Read 4839 RLBMA-Standard text version

RLBMA

Reconstituted Limestone Block Manufacturers Association

www.rlbma.com.au

RLBMA

Reconstituted Limestone Block Manufacturers Association

www.rlbma.com.au

Post Office Box 1021, Osborne Park BC WA 6916 [email protected]

I N D U S T R Y S TA N DA R D S P E C I F I C AT I O N - O N E M E T R E R E C O N S T I T U T E D L I M E S TO N E B L O C K

PREFACE CONTENTS

The Reconstituted Limestone Block Manufacturers Association (RLBMA) prepared this document. This industry document covers all one metre long reconstituted limestone blocks. Limestone blocks are classed as blocks that consist of at least 80% limestone. It specifies requirements for reconstituted block units and the requirements for the verification of their nominated minimum values. The industry addressed-- (a) The need for a basic guideline that specifies the essential properties common to all units covered by the scope of this document; (b) More stringent requirements that might need to be complied with, such as strength, precision, colour and texture, that would best be specified by the prospective purchaser as needed; and (c) Test methods consistent with Items (a) and (b). This document is intended to be a basic specification with which all reconstituted limestone blocks covered by the scope will comply, but over and above which more stringent requirements might be imposed as contractual requirements. This publication its contents and format are copyright of the RLBMA and may not be reproduced, copied or stored in any medium without prior, written authorisation from the Association. The RLBMA is wholly sponsored by the West Australian reconstituted block industry. Local or state regulations may require variation from the practices and recommendations contained in this publication. While the contents of this publication are believed to be accurate and complete, the information given is intended for general guidance and does not replace the services of professional advisers on specific projects. The RLBMA cannot accept any liability whatsoever regarding the contents of this publication. The following interests are represented on Industry Committee: Stoneridge Group BGC Blokstone/Blokpave Lido Limestone Archistone Meteorstone Limestone Resources Limestone Building Blocks Worley TABEC Western Geotechnics REVIEW OF INDUSTRY DOCUMENT To keep abreast of progress in industry, this industry document is subject to periodic review and is kept up to date by the issue of amendments or new editions as necessary. It is important therefore that users ensure that they are in possession of the latest edition, and any amendments thereto. Date of Issue - 20 September 2005

SECTION 1 - SCOPE AND GENERAL 1.1 SCOPE ....................................................................................................... 4 1.2 BLOCK GRADES ........................................................................................... 4 1.3 REFERENCED DOCUMENTS ........................................................................... 4 1.4 DEFINITIONS .............................................................................................. 4 1.5 NOTATION.................................................................................................. 4 SECTION 2 - PRODUCT REQUIREMENTS 2.1 GENERAL ................................................................................................... 5 2.2 DIMENSIONAL DEVIATIONS FROM WORK SIZE ................................................. 5 2.3 UNCONFINED COMPRESSIVE STRENGTH ......................................................... 5 2.4 DENSITY .................................................................................................... 5 2.5 BLOCK IDENTIFICATION................................................................................ 5 SECTION 3 - APPENDIX A 3.1 PRODUCT TEST METHODS ............................................................................. 6

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SECTION 1 - Scope & General

SECTION 2 - Product Requirements

1.1 SCOPE

This document specifies requirements for the verification of nominated minimum values (see Clause 1.4.2) of commercially manufactured one metre reconstituted limestone blocks for walling, retaining structures and landscaping. The reconstituted limestone blocks are manufactured with a minimum of 80% limestone. Reconstituted blocks manufactured from other types of materials are available. Confirmation should be sourced from the manufacturer on the properties of these blocks.

2.1 GENERAL

All units shall comply with the requirements of this Section. The suppliers of reconstituted blocks shall make available the work size, density and the minimum compressive strength (f ` min). Testing frequency is set at sampling and compliance testing of a minimum of 1 block in every 1066 manufactured.

2.2 DIMENSIONAL DEVIATIONS FROM WORK SIZE

2.2.1 The method for measuring the dimensions of individual reconstituted blocks is by the determination of dimensions of individual units. The deviation from work size of individual blocks (in millimetres) is detailed in Table 2.1. TABLE 2.1 DIMENSIONAL DEVIATION OF RECONSTITUTED BLOCKS

BLOCK TYPE RESIDENTIAL STANDARD LENGTH (mm) WIDTH (mm) HEIGHT (mm)

1.2 BLOCK GRADES

Reconstituted blocks fall under a number of grades depending on the location of the installed blocks. The grades are defined as follows:

GRADE RESIDENTIAL STANDARD HEAVY DUTY DESCRIPTION General purpose block utilised in residential applications Commercial block for commercial applications Heavy duty special purpose block

±10 ±15

±6 ±10

±6 ±10

This document is intended to be used in conjunction with the test methods specified in Appendix A. Testing to Section 2 in this document, which references the industry test methods, is required for compliance with the Document.

2.2.2 Dimensional consistency between deliveries The dimensions of units taken from all deliveries of units of the one type and the subject of a single order shall not differ by more than 15 mm over the length unit and 8mm over the width and height of the unit.

1.3 REFERENCED DOCUMENTS

The following documents are referred to: Australian Standard AS2193 - Calibration and classification of force-measuring systems; Australian Standard AS1012.9 - Determination of the compressive strength of concrete specimens.

2.3 MINIMUM COMPRESSIVE STRENGTH

2.3.1 The method for determining unconfined compressive strength is given in Appendix A. The minimum compressive strength for each of the block categories is detailed in Table 2.2. TABLE 2.2 MINIMUM COMPRESSIVE STRENGTH OF RECONSTITUTED BLOCKS

CATEGORY RESIDENTIAL STANDARD HEAVY DUTY MINIMUM COMPRESSIVE STRENGTH (mpa) 3.0 5.0 By agreement between supplier and purchaser

1.4 DEFINITIONS

For the purpose of this Document, the definitions below apply. 1.4.1 Block -- reconstituted limestone block formed from a minimum of 80% limestone aggregates. 1.4.2 Minimum value -- the lowest value determined from testing of the units in the lot. 1.4.3 Compressive strength -- the failure stress in compression, determined in accordance with Appendix A. 1.4.4 Face -- the surface of a unit intended to be exposed in a wall. 1.4.5 Lot -- a group of units of a single type with specific minimum's and dimensions presented for sampling at the same time. 1.4.6 Standard deviation -- the unbiased standard deviation determined in accordance with Appendix A. 1.4.7 Work size -- the size of a unit specified for its manufacture, from which deviations are measured.

2.4 DENSITY

2.4.1 The method for determining mass per unit volume (density) is given in Appendix A. The minimum air dry density for each of the block categories is detailed in Table 2.3. TABLE 2.3 MINIMUM DENSITY OF RECONSTITUTED BLOCKS

CATEGORY RESIDENTIAL STANDARD HEAVY DUTY MINIMUM DENSITY (kg/m3) 1,700 1,800 By agreement between supplier and purchaser

1.5 NOTATION

The following notation is used in this document: n = number of specimens in the test sample. s = unbiased standard deviation determined in accordance with Appendix A. f = compressive strength of blocks, expressed in megapascals (MPa), when tested in accordance with Appendix A. fmin = minimum compressive strength, expressed in megapascals (MPa), when tested in accordance with Appendix A. P = maximum load applied to block for failure expressed in kilonewtons (kN). P1 = mass of upper platen expressed in kilograms (kg). L = length of block expressed in millimetres (mm). W = width of block expressed in millimetres (mm). H = height of block expressed in millimetres (mm).

2.5 BLOCK IDENTIFICATION

2.4.1 The supplier shall ensure that by any means the pack of blocks delivered to site clearly identifies manufacturer, batch and category.

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SECTION 3 - Appendix A

3.9 CALCULATIONS

METHOD FOR THE DETERMINATION OF COMPRESSIVE STRENGTH AND MASS PER UNIT VOLUME OF BLOCKS

The following calculations are required: 3.9.1 LOAD AREA Calculate the load area (to nearest mm2) as follows: If the platen dimensions exceed the dimensions of the block calculate the load area: LxW; If the block dimensions exceed the dimensions of the platens calculate the load area: 440x240=105600mm2. 3.9.2 MASS PER UNIT VOLUME Calculate the mass per unit volume (to nearest kg/m3) as follows: Mass/Volume (kg/m3) = 109xM/(LxWxH) 3.9.3 COMPRESSIVE STRENGTH Calculate the compressive strength (to nearest 0.1MPa) as follows: Compressive Strength (f') = (P+p1)x1000/Load Area

3.1 SCOPE

This test method covers the determination of the compressive strength and mass per unit volume of reconstituted blocks. The reconstituted blocks are typically of reconstituted cement bound limestone or aggregate. It allows for block specimen sizes up to nominal L500xW350xH350mm.

3.2 PRINCIPLE

A block specimen is measured for its linear dimensions and its mass is determined to calculate its mass per unit volume. It is then compressed at a specified rate and the force required to achieve failure is recorded. The compressive strength is a function of the failure load divided by the area under stress.

3.10 REPORTING RESULTS

The following information shall be reported: a) Date of manufacture of specimens (if known); b) Laboratory sample number; c) Location of specimens (if known); d) Identification of batch; e) The dimensions of load area; f) The nominal height of the specimen (to nearest mm); g) Sampling details as supplied; h) Date of testing of each specimen; i) Age of specimen (if known); j) Mass per unit volume of each specimen in kg/m3; k) Maximum load applied of each specimen in kN; l) Compressive strength of each specimen calculated to 0.1MPa; m) Mean Compressive strength of each specimen calculated to 0.1MPa; n) Standard deviation of the unbiased compressive strength calculated to 0.1MPa.

3.3 NUMBER OF SPECIMENS

The number specimens tested shall be 1 block in every 1066, or at least 5 blocks in any one represented lot.

3.4 TEST DATES

The age of testing shall be at least 28 days for determination against nominated values.

3.5 APPARATUS

The following apparatus is required: a) Ruler: A steel rule with minimum length of 600mm and capable of measuring accurately to 1mm; b) Testing Machine: A suitable testing machine capable of applying a load up to 1500kN at the specified rate and complying with the Grade A requirements of AS2193; c) Platens: Two platens complying to the requirements of AS1012.9 for hardness and planeness with minimum dimension of L440xW240mm capable of supporting the maximum load without distorting. Record the mass of the upper platen in kN (p1); d) Weighing: A balance readable and accurate to 500g, capable of weighing the specimen. Specimens typically weigh 110-130kg; e) Lifting: (Optional) A certified lifting device capable of lifting and transporting the specimens.

3.6 STORAGE OF SPECIMENS

Specimens are to be stored under normal field conditions.

3.7 PREPARATION OF SPECIMENS

Specimens are tested in an air dried condition.

3.8 TEST PROCEDURE

Test procedure is detailed as follows: 3.8.1 Weigh each specimen and record the mass (M) to the nearest 500g. Measure along the centreline of each dimension to record the average length (L), width (W), and height (H) to the nearest millimetre (mm). 3.8.2 Place the specimen onto the compression machine such that it is positioned centrally on the lower platen in the "as laid" orientation. Place the upper platen into position on the block and centrally locate so that it applies the full force through the block to the lower platen. 3.8.3 Bring the compression machine to bear on the platens and commence loading, without shock, at the rate of 24MPa per minute until maximum load is recorded. Whilst loading maintain a constant load rate until failure. 3.8.4 Record the maximum load at failure (P).

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