1、PUBLISHED DOCUMENT PD 6678:2005 Guide to the specification of masonry mortar ICS 91.100.10 PD 6678:2005 This Published Document was published under the authority of the Standards Policy and Strategy Committee on 30 December 2005 BSI 30 December 2005 First published December 2005 The following BSI re
2、ferences relate to the work on this Published Document: Committee reference B/519/2 ISBN 0 580 46720 1 Committees responsible for this Published Document The preparation of this Published Document was entrusted by Technical Committee B/519, Masonry and associated testing, to Subcommittee B/519/2, Mo
3、rtar, upon which the following bodies were represented: Autoclaved Aerated Concrete Products Brick Development Association British Cement Association British Lime Association British Vermiculite Association Cementitious Slag Makers Association CERAM Civil Engineering Test Equipment Manufacturers Ass
4、ociation Federation of Plastering and Drywall Contractors Institute of Concrete Technology Institution of Structural Engineers National Specialist Contractors Council National House-Building Council Office of the Deputy Prime Minister (Building Research Establishment) Quarry Products Association Uni
5、ted Kingdom Quality Ash Association Co-opted member Amendments issued since publication Amd. No. Date CommentsPD 6678:2005 BSI 30 December 2005 i Contents Page Committees responsible Inside front cover Foreword ii Introduction 1 1S c o p e 1 2 Normative references 1 3 Terms and definitions 2 4 Gener
6、al 4 5 Methods of specifying masonry mortar 4 6 The specification of masonry mortars 10 7 Drafting a specification 12 8 General clauses to be included in all site made masonry mortar specifications 13 Annex A (informative) Quantities of mortar for use in laying bricks and blocks 26 Annex B (informat
7、ive) Pre-packed dry ready-to-use mortars 26 Bibliography 27 Table 1 BS 5628 prescribed mortar designations (mixed by volume) and their compressive strength 7 Table 2 BS 5628 prescribed mortar designations (mixed by mass) and their compressive strength 8 Table 3 Properties of mortar 9 Table 4 Propert
8、ies of mortar 10 Table 5 Properties of mortar affecting its characteristics 11 Table 6 Proportions for BS 5628 prescribed cement:lime:sand mortar designation based on site mixed and premixed lime:sand 22 Table 7 Bulk densities 22PD 6678:2005 ii BSI 30 December 2005 Foreword This Published Document h
9、as been prepared under the direction of Subcommittee B/519/2. It supersedes PD 6472:1974, which is withdrawn. Changes in mortar standardization in the United Kingdom occurred with the introduction of the European specification for mortar for masonry, BS EN 998. It covers factory made mortar, however
10、, it does not give guidance on site made mortar. This Published Document gives some guidance on the specification of factory made masonry mortar conforming to BS EN 998-2 but is mainly aimed at providing guidance on the specification of site made masonry mortar. This guidance on the specification of
11、 site made masonry mortar takes into account the requirements of BS EN 998-2 and takes information from the withdrawn PD 6472, a guide to specifying the quality of building mortars. This Published Document also takes into account the guidance given in the code of practice for use of masonry, BS 5628
12、. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. This Published Document is not to be regarded as a British Standard. Summary of pages This document comprises a front cover, an inside front cover, pages i to
13、 ii, pages 1 to 27 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.PD 6678:2005 BSI 30 December 2005 1 Introduction Traditionally in the United Kingdom mortar has been primarily specified in terms of volume or mass proportions, the “p
14、rescriptive” or “recipe” approach, so called because it gives a prescription for the mix proportions. This method is used in the code of practice for use of masonry BS 5628, and was used in the specification for ready-mixed building mortar BS 4721 and in the specification for prepacked mortar mixes
15、BS 5838-2. The alternative method of specifying mortars, based on measured parameters such as minimum compressive strength, is known as the “design” or “performance” approach. For example, BS 4721 required that a minimum compressive strength was achieved. The performance approach is specified in BS
16、5628-3. BS EN 998 is the new British Standard for the specification of mortar for masonry, including the specification of constituent materials. It specifies requirements for designed mortars and, to a lesser extent, prescriptive mortars. Its publication has brought about a need to withdraw or updat
17、e existing British Standards. Therefore, BS 4721:1981 and BS 5838-2:1980 have been superseded by both BS EN 998-1:2003 and BS EN 998-2:2003. 1 Scope This Published Document gives guidance on the specification of prescribed and designed: a) factory made masonry mortar conforming to BS EN 998-2; and b
18、) site made masonry mortar. This Published Document is intended to be used in conjunction with the code of practice for masonry, BS 5628 and the specification for masonry mortar, BS EN 998-2. 2 Normative references The following referenced documents are indispensable for the application of this docu
19、ment. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. BS 3177, Method for determining the permeability to water vapour of flexible sheet materials used for packaging. BS 5628-1:2005, Code
20、of practice for the use of masonry Part 1: Structural use of unreinforced masonry. BS 5628-2:2005, Code of practice for the use of masonry Part 2: Structural use of reinforced and prestressed masonry. BS 5628-3:2005, Code of practice for the use of masonry Part 3: Materials and components, design an
21、d workmanship. BS 8500-2:2002, Concrete Complimentary British Standard to BS EN 206-1 Part 2: Specification for constituent materials and concrete. BS 6100 (all parts), Glossary of building and civil engineering terms. BS EN 459-1, Building lime Part 1: Definitions, specifications and conformity cri
22、teria. BS EN 934-3, Admixtures for concrete, mortar and grout Part 3: Admixtures for masonry mortar Definitions, requirements, conformity, marking and labelling. BS EN 998-2:2003, Specification for mortar for masonry Part 2: Masonry mortar. BS EN 1008, Mixing water for concrete Specification for sam
23、pling, testing and assessing the suitability of water, including water recovered from processes in the concrete industry, as mixing water for concrete. BS EN 1015-1, Methods of test for mortar for masonry Part 1: Determination of particle size distribution (by sieve analysis). BS EN 1015-2, Methods
24、of test for mortar for masonry Part 2: Bulk sampling of mortars and preparation of test mortars. BS EN 1015-3, Methods of test for mortar for masonry Part 3: Determination of consistence of fresh mortar (by flow table).PD 6678:2005 2 BSI 30 December 2005 BS EN 1015-4, Methods of test for mortar for
25、masonry Part 4: Determination of consistence of fresh mortar (by plunger penetration). BS EN 1015-6, Methods of test for mortar for masonry Part 6: Determination of bulk density of fresh mortar. BS EN 1015-7, Methods of test for mortar for masonry Part 7: Determination of air content of fresh mortar
26、. BS EN 1015-9, Methods of test for mortar for masonry Part 9: Determination of workable life and correction time of fresh mortar. BS EN 1015-10, Methods of test for mortar for masonry Part 10: Determination of dry bulk density of hardened mortar. BS EN 1015-11, Methods of test for mortar for masonr
27、y Part 11: Determination of flexural and compressive strength of hardened mortar. BS EN 1015-17, Methods of test for mortar for masonry Part 17: Determination of water-soluble chloride content of fresh mortars. BS EN 1015-18, Methods of test for mortar for masonry Part 18: Determination of water abs
28、orption coefficient due to capillary action of hardened mortar. BS EN 13055-1, Lightweight aggregates Part 1: Lightweight aggregates for concrete,mortar and grout. BS EN 13139, Aggregates for mortar. 3 Terms and definitions For the purposes of this Published Document, the terms and definitions given
29、 in BS EN 998-2, BS 6100 and the following apply. 3.1 addition finely divided material used in mortar in order to improve certain properties or to achieve special properties 3.2 binder material used to hold solid particles together in a coherent mass NOTE Examples of binders include cement and build
30、ing lime. 3.3 CE marking mark signifying that a product conforms to the essential requirements of the relevant European Directive(s) and that the product has been subject to the appropriate conformity assessment procedure(s) NOTE Harmonized European Standards are standards that include essential req
31、uirements from relevant European Directives. The level of attestation of conformity for CE marking purposes applicable to a particular product is decided by the European Commission and is included within the appropriate harmonized European product standard. There are six levels of attestation of con
32、formity, some requiring third party involvement. 3.4 combination restricted range of Portland cements and additions, which have been combined in the mortar mixer 3.5 designed masonry mortar mortar with a composition and method of manufacture that is chosen by the producer in order to achieve specifi
33、ed properties BS EN 998-2, definition 3.2.1 3.6 factory made masonry mortar mortar batched and mixed in a factory NOTE Factory made mortar can be either “dry” mortar which is ready-mixed and requires only the addition of water or “wet” mortar which is supplied ready for use. BS EN 998-2, definition
34、3.4.1PD 6678:2005 BSI 30 December 2005 3 3.7 factory production control system consisting of procedures for the internal control of production, which has the objective of ensuring that products placed on the market conform to standard requirements and the declared values 3.8 fresh masonry mortar pla
35、stic masonry mortar mortar completely mixed and ready for use NOTE The term plastic masonry mortar is sometimes used instead of fresh masonry mortar, particularly for mixes containing a cement set retarder. 3.9 initial type testing testing undertaken prior to placing a product on the market and when
36、 changes occur, either in the basic materials or manufacturing procedures, which could affect the characteristics of the product 3.10 manufacturer person who makes mortar either in a factory or on site NOTE Traditionally the term associated with site made mortar production has been producer rather t
37、han manufacturer. 3.11 prebatched semi finished factory made masonry mortar mortar with constituents wholly batched in a factory, supplied to the building site and mixed there according to the manufacturers specification and conditions BS EN 998-2, definition 3.4.2.1 3.12 premixed lime:sand semi fin
38、ished factory made masonry mortar with constituents wholly batched and mixed in a factory, supplied to the building site where further constituents specified or provided by the factory are added technically equivalent to BS EN 998-2, definition 3.4.2.2 NOTE Historically this material has sometimes b
39、een known as ready-mixed lime:sand. 3.13 site mixed lime:sand semi finished site made masonry mortar with constituents wholly batched and mixed on a building site where further constituents are added NOTE Historically this material has sometimes been known as coarse stuff, a term which is now deprec
40、ated. 3.14 prescribed masonry mortar mortar made in predetermined proportions, the properties of which are assumed from the stated proportions of the constituents BS EN 998-2, definition 3.2.2 3.15 reference panel panel of masonry erected and retained on a building site, used to establish the visual
41、 acceptability of materials and workmanship to be maintained during construction work BS 5628-3, definition 3.48 3.16 workable life time from the end of manufacture or final mixing of the masonry mortar until the mortar reaches a defined limit of resistance to penetration of a rod forced into it NOT
42、E The workable life of mortar is determined in accordance with BS EN 1015-9.PD 6678:2005 4 BSI 30 December 2005 4 General The relationship between fresh (plastic) mortar and hardened mortar is complex. The properties of fresh (plastic) mortar affect the properties of the hardened mortar and the two
43、cannot be considered in isolation. Traditionally the craftsman has been left to adjust the proportions of the constituents to produce a mortar which can be handled easily and in the experience of the craftsman would be adequate. However, requirements for strength or other important properties cannot
44、 be satisfied by this approach, as it can unduly consider the short term properties of the fresh mortar at the expense of the properties of the hardened mortar. While it is important for a mortar to be of suitable consistence for the craftsman to use, this requirement should not conflict excessively
45、 with the desired hardened properties. It is seen therefore that whilst the craftsman can clearly be permitted to exercise choice with respect to the fresh (plastic) properties, some of the hardened properties should also be considered. This means that specifications for mortar need to state limitin
46、g values for mix proportions which should not be reduced or exceeded. It is fortunate that some properties of mortar are relatively insensitive to normal performance or prescriptive requirements. For example, the thermal properties of a mortar are not greatly affected by the strength or the relative
47、 proportions of the materials, but are affected significantly by the choice of the density of the aggregate and to a much more limited extent by any air entrainment. 5 Methods of specifying masonry mortar 5.1 General BS 5628 gives guidance on the design of masonry structures, including the design of
48、 masonry mortar. The type of masonry mortar recommended for use differs for various conditions of design and exposure. This means that differing structural requirements give rise to the need for different mortar types. Similarly the durability environment will also impose requirements on the mortar
49、type. These two influences mean that a mortar should be specified to take each need into account, without prejudicing the other. An overview of the methods by which mortar can be specified is given in 5.2, 5.3 and 5.4. 5.2 Prescribed mortars A “prescriptive” or “recipe” approach to mortar production involves detailing all of the constituent materials for the mortar and the recipes used to combine them.
