Thanks again, but on the planning portal the approved doc h talks about small soakaways serving 25m2 or less and then says for larger soakaways ie 34m2 refer to paragraph 3. Revision to concrete in aggressive ground guidance. The total sulphate test does not test for sulphides, as these are destroyed in preparation, and is not now considered a good guide to sulphate attack longworth, 2004 64. Contact bre for information about its services, or for technical advice. However, due to a lack of suitable specifications, there has. This is used to create products, tools and standards that drive positive change across the built environment. Sulphate and acid resistance of concrete in the ground. We use our cutting edge research to develop a range of products, services, standards and qualifications that are used around the world to bring about positive change in the built. Bre has a longestablished reputation for the technical and information papers produced by the building research establishment now known just as bre and its predecessor, the building research station brs. New uk guidance on the use of concrete in aggressive ground. Guidance on designing concretes to resist conventional sulfate attack was developed in a series of bre digests, the most recent of which was digest 363 sulfate and acid resistance of concrete in the ground, the first edition of which was published in 1991. Full text of bre digest 436 part 1 wind load on buildings. In recent years, soakaways have been used within urban, fullysewered areas to limit the impact on discharge of new upstream building works and to avoid.
Concrete will generally be grade c3540 and class 1 to bre digest 363. Sulfate class for site as bre digest 363 design chemical class as bre special digest 1 class 4 dc4 part 4 of bre special digest 1 recommends that the structural performance level for concrete pipes should be considered as normal. The uk guidance for specification of concrete in aggressive ground has been revised following the discovery of the thaumasite form of sulfate attack in the foundations to highway bridges in england in 1998. The possible sinking of boreholes and plumb and level surveys bre, 1995.
It replaces the 2003 edition and has been revised to reflect new thinking and changes to. The chemical resistance of stanton bonna concrete drainage products may therefore be classified as follows. Removes an unreliable two point electrical resistivity test. This manual has been produced to enlighten and inform those who are in some way. The results of the study and the conclusions were published in bre digest 251 assessment of damage in lowrise buildings. Bre digesst guide for civil engineers by likhin1 in types brochures e bre digest guide. The british building research establishment digest 363 july 1991 entitled sulphate and acid resistance of concrete in the ground is strongly recommended for further reading on the impact of sulphates and precautions which can be taken. Five levels of classification are given that are equivalent to those given in bre digest 363 now superseded.
If chemical reaction appears to be the cause, samples of material for laboratory testing should be taken. Bre digest 365 soakaway design designing buildings wiki share your construction industry knowledge. Specification is shown as maximum free watercement ratio, minimum cement content and type of cement. We also produce a number of longer textbooks and reference books, including the green guide to specification.
It replaces the 2003 edition and has been revised to reflect new thinking and changes to british standards. However, a high proportion of older buildings are affected by rising damp to some degree or another. Following consultation with industry, a new bre special digest 1 was published in september. Dig 366 structural appraisal of existing buildings for. Materials in situ concretecement concrete testing special subject areas. Each increment in concrete quality is counted as an extra apm. Free to use bim project management tool provides stepbystep help to define, manage and. This has resulted in a bre guidance document with a wider scope than its predecessors. Bre is the uks leading centre of expertise on the built environment, construction, sustainability, energy, fire and many associated issues. Free to use bim project management tool provides stepbystep help to define, manage and validate responsibility. In the early 1990s, the thaumasite form of sulfate attack tsa became recognised as a.
Read a comparison of classification systems for aggressive ground with thaumasite sulfate attack measured at highway structures in gloucestershire, uk, cement and concrete composites on deepdyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips. Dig 366 structural appraisal of existing buildings for change. The water rises through the pores capillaries in the masonry by a process loosely termed capillarity. Complementary british standard to bs en 2061 bs en 2061. Bre digest 363 building research establishment, 1991.
Bre digest 365 is a very commonly used guidance document for the design of soakaways in the uk. The new guidance has been issued jointly in bre special digest 1. Consequently the requirement in digest 363 for aggregate concrete blocks to have 50% of the least crosssectional area to be carbonated for sulphate soil classifications ds2 and 3 has been replaced by a requirement for blocks to be surface. Bre is owned by the bre trust, a registered charity. Guidance in bre digests has necessarily evolved to cater. This guide considers the ph and presence of magnesium ion as well as the sulphate. The current bre digest 330 was published in 2004 1 updating the previous edition published in 1999 2. A comparison of classification systems for aggressive. I rcaiii must not replace more than 20% of natural aggregate. Bre sd 1 parts 14 2001 with amendments 2003, which replaced bre digests 363, 250 and 174.
Gives guidance for professional engineers on the structural appraisal of existing buildings for a change of use, in particular as required by the building regulations for england and wales. Bre digest 363 has been revised to incorporate the findings of the thaumasite expert group, and has been issued as sd1. Guidance levels for damage from groundborne vibration were introduced in two british standards in 1992 and 1993. In addition to attack on concrete, industrial fill can cause disruption to buildings constructed on it by volume changes within the fill due to pyrites oxidation or expansive steel slag. Recycled aggregates crushed concrete and brick masonry have long been used in the uk and overseas construction industries. Article the significance of cracks in lowrise buildings. The guidance for concrete in aggressive ground has been radically revised as compared to digest 363. Bre digest 363 classifies the severity of sulphate conditions, and recommends concrete specifications for the different classes. Bre digest 365 civilweb soakaway design spreadsheet. Rising damp its control rising damp is not the most common form of dampness encountered in buildings.
Recommended options for most levels of exposure include blends of various types of portland cement. Concrete in the ground may be subject to attack by sulfates as described in bre digest 36391. Home publication index bre sd 1 concrete in aggressive ground. The procedures were also designed to meet the then current uk guidance notes, bre. Open access content subscribed content free content trial content. Increases the number of chemical tests required by the industry and as given by bre special digest 1 bre 2005 improves sampling and sample preparation and storing methods for sulfur species testing. Singleuser or company license, which one is the best for me. Site investigation designing buildings wiki share your construction industry knowledge. Bre bookshop supplies a wide range of building and construction related information products from bre and. Best practice guidance for energy management, auditing and controls these guides have been produced jointly with energy services and technology association esta and its members to represent best practice within the industry. Interim advice was issued in the report of the thaumasite expert group in january 1999. The majority of lowrise buildings in the uk are constructed using brick, concrete block or stone with mortar joints.
A guide to evaluation of human exposure to vibration is given in bs 6472 but is not considered here. Please contact the press office for the latest information. Consequently the requirement in digest 363 for aggregate concrete blocks to have 50% of the least crosssectional area to be carbonated for sulphate soil classifications ds2 and 3 has been replaced by a requirement for blocks. We also produce a number of longer textbooks and reference books, including the green guide to. The building research establishment bre has recently revised special digest 1 concrete in aggressive ground. The british building research establishment digest 363 july 1991 entitled sulphate and acid resistance of concrete in the ground is strongly. Bre building research establishment is an independent, researchbased consultancy, testing and training organisation, operating in the built environment and associated industries. National roads authority volume 4 section 2 design manual for roads and bridges part 8 nra hd 11815 march 2015 3 implementation 1. As the purchaser of a mezzanine floor you may not be aware that the government, due to persistent reports of failure in design and performance of mezzanine platforms, has just published its minimum design guidance for industrial platforms known as digest 437. Soakaway pit design can be a fairly complex task, particularly when there are restrictions on the size or depth of the soakaway and the details must be optimized. Clay fills, london, ice, proceedings of the conference held at the institution of civil engineers 1415 november 1978 bre building research establishment 1991 bre digest 363. The main change was the incorporation of bre information paper 102 3 introducing guidance in the application of metakaolin, silica fume and lithium salts with other minor editorial revisions. To minimise the effect of such attack requires the use ofsull%1te resisting portland cement or other materials, and the mix proportions should comply.
Volume 2 of the bre report efiahzt me of aggregates and bulk consctron matends. Full text of bre digest 436 part 1 wind load on buildings brief guidelines for using bs 6399 2 1997 see other formats wind loading on buildings brief guidance for using bs 63992. Six categories of crack were identified, which linked the width and number of cracks to the type of repair that was appropriate. It summarizes the guidance which is currently available in the uk and how it has been developed. Recycled aggregates crushed concrete and brick masonry have long. Since the late 1980s, however, deterioration of concrete as a result of the formation of thaumasite has become recognised as a separate form of. One of the recommended binder combinations is portland cement, blended at the mixer with fine fly ash essentially as defined in as 3582. A software package such as the civilweb soakaway design spreadsheet can assist with the soakaway pit design calculations and is essential if an optimal design is required. Bre bookshop each cd contains bre material published in the current year, including reports, specialist reports, and the professional development publications. It includes important advice on infiltration testing and soakaway design. Volume 3, repair, rejuvenation and enhancement of concrete. The civilweb soakaway design spreadsheet can be used to complete soakaway designs fully in accordance with bre digest 365.
Because these materials are often thought to be inferior to natural aggregates,they are. Soakaways have been the traditional way to dispose of stormwater from buildings and paved areas remote from a public sewer or watercourse. Fully working version where you can change the company information and logo in the top left corner. Bre digest 363 sulfate and acid resistance of concrete in the ground withdrawn special digest 1 concrete in aggressive ground 2001 and 2003 editions, withdrawn british standards institution bs 8500. Who should attend ground engineers concrete producers designers and specifiers of concrete for use below ground contractors as part of the seminar, the afternoon will consist of. Enhanced concrete quality an incremental step in concrete quality that could be used as an additional protective measure apm.
Sulphate and acid attack on concrete in ground and landfill. Damage to structures from groundborne vibration the. Please contact the press office for the latest information revision to concrete in aggressive ground guidance. Bre is a world leading, multidisciplinary, building science centre with a mission to improve buildings and infrastructure, through research and knowledge generation. Pdf the response of grandstands to dynamic crowd loads. In recent years, soakaways have been used within urban, fully sewered areas to limit the impact on discharge of new upstream building works and to avoid costs of sewer. Access to a pdf of this document is available by clicking through the links to the construction information service database and retrieving the document by searching for the title. Bre helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. Sd1, special digest 1, digest 363, dg363, concrete, precast concrete. Replaces bre sd 1 parts 14 2001 with amendments 2003, which replaced bre digests 363, 250 and 174. For classifying ground conditions for sulfate level in respect of design of buried concrete, the recommendations of sd1 should be followed. Approved document c, site preparation and resistance to contaminants and moisture, suggests that the extent and level of site investigations needs to be tailored to the type of development and the previous use of land. Bre digest 251 category of damage category crack width definition action 0 hairline 0.
487 118 1378 1318 978 53 898 73 182 444 1270 1158 116 1316 986 174 1150 369 688 1280 1299 740 1241 62 1004 1216 74 956 1333 787 1032 1334