocks in view of the advantages mentioned above, the concrete block masonry technique of construction can be adopted on a large scale of mass housing and various civil. Low maintenance, color and brilliance of masonry withstands outdoor elements. Insulite medium density aggregate blocks the perfect. A concrete masonry unit cmu or a hollow concrete block is a standard sized rectangular hollow block made of cast concrete e. However, the particle size of the coarse aggregate should not exceed one third thickness of the thinnest web of the hollow blocks. Concrete block manufacturers now produce concrete blocks in a wide range of colors, textures and finishes that architects utilize to great effect, depending on the building design. Feb 28, 2018 concrete hollow blocks are innovative building products that are used as substitutes for traditional bricks in building construction. The raw materials of concrete hollow block premier supplier. Concrete blocks are produced in a large variety of shapes and sizes.
What is the advantage of hollow concrete blocks compared with. Arcli uses the sizes 14,5 x 29 x 14cm, 14,5 x 14,5 x 14cm. The use of concrete blocks as a masonry unit can be observed on many construction sites because of the following advantages. Within the limits of codal requirements, it is possible to. The ultimate guide introduction of different raw materials raw material ratio of concrete blocks formula of nonburning and steamfree concrete blocks formula of autoclaved fly ash brick let us now go into details to learn what is raw materials for concrete blocks, choose your suitable ration of concrete. Haydite is one example of an expanded shale product used in the early 1920s in the manufacture of blocks. These are the concrete blocks either hollow or solid. The aesthetic properties of concrete blocks, once utilitarian and gray, have become more important. They have an inner void area which is greater than 25% of their gross area and are available in various sizes and shapes. Strong, reinforced walls can be easily constructed quickly and economically.
Concrete blocks used in the construction of building are actually made onsite. The good concrete compacted by high pressure and vibration gives substantial strength to the block. The raw materials of concrete hollow block premier. Disadvantages of concrete blocks in building houses hunker. In order to study the effect of moisture on the compressive strength of lowstrength hollow concrete blocks, an experimental study was carried out on 96 samples of locally manufactured hollow. They can also be designed to receive reinforcement and concrete as lintels or stiffeners without any addition. Typical uses typical historical uses for concrete block include. Concrete blocks are used extensively for both load bearing and non load bearing walls, externally and internally. Most concrete blocks have one or more hollow cavities, and their sides may be cast smooth or with a design. Pdf hollow block masonry materials for construction. Aug 11, 2012 other types of concrete hollow blocks concrete hollow blocks capuno, azaleah p. Types of concrete blocks or concrete masonry units used in. Hollow manufactured to bs en 77 available in standard texture.
The reduced volume of concrete used to make each block adds up to a significant savings in cost for the materials. Ordinary portland cement is the cementing material used in cement concrete hollow blocks. Hollow concrete block is a significant kind of masonry units existing for the builders and its application for masonry construction is increasing continuously. They can be produced manually or with the help of machines. Lower density blocks may use industrial wastes, such as fly ash or bottom ash, as an aggregate and are often called as cinderblocks breeze blocks in different. Hollow concrete block is an important addition to the types of masonry units available to the builder and its use for masonry is a constantly increases. Concrete blocks containing rice husk ash should be promoted as a new construction material to replace the existing blocks in market. Hollow blocks are the most common type of concrete blocks, having one or more holes that are open at both sides. The term precast refers to the fact that the blocks are formed and hardened before they are brought to the job site.
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