IS 2185 -1983 Code Book PDF free download

IS 2185 -1983 Code Book PDF free download

This Indian Standard ( Part II ) ( First Revision ) was adopted by the Indian Standards Institution on 28 February 1983, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council. This standard was first published in 1966 as ‘ IS : 35cO-1966 Specification for load bearing lightweight concrete blocks’. The first revision is being issued under the modified title ‘ Specification for concrete masonry units: Part II Hollow and solid lightweight concrete blocks’ and supercedes IS : 3590-1966. Part I of this standard covers hollow and solid concrete blocks of normal weight. This modification in title is intended for facilitating the co-ordination of requirements of various types of concrete masonry units, covered under various Indian Standards.  This standard incorporates significant modifications especially with regard to the classification of the blocks and physical requirements such as dimensions, compressive strength values, water absorption and drying shrinkage. Also this revision covers hollow blocks of close-’ cavity type apart from hollow blocks of open cavity. The requiremen.; of load bearing and non-load bearing blocks have been separately given in this standard to the extent possible.  Concrete masonry, already extensively used in building construction abroad, is likely to make very considerable headway in this country because of the many advantages, such as durability, strength and structural stability, fire resistance, insulatton, and sound absorption it possesses. Concrete masonry construction is also economical because of the following aspects: a) the units are relatively large and true in size and shape. This insures rapid construction so that more wall is laid per man-hour than in other types of wall construction; b) fewer joints result in a considerable saving in mortar as compared to hormal masonry construction; and c) the true plane surface obtained does not require plaster. Even when plaster is used for any reason, the quantity required for satisfactory coverage is significantly small.  Concrete masonry has an attractive appearance and is readily adaptable to any style of architecture. It lends itself to a wide variety of surface finishes for both exterior and interior walls. It may also be finished with cement plaster, gauged with lime or a plasticizer. Concrete masonry units provide a strong mechanical key, uniting the concrete masonry backing and the plaster finish in a strong permanent bond.  Concrete masonry units are used for both load-bearing and non-load bearing walls, for partitions and panel walls, as backing for other types of facing material, for piers; pilasters and columns, for retaining walls, garden walls, chimneys and fire places, as fillers in concrete joist floor construction, and as shuttering for beams and lintels.  Concrete masonry units manufactured from lightweight aggregate concrete are used for both load bearing and non-load bearing internal wails, partition and panel walls, inner leaf of cavity walls or as backing to brick masonry and for external load bearing walls as well as panel walls in steel or reinforced concrete frame construction when protected from weather hy rendering or by some other efficient treatment.  For the purpose of. deciding whether + particular requirement of this standard is complied with, the final value, observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance with IS : 2-1960+. The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

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