Committees responsible for this British Standard

The preparation of this British Standard was entrusted by the Cement, Gypsum, Aggregates and Quarry Products Standards Policy Committee (CAB/-) to Technical Committee CAB/2, upon which the following bodies were represented:

Aggregate Concrete Block Association
Association of Consulting Engineers
Association of Consulting Scientists
Association of Lightweight Aggregate Manufacturers
Brick Development Association
British Aggregate Construction Materials Industries
British Cement Association
British Ceramic Research Ltd.
British Civil Engineering Test Equipment Manufacturers’ Association
British Geological Sciences
British Precast Concrete Federation Ltd.
British Ready Mixed Concrete Association
British Steel Industry
Building Employers’ Confederation
Calcium Silicate Brick Association Ltd.
Chartered Institute of Building
Concrete Society
County Surveyor’s Society
Department of the Environment (Property Services Agency)
Department of the Environment (Building Research Establishment)
Department of Transport (Highways)
Department of Transport (Transport and Road Research Laboratory)
Electricity Supply Industry in England and Wales
Federation of Civil Engineering Contractors
Institute of Concrete Technology
Institution of Civil Engineers
Institution of Highways and Transportation
Institution of Structural Engineers
Institution of Water and Environmental Management (IWEM)
Mortar Producers’ Association Ltd.
Sand and Gravel Association Ltd.
Society of Chemical Industry

This British Standard, having been prepared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1990

The following BSI references relate to the work on this standard:

Committee reference CAB/2
Draft for comment 86/10156 DC

Foreword

This Part of BS 812 has been prepared under the direction of the Cement, Gypsum, Aggregates and Quarry Products Standards Policy Committee. It is a revision of clause 10 of BS 812‑3:1975, for the determination of the polished-stone value of an aggregate. It is also a revision of the alternative method for determining the polished-stone value described in clause 11 of Amendment No. 2 to BS 812‑3:1975, which was published in March 1983. The method in this new Part 114 supersedes those described in clause 10 and clause 11, both of which are now withdrawn. The remainder of BS 812‑3 is also being revised and it is intended to issue further separate Parts or Sections of the standard.

This test method for determining the polished-stone value is basically that described in clause 11 of BS 812‑3:1975. The main changes are as follows.

The procedure for mounting the aggregate in a sand cement mortar is no longer described; only the resin mounting method is to be used.
The previous method determined an average value from four specimens conditioned on one test run. The revised method requires the conditioning of four specimens in two pairs on two separate test runs.

It is intended that other British Standards on aggregates should call up BS 812 test methods as the basis for compliance. Nevertheless it is not intended that all aggregates will be subjected regularly to all the listed tests. Specifications in other standards should call up only relevant test methods. Some of the tests specified in other Parts of this standard are of limited application and advice on the use of simpler quantitative tests is given, for example, when they can be used for a preliminary sorting of aggregates to see whether more precise and expensive testing is justified.

Reference should be made to BS 812‑101:1984 for general guidance on testing aggregates, precision of test methods and variance arising from sampling errors.

A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application.

Compliance with a British Standard does not of itself confer immunity from legal obligations.

1 Scope

This Part of BS 812 describes the method for determining the polished-stone value (PSV) of an aggregate.

NOTE The titles of the publications referred to in this standard are listed on Inside back cover.

2 Definitions

3 Principle

4 Sampling¹⁾

5 Apparatus

5.1

5.2 Friction tester

5.4

5.5

6 Materials

6.1

6.2

6.3

6.4

7 Preparation of specimens

7.1

7.2

7.3

7.4

7.5

7.6

7.7

7.8

8 Conditioning of tyre

8.1

8.2

9 Accelerated polishing of specimens

9.1

9.2

9.3

9.4

9.5

9.6

9.7

9.8

10 Friction test procedure

10.1

10.2

10.3

10.4

10.5

11 Calculations

11.1

11.2

11.3

12 Expression of results

13 Precision

14 Test report

Publications referred to

BS 812-114:1989

Testing aggregates - Method for determination of the polished-stone value

Current, Under Review

Published:

28 Feb 1990