The Building Research Establishment (BRE) has recently revised Special Digest 1 “Concrete in aggressive ground”. This new edition (SD1. Find the most up-to-date version of BRE – SD1 at Engineering Provides guidance on the specification for concrete for installation in natural ground and in brownfield locations. The procedures given for the ground.
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Design guides for specific precast products incorporating March amendment No longer current but cited in Building Regulations guidance.
In particular, it can come from bicarbonate dissolved in groundwater. The Trust uses the profits made by the BRE companies to fund research and education that advances knowledge of the built environment.
The consequence of this adjustment will be to make the ground classification based on soil tests more conservative, eg some soils that hre previously classified as DS-2 would now be considered as being DS The Amber document status indicator indicates that some caution is needed when using this document – it is either: A review of the historical background to sulfate assessment has thrown light on how the current discrepancy came about. This was published in as Special Digest 1: The distinguishing features of this are that it.
Home Background to revision Key changes in SD1: Key outcomes in respect of the mechanism of TSA and concrete specification have been: The new limits bring sulfate classification based on 2: As in the previous br, the concrete contained carbonate-bearing aggregates.
BS 1377 Part 3 Chemical Tests
Document Status Indicators The Green document status indicator indicates that the document is: They were further changed in BRE Digest Design guides for common applications incorporating March amendment No longer current but cited in Building Regulations guidance. The change stems from findings of numerous research ground investigations carried out by BRE and others on BRE concrete trial sites and locations where TSA has occurred.
The current and intended new limits for sulfate classes based on 2: Guidance on designing concretes to resist conventional sulfate attack was developed in a series of BRE Digests, the most recent of which was Digest Sulfate and acid resistance brw concrete in the ground, the first edition of which was published in Assessing the aggressive sdd1 environment. Key outcomes in respect of the mechanism of TSA and concrete specification have been:.
SD 1 Concrete in aggressive ground. 3rd edition, BRE – Publication Index | NBS
Home Background to revision Key changes in SD1: Provides guidance on the specification for concrete for installation in natural ground and in brownfield locations. These ball-park limits were converted in in BRE Digest to 2: Changes to sulfate classification The current and intended new limits for sulfate classes based on 2: It also gave recommendations for further research on occurrence of TSA and mitigating measures.
BRE helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. The high profile of these cases ensured a co-ordinated national review, culminating in with a report from a Thaumasite Expert Group TEG set up by Government.
Design guides for specific precast products. BRE is a building science centre that generates new knowledge through research. In the four years sincemuch of the research recommended by the TEG Report has been completed.
Background to the revision One of the key drivers for revision of BRE Digests dealing with concrete in aggressive ground since the s has been a growing recognition of the occurrence sr1 thaumasite form of sulfate attack TSA in UK buildings and structures.
BRE – Special Digest 1
It is unfortunate that, through these changes, they gained an apparent precision that has imparted greater confidence in the derived classification than is warranted.
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Design guides for common applications. It was apparent that the Digest needed to be revised to counter the risk of Vre occurrence and, in particular, to take into account the contribution made by carbonates.
Want access to British Standards? Again there may be more recent versions of the document. In the majority of cases, the sulfate class limits based on soil extract tests were both lower than sulfate class based on sulfate in groundwater and were also low when compared to the actual hre of TSA. No field data would appear to have been available for correlation with sulfate classes based on sulfate levels in groundwater.
Development of guidance on classification of sulfate-bearing ground for concrete. In all three cases the concrete contained carbonate-bearing limestone aggregates.
Assessing the aggressive chemical environment incorporating March amendment No longer current but cited in Building Regulations guidance.