Assessment of properties of sandcrete blocks produced by. Among the objectives of this nis document are to ensure. Sandcrete blocks comprise of natural sand, water and binder. So many are using wooden moulds or metal moulds and compaction is done manually with hand. Quality assessment of hollow sandcrete blocks in the south. Depending in the project, sandcrete blocks have became obvious useful in different types of civil engineering work in the past and recent times all sandcrete bricks have similar uses, their properties differ in some respect depending on the materials used and method of manufacture to understand these properties. Also uniaxial compressive strength of hollow sandcrete blocks is defined on the basis of the apparent. According to anosike and oyebade, 2012, two types of sandcrete blocks are specified by nis, type a load bearing blocks, and type b nonload bearing blocks. Abstract 100mm and 125mm solid blocks are extensively used for building construction at idiroko area of ogun state in nigeria and environ with no record of known available data. Other types of sandcrete blocks are decorative and ventilating blocks which are sandcrete blocks without.
In the contrary, solid sandcrete block does not have any void. Now, if you want to build a concrete block or concrete masonry unit you need to have an understanding about checklist to compliance to the approved project documents such as blockwork shop drawing, method statement for blockwork, and inspection and test plan so, if you want to know more about concrete block or concrete masonry units here are the most common type of concrete blocks used in. Hollow sandcrete blocks are the common types of sandcrete blocks. The effectiveness and obstructs of sandcrete and concrete block in a foundation system abstract it is a clear fact that bricks play a vital role in a foundation system of a building. Calcium silicate blocks shall comply with bs en 771. Concrete block masonry which is also known as concrete masonry unit cmu have advantages over brick and stone masonry. Concrete blocks advantageous properties are reflected in their myriad of variations of strength, insulating and soundreducing properties. Cement concrete hollow blocks are usually of the following three dimensions.
Approved sizes for sandcrete blocks specified by nis are presented in table 1. Although hollow blocks of all the three sizes could be made using the same machinery. Establishing the compressive strength of sandcrete blocks produced in the central region, ghana. This study used fine aggregates and 54 sandcrete blocks approved types and sizes for sandcrete blocks specified by comprising 225 mm and 150 mm which. The nis specified two types of blocks, types a load bearing and type b non load bearing and these blocks can also be solid or hollow. The term precast refers to the fact that the blocks are formed and hardened before they are brought to the job site. Effect of sugarcane bagasse ash on the engineering properties. Sandcrete is a yellowwhite building material made from a binder typically portland cement, sand in a ratio of circa 1. Concrete blocks and pavers mix design and manufacturing. Types the standard concrete block is often divided into two. The total void area can amount to 50% of the gross crosssectional area. Hydraform block, usually solid, is a type of sandcrete block that could be. In many parts of nigeria, sandcrete block is the major cost component of the most common buildings.
And when moulding, use one bag of cement for 30 blocks. Costs of alternative methods of acquiring sandcrete blocks. Hollow blocks are the most common type of concrete blocks, having one or more holes that are open at both sides. The study concludes that interlocking masonry is a good replacement to the conventional types in construction of housing in nigeria. A study on the durability of solid sandcrete blocks samuel sunday omopariola department of works and services, the federal polytechnic, ilaro, nigeria. The use of mud blocks is now fast disappearing and giving way to the use of masonry units especially sandcrete blocks. This makes sandcrete blocks a very important material in building construction. The sand and cement mixture is in the proportion of 6. This has necessitated producers of sandcrete blocks to produce blocks with low opc content that will be affordable to people and with much gain. Mar 03, 2015 sandcrete blocks are widely used in nigeria as walling units and over 90% of houses in nigeria are being constructed of sandcrete blocks. Get tips from sakretes technical team to make sure every job is professional grade.
Compressive strength of manual and machine compacted sandcrete. Specifications for moulding sandcrete blocks stipulates that the block is generally to be made in accordance with bs 2028. Sometimes other ingredients may be added to reduce the amount of expensive portland cement such as pozzolanas and rice husk ash. Sandcrete blocks are widely used as walling units in nigeria. Comparative study of cement stabilized clay brick and. The properties of sandcrete block depends to a varying degree on the type and. Optimum compressive strength of hardened sandcrete. Okhuahie, ovia, ikpoba flood and okhoro erosion sands were collected for the study. Concrete blocks are manufactured in required shape and sizes and these may be solid or hollow blocks. The nis specified two types of blocks, types a load bearing and type b nonload bearing and these blocks can also be solid or hollow.
Compressive strength of sandcrete blocks in bosso and shiroro. The study recommends a reduction in the cementsand and cementclay mix. Hollow sandcrete blocks containing a mixture of sand, cement and water are used extensively in many countries of the world especially in africa according to oyekan and kamiyo 2011. Production process and necessary tests performed on both raw materials and sandcrete blocks are discussed in the following sections. The effects of production methods on the compressive strength. Sandcrete blocks are largely used for load bearing and nonload bearing walls and foundations. Types of concrete blocks or concrete masonry units in.
This paper investigates the strength characteristics of sandcrete blocks in yola 8 0 3647 n 12 0 1914 e metropolis. The strength of sandcrete blocks depend upon two major factors, namely. Sandcrete blocks and quality management in nigeria building. The hollow blocks have a void that is approximately a third of the volume of the blocks. The purpose of this study is to see if varying the vibration time and sand type during moulding of blocks would affect the strength of the blocks. In use from the 1940s onwards, dense aggregate blocks are very much the workhorse of the construction industry. How concrete block is made material, manufacture, used. A concrete block is one of several precast concrete products used in construction. Also uniaxial compressive strength of hollow sandcrete blocks is defined on the basis of the apparent area of the ascast face. The influence of vibration time and sand type on the. May 29, 2017 sandcrete manufacture could be for solid blocks, hollow blocks. Types of concrete blocks characteristics of different types.
Pdf sandcrete blocks and quality management in nigeria. Strength properties of commercially produces sandcrete blocks. Special shaped blocks, required to form proper bonding, which cannot be made in a standard blockmaking machine may be made in approved wooden moulds. Sandcrete block manufacturing and testing the constructor. Jul 02, 2018 concrete blocks in general, are also known as concrete units for masonry concrete masonry units or cmu in english or masonry blocks. The results showed that the 28day compressive strengths of sandcrete blocks produced in calabar block industry range between 0. From new construction to repair of concrete, asphalt or mortar, sakrete has the products you need to get the job done. Pdf compressive strength of sandcrete blocks orjinta. The definition has made no distinction between hollow and solid sandcrete blocks. Pdf establishing the compressive strength of sandcrete. Solid blocks have no cavities, or according to us standards have no voids amounting to not more than 25% of the gross crosssectional area. Full length research paper a study of the preference level.
A concrete block is primarily used as a building material in the construction of walls. Effect of sugarcane bagasse ash on the engineering. Sandcrete blocks and quality management in nigeria. Nowadays there are a lot of sandcrete and concrete block industries all over the place. Introduction sandcrete blocks are products of fine aggregate, portland cement and water in a prescribed mix ratio proportions.
Masonry studies in various parts of nigeria revealed that the majority of blocks do not meet the. Compressive strength of manual and machine compacted. Pdf assessment of sandcrete blocks manufacturers compliance. Concrete blocks technical data short description concrete block construction has gained importance and has become a valid alternative to fired clay bricks. Sandcrete blocks, compressive strength, aggregates, sieve analysis, grading, curing, materials. The load carrying capacity of hollow sandcrete blocks. Part 2 and shall have a minimum compressive strength of 5 nmm2 unless otherwise stated. Sandcrete blocks and bricks are masonry units manufactured from a mixture of cement, sand and water, and it plays a crucial role in the building construction. Concrete blocks are produced in a large variety of shapes and sizes. Sandcrete blocks have been manufactured manually and mechanically to meet the need of building due to the discovery of cement. The poverty level amongst west african countries and particularly nigerian has made these blocks. The essential ingredients of concrete are cement, aggregate sand, gravel and water. If you want to build a residential or commercial house, you had better mould your own blocks rather than buy from moulders. And also that the strongness and weakness of a building depends solidly on the methods employed in moulding the bricks which are used in laying the foundation of a building.
Compression tests on hollow sandcrete blocks are conventionally confined to the ascast face neglecting the other two orthogonal faces. Pdf sandcrete blocks comprise of natural sand, water and binder. A wide variety of sandcrete block making machine options are available to you, such as type, processing, and brick raw material. The aggregates used for moulding the blocks were also collected and their particle sizes analysed. Sandcrete is similar but weaker than mortar, for which the ratio is circa 1. 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. They are usually 450mm x 225mm x 225mm for load bearing walls and 450mm x 150mm x 225mm for nonload bearing walls. Keywordssandcrete blocks, compressive strength, aggregates, curing. Sandcrete blocks possess an intrinsic low compressive strength making them susceptible to any tragedy such as seismic activity. Types of brick used in construction the balance small business. Blocks are those building unit used in the construction of walls and partitions.
Proper curing and suitable selection of constituent materials was suggested to improve on the quality of sandcrete blocks. Skip the pencil and paper use our calculators to make quick work of estimating. Thus, what is principally being examined in this paper is the impact of vibration time on the compressive strength of sandcrete blocks. Sandcrete blocks are masonry units made use of in all types of masonry constructions such as exterior and interior load bearing walls, fire walls, party walls, curtain walls, panel walls, partition, backings for other masonry, facing materials, fire proofing over structured. Sandcrete block is a composite material made up of cement, sand, water, molded into different sizes 1. Sandcrete blocks can be made either in solid and hollow rectangular types. Impact of vibration time on compressive strength of hardened.
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