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IS 9103 (1999): Specification for Concrete Admixtures

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2 NORMATIVE REFERENCES ... given in Annex B, in such case the relative durability ... Sl No. Requirements Accele- Retarding Water Air-Entrain- Superplasticizing Test rating Admixture Reducing ing (for Water- Ref Admixture Admixture Reduced Concrete Mix) (1) (2) i) Water content, ...

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Transcription of IS 9103 (1999): Specification for Concrete Admixtures

1 Disclosure to Promote the Right To InformationWhereas the Parliament of India has set out to provide a practical regime of right to information for citizens to secure access to information under the control of public authorities, in order to promote transparency and accountability in the working of every public authority, and whereas the attached publication of the Bureau of Indian Standards is of particular interest to the public, particularly disadvantaged communities and those engaged in the pursuit of education and knowledge, the attached public safety standard is made available to promote the timely dissemination of this information in an accurate manner to the public. ! $ ' + - Satyanarayan Gangaram Pitroda Invent a New India Using Knowledge 0 1 ' 5 Jawaharlal Nehru Step Out From the Old to the New 1 + , 1 + Mazdoor Kisan Shakti Sangathan The Right to Information, The Right to Live !

2 > 0 B Bhart hari N ti atakam Knowledge is such a treasure which cannot be stolen Invent a New India Using Knowledge IS 9103 (1999): Specification for Concrete Admixtures -[CED 2: Cement and Concrete ]IS 9103 : 1999 Indian Standard C-ONCRETE Admixtures - Specification ( First Revision ) ICS Q BIS 1999 BUREAU OF INDIAN STANDARDS MANAK BHAVAN, 9 BAHADUR SHAHZAFARMARG NEW DELHI 110002 April 1999 Price Group 7 Cement and Concrete Sectional Committee, CED 2 FOREWORD This Indian Standard ( First Revision ) was adopted by the Bureau of Indian Standards, after the draft finalized by the Cement and Concrete Sectional Committee had been approved by the Civil Engineering Division Council. Admixtures are materials added to the Concrete before or during its mixing, with a view to modifjring one or more of the properties of Concrete in the plastic or hardened state.

3 An important feature of the majority of Admixtures for Concrete is that it is difficult to quantitatively evaluate the behaviour of the Concrete under various possible circumstances. Therefore, performance of an admixture is evaluated by comparing the properties of Concrete with the admixture under test with those of Concrete without any admixture or with a reference admixture. This standard lays down the procedure for such a relative evaluation of Admixtures for Concrete . In recent time there has been a lot of development in the field of Admixtures . Superplasticizers, both normal and retarding type, constitute a major group of Admixtures used by site engineers now. Superplasticizers help in lowering the water/cement ratio so as to contribute to the enhancement of durability. In this first revision of the standard, first published in 1979, requirements of superplasticizers in detail and methods of determination of flow of Concrete of high workability have been added.

4 This standard also gives uniformity tests which demonstrate that a particular consignment is similar to material that has previously been submitted to the acceptance test. The Admixtures covered in this standard are intended mainly for modifying a single property in Concrete , but some of the Admixtures available in the market are often capable of modifying more than one property of-the Concrete . In addition, an admixture may be used to improve the desirable properties of Concrete in more than one way. For example, water reducing Admixtures ( see ) may be used to improve the workability of Concrete with the same water and cement contents, to increase the compressive strength without changing the workability by reduction of the water content in the Concrete mix or to effect saving in cement content by reduction in both the cement and water contents in the mix while maintaining the same workability and compressive strength as in~the reference Concrete .

5 In such cases, the procedure of evaluation of the admixture may have to be appropriately chosen. This standard also provided for evaluation of Admixtures for specific use with the materials and mix proportions to be used on the work. The performance of Concrete Admixtures including superplasticizers depend upon both the Admixtures and the cement and their compatibility, in addition to the~ Concrete mix proportions and the environmental conditions in the field. Among the characteristics of the cement, which affect the performance of Concrete Admixtures including superplasticizers are the &A, SO, and alkali contents, nature of sulphates, and the fineness. The ambient temperature and humidity conditions influence the performance of set-controlling Admixtures and affect the retention of enhanced workability ( slump loss ) when water-reducing admixtues and superplasticizers are used.

6 While no generalisation of these effects is possible, it is nevertheless necessary to evaluate Concrete Admixtures for specific use with the Concrete -making materials and mix proportions to be used on the work, under lield conditions. This standard also provides for such specific evaluation of an admixture, in addition to the general evaluation for confomity to the requirements of this standard. The requirements of integral waterproofing Admixtures are covered in IS 2645 : 1975 Specification for integral cement waterproofing compounds (first revision ) . 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 : 1960 Rules for rounding off numerical values ( revised) . The number of significant places retained in the rounded off value should be the same as that of the specified value in this standard.

7 IS 9103 : 1999 Indian Standard Concrete Admixtures - Specification ( First Revision ) 1 SCOPE This standard covers the chemical and air- entraining Admixtures including superplasticizers, solid or liquid or emulsion, to be added to cement Concrete at the time of mixing so as to achieve the desired property in Concrete , in the plastic or hardened state. The different types of Admixtures covered in this standard are as follows: a) Accelerating Admixtures , b) Retarding Admixtures , c> Water-reducing Admixtures , d) Air-entraining Admixtures , and -3 Superplasticizing Admixtures . The chloride content in the admixture shall be declared by the manufacturer. Superplasticizers are expected to be chloride free. Admixtures that contain relatively large amounts of chloride may accelerate corrosion of prestressing steel. Where corrosion of such steel is of major concern, compliance with the requirement of this Specification does not constitute assurance of acceptability of the admixture for use in prestressed Concrete .

8 In case of reinforced Concrete , to minimize the chances of deterioration of Concrete , the total chloride content in the Concrete should be limited as specified in IS 456. 2 normative REFERENCES The Indian Standards listed in annex A contain provisions which through reference in this text, constitute provision of this standard. At the time of publication the editions indicated were valid. All standards are subject to revision, and parties to agree- ment based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated in annex A. 3 TERMrNOLQGY For the purpose of this standard, the following definitions shall apply. Admixtures A material other than water, aggregates, and hydraulic cement and additives like pozzolana or slag and fibre reinforcement used as an ingredient of Concrete or mortar and added to the batch immediately before or during its mixing to modify one or ~more of the properties of Concrete in the plastic or hardened state.

9 Accelerating Admixture or Accelerator An admixture when added to Concrete , mortar or grout, increases the rate of hydration of a hydraulic cement, shortens the time of set, or increases the rate of hardening or strength development. Retarding Admixture or Retarder An admixture which delays the setting of cement paste, and hence of mixtures, such as mortar or Concrete containing cement. Water Reducing Admixture or Workability Aid An admixture which either increases workability of freshly mixed mortar or Concrete without increasing water content or maintains workability with a reduced amount of water. Air-Entraining Admixtures An admixture for Concrete or mortar which causes air to be incorporated in the form of minute bubbles in the Concrete or mortar during mixing, usually to increase workability and resistance to freezing and thawing and~disruptive action of de-icing salts.

10 Superplasticizing Admixtures An admixture for mortar or Concrete which imparts very high workability or allows a large decrease in water content for a given workability. Retarding Superplasticizing Admixture Superplasticizing admixture that imparts prolonged workability retention and retards setting. 4 REQUIREMENTS FOR Admixtures Concrete made with Admixtures when compared with identical Concrete made without the admixture~in accordance with 7 and 8 shall conform to the requirements appropriate to the type of admixture given in Table 1A and Table ll3, except in the case of air- entraining admixture. In the case of air-entraining Admixtures , a reference admixture of approved quality shall be used in the control Concrete to entrain identical amount of air. NOTE - If required by the purchaser, the Concrete with air-entraining admixture may be tested for resl\rance to freezing and thawing in accordance with theprocedurc given in annex B, in such case the relative durability factor of the Concrete with admixture under test shall be not less than 80.


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