SOUTH AFRICAN NATIONAL STANDARD

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1 ISBN SOUTH AFRICAN NATIONAL STANDARD Civil engineering test methods Part-GR54: Determination of the indirect tensile strength of compacted and cured specimens of cementitiously stabilized materials WARNING This document references other documents normatively. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001 Tel: Fax: SABS

2 Table of changes Change No. Date Scope Amdt Amended to update the introduction. Acknowledgement The SABS Standards Division wishes to acknowledge the valuable assistance of the Committee of Transport Officials (COTO), and the South African National Roads Agency Limited (SANRAL). Foreword This South African standard was approved by National Committee SABS/TC 081/SC 04, Construction materials, products and test methods Road and pavement materials testing, in accordance with procedures of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This document was approved for publication in December This document supersedes SANS 3001-GR54:2010 (edition 1). A vertical line in the margin shows where the text has been technically modified by amendment No. 1. SANS 3001 consists of different parts under the general title Civil engineering test methods. Parts GR of the SANS 3001 series contain methods for testing gravel, sand and soil. Annex A is for information only.

3 Introduction This part of SANS 3001 is used to check the quality of cementitiously stabilized materials proposed for and used as construction materials. "Stabilization" is the commonly used term that covers methods used to enhance the engineering strength properties of road construction materials. The indirect tensile strength test is used to assess the effect of cementitious stabilizing agents (usually cement or hydrated lime) on the strength of materials. Indirect tensile strength data may be used a) as a guide for determining the most effective stabilizing agent for a particular type of material, b) to determine the stabilizer content that is required to achieve the specified strengths, or c) as a production or acceptance control measure, to check the indirect tensile strength of stabilized materials from samples taken in the field. Amdt 1 Apparatus dimensions that are critical to the outcome of the method or procedure are given with a tolerance. All other dimensions are nominal and should be considered fit for purpose. Existing apparatus that conforms to the requirements of TMH 1 may be used in this method until it is no longer fit for purpose. This part of SANS 3001 forms part of a set of tests for stabilized materials which include the following: laboratory mixed maximum dry density (see SANS 3001-GR31); preparation, compaction and curing of test specimens, laboratory mixed (see SANS 3001-GR50); preparation, compaction and curing of test specimens, field mixed (including maximum dry density) (see SANS 3001-GR51); preparation of field cores (see SANS 3001-GR52); unconfined compressive strength (see SANS 3001-GR53); and indirect tensile strength (see SANS 3001-GR54). This part of SANS 3001 is classified as Group: B, Rating: 1, Activity: GR, in accordance with the requirements of the South African Construction Education and Training Authority (CETA). 1

4 SANS 3001-GR Contents Page Acknowledgement Foreword Introduction 1 Scope Normative references Definitions Apparatus Test sample preparation Procedure Calculations Test report... 7 Annex A (informative) Example of the calculation method

5 Civil engineering test methods Part-GR54: Determination of the indirect tensile strength of compacted and cured specimens of cementitiously stabilized materials 1 Scope This part of SANS 3001 applies to cementitiously stabilized material (crushed stone, gravel, sand and soil), and describes a method to determine the indirect tensile strength of test specimens that have been prepared, compacted and cured in accordance with SANS 3001-GR50, SANS 3001 GR51, or SANS 3001-GR52. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. Information on currently valid national and international standards can be obtained from the SABS Standards Division. SANS 3001-GR50, Civil engineering test methods Part GR50: Preparation, compaction and curing of specimens of laboratory mixed cementitiously stabilized materials. SANS 3001-GR51, Civil engineering test methods Part GR51: Sampling, preparation, compaction and curing of field mixed freshly cementitiously stabilized materials including the determination of the maximum dry density and optimum moisture content. SANS 3001-GR52, Civil engineering test methods Part GR52: Sampling and preparation of cored specimens of field compacted, matured, cementitiously stabilized material. SANS 3001-PR1, Civil engineering test methods Part PR1: Determination of uncertainty of measurement, repeatability, reproducibility and bias. 3 Definitions For the purposes of this document, the following definitions apply. 3.1 acceptable acceptable to the authority administering this standard, or to the parties concluding the purchase contract, as relevant 3