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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The consequence of this adjustment will be to make the ground classification based on soil tests more conservative, eg some soils that were previously classified as DS-2 would now be considered as being DS The current and intended new limits for sulfate classes based on 2: 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.
It was concluded that the concrete had suffered attack despite it satisfying the recommendations of the then-current version of Digest in respect be Sulfates Class 3 ground conditions.
BS 1377 Part 3 Chemical Tests
These ball-park limits were converted in in BRE Digest to 2: 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 the thaumasite form of sulfate attack TSA in UK buildings and structures.
Development of guidance on classification of sulfate-bearing ground for concrete. In the majority of cases, the sd 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 occurrence of TSA.
Changes to sulfate classification The current and intended new limits for sulfate classes based on 2: BRE is a building science centre that generates new knowledge through research.
Design guides for common applications. Gives procedures for specification of concrete and applies to both buildings and civil engineering construction.
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SD 1 Concrete in aggressive ground. BRE helps its government and private sector clients meet the significant environmental, social and economic challenges they face in delivering homes, buildings and communities. This is used to create products, tools and standards that drive positive change across the built environment.
The new limits bring sulfate classification based on 2: Design guides for common applications incorporating March amendment No longer wd1 but cited in Building Regulations guidance. The Trust uses the profits made by the BRE companies to fund research and education that advances knowledge of the built environment.
The Amber document status indicator indicates that some caution is needed when using this document – it is either: Home Background to revision Key changes in SD1: Want access to British Standards? Key outcomes in respect of the mechanism of TSA and concrete specification have been:.
Assessing the aggressive chemical environment. Key outcomes in respect of the mechanism of TSA and concrete specification have been: In the early s, the thaumasite form of sulfate attack TSA became recognised as a separate mechanism affecting concrete in the UK.
As in the previous cases, the concrete contained carbonate-bearing aggregates. In all three cases the concrete contained carbonate-bearing limestone aggregates. Specifying concrete and additional protective measures incorporating March amendment No longer current but cited in Building Regulations guidance.
In the four years sincemuch of the research recommended by the TEG Report has been completed. The distinguishing features of this are that it.
SD 1 Concrete in aggressive ground. 3rd edition, BRE – Publication Index | NBS
Sv1 review of the historical background to sulfate assessment has thrown light on how the current discrepancy came about. The Red document status indicator indicates that the document is an old version The document has likely been withdrawn by the publisher, also the meta data presented here may be out of date as it is no longer being maintained by the editorial teams at NBS.
It also gave recommendations for se1 research on occurrence of TSA and mitigating measures. Again there may be more recent versions of the document. Assessing the aggressive chemical environment incorporating March amendment No longer current but cited in Building Regulations guidance. Together with other findings, such as deficiencies in guidance for ground assessment, the new knowledge has prompted the current major revision of SD1. This was published in as Special Digest 1: Dd1, in a new version of Digest was issued which drew attention to the risk of TSA in concretes containing internal calcium carbonate and promised further guidance based on on-going research.