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Indian standard code 456 pdf

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IS pdf - Download as PDF File .pdf), Text File .txt) or read online. PLAIN AND REINFORCED CONCRETE CODE OF PRACTICE This Indian Standard ( Fourth Revision) was adopted by the Bureau of Indian Standards, after the draft. Download IS PDF for Civil Engineering. This Indian Standard (Fourth Revision) was adopted by the Bureau of Indian Standards after the draft finalized by. PLAIN AND REINFORCED CONCRETE -CODE OF PRACTICE. (Fourth Revision ) IS GENERAL CONSTRUCTION IN STEEL.

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and whereas the attached publication of the Bureau of Indian Standards is of particular interest IS (): Plain and Reinforced Concrete - Code of. India Standard Code Pdf Download. IS Plain and Reinforced Concrete - Code of Practice is an Indian Standard code of. IS Indian Standard. PLAIN AND REINFORCED CONCRETE -. CODE OF PRACTICE. (Fourth Revision). ICS 0 BIS BUREAU.

Adequate curing is Where freezing and thawing actions under wet essential to avoid the harmful effects of early loss of conditions exist, enhanced durability can be obtained moisture see 13S. The remainder of the cone or pyramid araund the concentrated load; reinforcement shall be-uniformly distributed in in this case, the footing shall be designed for the outer portions of the footing. Such documentation should generally include: If The standard deviation for each grade of concrete shall design mix concrete cannot be used for any reason on be calculated, separately. The deflection shall generally be limited to the following:

Hibbeler Book April Punmia, Ashok Kumar Jain, Arun April 8. April 7. Popular Files. January June 2. February 6. June Trending on EasyEngineering. June 7. December February Never Miss. Load more. Sponsored By. With this revision acceptance criteria has been simplified in line with the provisions given in BS Part Part 4 Specification for the procedures to be used in sampling, testing and assessing compliance of concrete. Tweet Share Share Share Share.

About Admin. Click here for comments. Unknown admin. Thanks for your comment. Part 1: For the purpose of deciding whether a 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: SW 72 Eccentricity 1.

At the time of K - Stiffness of member publication, the editions indicated were valid. All k - Constant or coefficient or factor standards are subject to revision and parties to Ld - Development length agreements abased on this standard are encouraged to LL- Live load or imposed load investigate the possibility of applying the most recent editions of the standards indicated in Annex A.

Consumers are, therefore, advised to go by The cement used shall be any of the following and the the characteristics as given in the corresponding type selected should be appropriate for the intended Indian Standard Specification or seek specialist use: IS shall be used with adequate precautions with NOTE--Rice husk ash is produced by burning rice husk and regard to removal of formwork, etc.

To achieve amorphousstate, 5. It is necessary to evaluatethe productfrom a ptuticularsource for performnnce supersulphated cement conforming to IS may be and uniformitysince it can range from being as dekterious as used only under special circumstances with the prior silt when incorporatedin concmte. Waterdemnnd and drying approval of the engineer-in-charge. Metakaoline having fineness between to 5. Specification for thatcement. Any trade-mark or any The resultingmaterialhas high pozzolanicity.

As a guide the following IS As far as possible preference shall be given to concentrations represent the maximum permissible natural aggregates. The be as large as possible within the limits specified but sample shall not receive any treatment before testing in no case greater than one-fourth of the minimum other than that envisaged in the regular supply of water thickness of the member, provided that the concrete proposed for use in concrete.

The sample shall be stored can be placed without difficulty so as to surround all in a clean container previously rinsed out with similar reinforcement thoroughly and fill the comers of the water.

[PDF] IS - CODE Book Free Download – EasyEngineering

For most work, 20 mm aggregate is suitable. The cubes shall given to the use of 10 mm nominal maximum size. The test blocks shall be preparedand tested in in the case of ribs of main beams, the nominal accordance with the requirements off S 1 Part 5.

Mixing or curing of concrete with sea water is not 5. All-in-aggregate may be used only where sea water. Under unavoidable circumstances sea water specifically permitted by the engineer-in-charge. Wids claust? However, water used for scales, loose rust and coats of paints, oil, mud or any curing should not produce any objectionable stain or other substances which may destroy or reduce bond. The presence Sand blasting or other treatment is recommended to of tannic acid or iron compounds is objectionable.

Previous experience with and data on such materials Specialist literature may be referred to in such cases. The characteristic yield strength of Table 2. Table-5 may be used for plain concrete constructions, 5. There is normally a gain of strength beyond 28 days. The design should be based on 28 days charac- IS Ordinary M 10 10 Concrete M 15 6.

IS 456.pdf

For a given humidity and M 35 35 temperature, the total shrinkage of concrete is most M40 40 M 45 45 influenced by the total amount of water present in the M JO 50 concrete at the time of mixing and, to a lesser extent, M 55 55 by the cement content. High M60 60 6. When the designer wishes to use an does not include the elastic strain.

The modulus of elasticity is primarily influenced by npe of Aggregate Coeficient of Thermal the elastic properties of the aggregate and to a lesser Expansion for CommtePC extent by the conditions of curing qd age of the Quartzite 1. The modulus of elasticity is normally related to the Sandstone 0.

Granite 0. Suggested such that the concrete is of adequate workability for ranges of workability of concrete measured in the placing conditions of the concrete and can properly accordance with IS are given below: The diameter of tbe needle shall be determined based on the density and spacing of reinforcement bars and thickness of sections.

The materials and mix proportions specified and used should be such as f the shape and size of the member. The of water, oxygen, carbon dioxide, chloride, sulphate and concrete mix to provide adequate durability under these other potentially deleterious substances. Impermeability conditions should be chosen taking account of the is governed by the constituents and workmanship used accuracy of current testing regimes for control and in making the concrete. Adequate curing is Where freezing and thawing actions under wet essential to avoid the harmful effects of early loss of conditions exist, enhanced durability can be obtained moisture see 13S.

Member profiles and their by the use of suitable air entraining admixtures. When intersections with other members shall be designed and concrete lower than grade M 50 is used under these detailed in a way to ensure easy flow of concrete and conditions, the mean total air content by volume of proper compaction during concreting.

Concrete is more vulnerable to deterioration due to chemical or climatic attack when it is in thin sections, Nominal Maximum Size Entrained Air in sections under hydrostatic pressure from one side Aggregate Percentage only, in partially immersed sections and at corners and edges of elements. The life of the strycture can be WW lengthened by providing extra cover to steel, by 20 5fl chamfering the corners or by using circular cross- 40 4fl sections or by using surface coatings which prevent or reduce the ingress of water, carbon dioxide or Since air entrainment reduces the strength, suitable aggressive chemicals.

Chwes 8.

Environment Exposure Conditions or polychloroprene sheet; or surface coating based on 1 2 3 asphalt, chlorinated rubber, epoxy; or polyurethane i Mild Concrete surfaces protected against materials should also be used to prevent access by the weatheror aggressiveconditions,except those situatedin coastal area.

For other sizes of aggregate solid aggressive chemicals they should be changed as given in Table 6. For SO, contents near tbe upper limit of any class, cement contents above these minimum are advised. Alternatively, Portland slag cement conforming to IS having more than 50 percent slag or a blend of ordinary Portland cement and slag may be used provided sufficient information is available on performance of such blended cements in these conditions.

To prevent this, the total water-soluble sulphate content of the concrete 8. The sulphate content and materials is necessary, so that deleterious should be calculated as the total from the various constituents do not exceed the limits.

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The 4 percent limit does not apply to concrete made 8. Whenever there is chloride in concrete there is an 8. To minimize the chances of cracking and disruption of concrete. Damage to deterioration of concrete from harmful chemical salts, concrete from this reaction will normally only occur the levels of such harmful salts in concrete coming when.

The total amount of source of alkali; chloride content as Cl in the concrete at the time of placing shall be as given in Table 7.

Wherever aggregate combination are well established, and do not - possible, the total chloride content of the concrete include any instances of cracking due to alkali- should be determined. When the materials are unfamiliar, 8.

The additions such as fly ash or ground granulated blast furnace slag may be taken into account in the concrete composition with respect to Ihe cement content and water-cement ratio if the suitability is established and as long as the maximum amounts taken into account do not exceed the limit of pozzolona and slag specified in IS Part I and IS respectively.

Clause 8. Sl Nominal Maximum No. Aggregate Size Contents in Table 5 8. Additional protection may be obtained by the use of Tabie 7 Limits of Chloride Content of Concrete chemically resistant stone facing or a layer of plaster Clause 8. Acid Soluble 8. Full compaction is steam cured nt elevated tempe- particularly important in the vicinity of construction rntureand pre-stressedconcrete ii Reinforced conctite or plain concrete 0.

Further advantage can be obtained by use of fly It is essential to use proper and adequate curing ash Grade 1 conforming to IS or techniques to reduce the permeability of the concrete granulated blastfurnace slag conforming to and enhance its durability by extending the hydration IS as part replacement of ordinary of the cement, particularly in its surface zone Portland cement having total alkali content as see Na,O equivalent not more than 0.

Concrete in sea-water or exposed directly along the c Measures to reduce the degree of saturation of sea-coast shall be at least M 20 Grade in the case of the concrete during service such as use of plain concrete and M 30 in case of reinforced concrete. For more guidance specialist of the mix to obtain the densest possible concrete; slag, literatures may be referred. The mix proportions shall be selected to ensure the 9.

The target mean strength of concrete 9. If The standard deviation for each grade of concrete shall design mix concrete cannot be used for any reason on be calculated, separately. Attempts should be made to obtain the 30 samples, as early as possible, when a mix is used 4 Type of mix, that is, design mix concrete or nominal mix concrete; for the first time. As soon as the results of 9. Quality assurance in M 10 3. M45 The job of quality control and quality assurance Nominal mix concrete may be used for concrete of would involve quality audit of both the inputs as well M 20 or lower.

The proportions of materials for as the outputs. Inputs are in the form of materials for nominal mix concrete shall be in accordance with concrete; workmanship in all stages of batching, Table 9. Gradedcoarse aggregateshall be used. Exumple For an average grading of tine aggregate that is. Assurance Plan, for its participation in the project.

The individual Quality Assurance possible concrete. All ingredients of the concrete Plans shall fit into the general Quality Assurance Plan. A Quality Assurance Plan shall define the tasks and Allowance for building process and its results. Such documentation bulking shall be made in accordance with IS should generally include: Part 3.

NOTE-Quality control charts are recommended wherever the The amount-of the added water shall be adjusted to concrete is in continuous production over considerable period.

Standard pdf 456 indian code

For the determination of moisture content To avoid confusion and error in batching, consideration To allow for the variation in mass of aggregate due to should be given to using the smallest practical number variation in their moisture content, suitable adjustments of different concrete mixes on any site or in any one in the masses of aggregates shall also be made.

In the plant. In batching concrete, the quantity of both cement absence of -exact data, only in the case of nominal and aggregate shall be determined by mass; admixture, mixes, the amount of surface water may be estimated if solid, by mass; liquid admixture may however be from the values given in Table Water concrete plant shall be preferred.

For large and medium F. The material should additional tests to show that the quality and strength be stock-piled for several hours preferably a day before of concrete are satisfactory. The grading of coarse and fine aggregate should be checked as frequently as possible, the frequency The charge to ensure that the specified grading is mixer should comply with IS 1 and IS 12 The maintained.

If there is For other types of more efficient mixers, of formwork. The strength referred to shall be that of manufacturers recommendations shall be followed; concrete using the same cement and aggregates and for hydrophobic cement it may be decided by the admixture, if any, with the same proportions and cured engineer-in-charge.

Oand 2. For further details immediately after removal regarding design, detailing, etc. These tolerances apply to concrete dimensions only, and Release agents should be The forms without coating the reinforcement. Care shall Reinforcement placing should Within the concrete mass, different types of metal in contact Rough handling, shock loading prior to embedment should be avoided to ensure that bimetal corrosion does and the dropping of reinforcement from a height should not take place.

Reinforcement should be secured against displacement outside the specified limits. After mixing, concrete shall be transported to the formwork as rapidly as possible by methods which will a for effective depth 2oO. Spacers in its final position to avoid rehandling. The concrete between the links or the bars where no links exist shall be placed and compacted before initial setting of and the formwork should be of the same nominal size concrete commences and should not be subsequently as the nominal cover.

Methods of placing should be such as Spacers, chairs and other supports detailed on to preclude segregaion. Care should be taken to drawings, together with such other supports as avoid displacement of reinforcement or movement may be necessary, should be used to maintain the of formwork. As a general guidance, the maxi- specified nominal cover to the steel reinforcement. Over vibration and under vibration of connections, tests shall be made to prove that the joints concrete are harmful and should be avoided.

Vibration are of the full strength of bars connected. Welding of of very wet mixes should also be avoided. The it is desirable to avoid them. If this is not possible, period of curing shall not be less than 10 days for their number shall be minimized. Concreting shall be concrete exposed to dry and hot weather conditions. Construction joints should above minimumperiods may be extended to 14 days. Such compounds shall be applied to all exposed uneven surface.

It is recommended to clean out laitance surfaces of the concrete as soon as possible after the and cement slurry by using wire brush on the surface concrete has set. The surface may also be used to provide effective barrier prepared surface should be in a clean saturated surface against evaporation. It is exceedingly difficult and costly to alter concrete Fresh concrete should be thoroughly vibrated near once placed.

Hence, constant and strict supervision of construction joints so that mortar from the new concrete all the items of the construction is necessary during flows between large aggregates and develop proper the progress of the work, including the proportioning bond with old concrete. Supervision is also of extreme importance to check the reinforcement and Where high shear resistance is required at the its placing before being covered.

Sprayed curing membranes and release agents should The prevention of moisture loss from the concrete is particularly important if the-water- Part 1 or IS Part 2. The curing regime should also prevent the development of high temperature gradients within the concrete.

The water-cement ratio shall not Exposed surfaces of concrete shall be kept exceed 0. If the charge in the tremie is lost while the space into which concrete is to be deposited.

Otherwise it may be leached and of the tremie method, the vertical end piece of become segregated. Concrete shall be deposited, the pipe line is always inserted sufficiently deep continuously until it is brought to the required height. The bottom doors water shall be one of the following: The bucket shall be filled completely and pipes the lower end of which is always inserted lowered slowly to avoid backwash. The on the surface upon which the concrete is to be concrete emerging from the pipe pushes the deposited and when discharged, shall be material that has already been placed to the side withdrawn slowly until well above the concrete.

They shall be placed carefully in header batch of the mix or the entire contents the and stretcher courses so that the whole mass is. The tremie pipe shall interlocked. Bags used for this purpose shall be be not less than mm in diameter and shall free from deleterious materials.

A separate and also to the faces of the concrete shall not lifting device shall be provided for each tremie exceed one metre. Stone aggregate of not less pipe with its hopper at the upper end. Unless than 50 mm nor more than mm size shall be the lower end of the pipe is equipped with an deposited outside the steel cages over the full approved automatic check valve, the upper end area and height to be concreted with due care to of the pipe shall be plugged with a wadding of prevent displacement of the cages.

As the grouting proceeds, the concrete.

Pdf 456 standard indian code

It will be necessary to raise slowly the pipe shall be raised gradually up to a height of tremie in order to cause a uniform flow of the not more than 6 mm above its starting level concrete, but the tremie shall not be emptied so after which it may be withdrawn and placed into that water enters the pipe.

At all times after the the next cage for further grouting by the same placing of concrete is started and until all the procedure. Additional samples may be The amount of grout to be sent down shall be required for various purposes such as to determine the sufficient to fill all the voids which may be either strength of concrete at 7 days or at the time of striking ascertained or assumed as 55 percent of the the formwork, or to determine the duration of curing, volume to be concreted.

Additional samples may also be required for testing samples cured by The care shall be exercised not to disturb the concrete as specimen shall be tested as described in IS The individual If more, the test results of the sample are invalid.