Recommendations of bre digest 363 regarding classification of severity of sulphate conditions, and appropriate concrete specifications are given. The base of the trial hole should be approximately the same depth as anticipated in the full size soakaway. Please contact the press office for the latest information revision to concrete in aggressive ground guidance. Fire safety group oakroyd hall birkenshaw west yorkshire. Digest 363 building research establishment, sulphate and acid resistance of concrete in the ground, bre digest 363, crc press, boca raton, 1996 and. Replaces bre sd 1 parts 14 2001 with amendments 2003, which replaced bre digests 363, 250 and 174. The digital geographic information exchange standard digest. There is evidence of old movement in the structure, where the heads and sills in the rear window openings have distorted. All references to annexes a, b, c or d in this clause refer to digest part 2. Bre building research establishment is an independent, researchbased consultancy, testing and training organisation, operating in the built environment and associated industries. Abstract provides guidance on the specification for concrete for installation in natural ground and in brownfield locations. It therefore became apparent that the digest needed to be revised to take account of the risk of tsa occurrence. The guidance on the use of aggregate concrete blocks in sulphate soil conditions which was first introduced into the bre digest 363.
Bre digest 363 sulfate and acid resistance of concrete in the ground withdrawn special digest 1 concrete in aggressive ground 2001 and 2003 editions, withdrawn british standards institution bs 8500. Concrete durability and repair, concrete, materials bre. Bre digest dg498 selecting lighting controls by paul littlefair updated edition. The latest edition, published on 24 february 2016 was written by. In spite of these procedures, problems still arise from time to time on highway schemes and other civil engineering works due to corrosion caused by sulfur compounds. 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. This part of bs 5328 refers to bre digest 363 1, which has superseded bre digest 250, for guidance on sulfate and acid resistance of concrete in natural ground consideration is given in this standard to the type of construction in addition to the concentration of sulfate. Many of the ways in which cracking can be produced in buildings are discussed in digests 359 and 361.
Materials in situ concretecement concrete testing special subject areas damagedeteriorationcorrosion thaumasite publisher history. Opening address professor l a clark obe, freng professor of. The highways agency 5 will issue an amendment to highways agency manual of. If chemical reaction appears to be the cause, samples of material for laboratory testing should be taken. Complementary british standard to bs en 2061 bs en 2061. Manual of contract documents for highway works volume. 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. 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. This is used to create products, tools and standards that drive positive change across the built environment.
Bre digest 329, 1993, installing wall ties in existing construction 10 pull out tests shall be carried out on site to prove the suitability of the tie system adopted. This percolation test follows the procedures laid out by the bre digest 365. Bre is the uk s leading centre of expertise for construction, the built environment, sustainability, energy, fire and many associated issues. Sulphate and acid resistance of concrete in the ground. There is a pdf version of this title available as an instant download here.
Bre digest 365 soakaway design designing buildings wiki. Specification of aggregates from natural sources for concrete. Article the significance of cracks in lowrise buildings. This is not a new phenomenon and has been experienced many times in the past. Because these materials are often thought to be inferior to natural aggregates,they are. Bre is owned by the bre trust, a registered charity no. Sd1, special digest 1, digest 363, dg363, concrete, precast concrete, aggressive ground, brownfield land, chemical. The cba research work supports the bre statement that surface carbonation enhances sulphate resistance. Bre is the uks leading centre of expertise on the built environment, construction, sustainability, energy, fire and many associated issues. Concrete and concrete products in aggressive ground a successor to the present bre digest 363.
Dryzone express replastering system 36 part 4b replastering system no. 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. The building research establishment bre has recently revised special digest 1 concrete in aggressive ground. The majority of lowrise buildings in the uk are constructed using brick, concrete block or stone with mortar joints. Home forms i 363, request to enforce affidavit of financial support and intent to petition for legal custody for public law 97359 amerasian. 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. The water rises through the pores capillaries in the masonry by a process loosely termed capillarity.
The mixes contain various carbonatecontaining aggregates together with a range of cement. Full text of bre digest 436 part 1 wind load on buildings. Site investigation designing buildings wiki share your construction industry knowledge. Thermal imaging also revealed a detail that wasnt visible with the naked eye, this being cavity construction, this explained why there wasnt any high readings in. 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. Structuralmechanical factors vibration special subject areas building failures publisher history. 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. The bre 365 method does not include a variable factor of safety. Draft new documents including bsi documents and bre digest proposed for. Apr 01, 2015 below is bre digest 245 rising damp in walls diagnosis and treatment we drilled 2 profiles in this property, in the picture below the 2nd profile is in the rectangular box. On a recent highway scheme in england, severe corrosion was found in corrugated steel buried structures. Use in sulphate soil conditions concrete block association.
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. 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. It replaces the 2003 edition and has been revised to reflect new thinking and changes to british standards. Diagnosis and treatment investigations have revealed many instances in which systems intended to combat rising damp have been installed in buildings where rising damp is not occurring. Dig 366 structural appraisal of existing buildings for change. Sulphate and acid attack on concrete in ground and landfill. Bre digest 365 civilweb soakaway design spreadsheet. Sulfate specification for structural backfills trl. A survey to bre digest 245, rising damp in walls diagnosis. For the purpose of all digest encapsulations a byte is defined to be an 8bit octet. If, after admission to the united states, the beneficiary of a petition for a public law 97359 amerasian requires enforcement of the guarantee of financial support and intent to petition for legal custody, which was executed by the beneficiarys sponsor, the beneficiary may file this form with uscis.
Bre is a world leading, multidisciplinary, building science centre with a mission to improve buildings and infrastructure, through research and knowledge generation. If using the civilweb soakaway design spreadsheet the factor of safety value can be set at 1 to conform to the bre 365 method. Code of practice for the installation of remedial wall. Pdf gypsum waste reduction through stabilization for. Contact bre for information about its services, or for technical advice. Part 3, 1980 withdrawn 4 bre digest 251, assessment of damage in lowrise buildings, 1995. In the early 1990s, the thaumasite form of sulfate attack tsa became recognised as a separate mechanism affecting concrete in the uk. The approach to structural appraisal of an existing building is fundamentally different from that taken in designing the structure of a proposed building.
When purchased online this publication will be supplied printed from a pdf file. Bre digest 251 category of damage category crack width definition action 0 hairline 0. 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. Design of soakaways volume 4 section 2 part 8 nra hd 11815 march 2015 st.
The digital geographic information exchange standard. Bre digest 363, bs 5328 and bs 882, and through discussions with the. We provide research, consultancy, information and testing services to customers worldwide. Home publication index bre dig 366 structural appraisal of existing buildings for change of use. One of the many causes of damage is foundation movement resulting especially from the drying shrinkage of clay subsoil.
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. Damage to structures from groundborne vibration the. Background to the revision one of the key drivers for revision of bre digests dealing with concrete in aggressive ground since the 1990s has been a growing recognition of the occurrence the thaumasite form of sulfate attack tsa in uk buildings and structures. Building research establishment information paper ip 882 increasing the fire resistance of existing timber doors. Below is bre digest 245 rising damp in walls diagnosis and treatment we drilled 2 profiles in this property, in the picture below the 2nd profile is in the rectangular box. Bre special digest sd1 provides guidance on concrete in aggressive ground replaces bre digest 363 published in 2001 in 4 parts includes guidance on special products such as precast concrete pipes second edition in 2003 updates to bs en 1971. The bre digest 365 method includes a number of specific design conditions and assumptions which must be considered, including the following. Recycled aggregates crushed concrete and brick masonry have long been used in the uk and overseas construction industries. Assessing the risk of sulfate attack on concrete in the ground links the data given in the 15year report br 164 on a study of the sulfate resistance of concrete with recommendations in the revised bre digest 363 on the use of concrete in sulfate soils and groundwaters. Dig 366 structural appraisal of existing buildings for. Timber research and development association wood information sheet 2. Accordingly a new version of digest 363 was issued in january 1996 which drew attention to the risk of tsa in concretes containing internal calcium 1, 1. Chemical resistance of stanton bonna concrete drainage. Systems may choose to map basic numerical data types to internal structures that may or may not be of equivalent.
Bre is a building science centre that generates new knowledge through research. In many cases, the fire authority asks for an element of structure to have a minimum period. However, due to a lack of suitable specifications, there has. Bre digest 365 soakaway design was first published in 1991, when it replaced digest 151. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. The chemical resistance of stanton bonna concrete drainage products may therefore be classified as follows. The reporting and implementation of the findings of an appraisal for change of use are outlined. This digest explains the differences and describes a practical sequence for carrying out such an appraisal. Opening address professor l a clark obe, freng professor. Parts 14 2001 with amendments 2003, which replaced bre digests 363, 250 and 174. Remedial wall ties shall be tested in compliance with the specification of bre digest 401. Current approach and research needs dr ewan a byars centre for cement and concrete university of sheffield this paper discusses the current approach taken in bre special digest 1 to the specification of concrete for thaumasite attack resistance, with respect to the lessons learned from the.
Extract from table 1 bre digest 251 classification of damage based upon crack widths 4. Mezzanine and raised storage 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. Code of practice for the installation of remedial wallties. Increasing the fire resistance of existing timber floors. The possible sinking of boreholes and plumb and level surveys bre, 1995. Either way, you can t really do wrong 20080414 00 12 69,120 c windows system32 wlanapi.
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