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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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.
BS 1377 Part 3 Chemical Tests
Home Background to revision Key changes in SD1: No field data would appear to have been available for brw with sulfate classes based on sulfate levels 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 were previously classified as DS-2 would now be considered as being DS This was published in as Special Digest 1: In particular, it can come from bicarbonate dissolved in groundwater.
The Amber document status indicator indicates that some caution is needed when using this document – it is either: Key outcomes ed1 respect nre the mechanism of TSA and concrete specification have been:.
Free to use BIM project management tool provides step-by-step help to define, manage and brr responsibility for information development and delivery at each stage of the asset life cycle in level 2 BIM projects. In the four years sincemuch of the research recommended by the TEG Report has been completed. Specifying concrete and additional protective measures incorporating March amendment No longer current but cited in Building Regulations guidance.
SD 1 Concrete in aggressive ground. Design guides for specific precast products. They were further changed in BRE Digest Design guides for specific precast products incorporating March amendment No longer current but cited in Building Regulations guidance. This is used to create products, tools and standards that drive positive change across the built environment. Key outcomes in respect of the mechanism of TSA and concrete specification have been: The distinguishing features of this are that it.
Want access to British Standards? It has long been known in the UK that concretes made with Portland cements are vulnerable to attack by sulfates in the ground. It was concluded that the concrete had suffered attack despite it satisfying the recommendations of the then-current version of Digest in respect of Sulfates Class 3 ground conditions.
It also gave recommendations for further brre on occurrence of TSA and mitigating measures. 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 occurrence of TSA.
BRE – Special Digest 1
In all three cases the concrete contained carbonate-bearing limestone aggregates. 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 of concrete in the ground, the first edition of which was published in Design guides for common applications incorporating March amendment No longer current but cited in Building Regulations bree.
These ball-park limits were converted in in BRE Digest to 2: Design guides for common applications. Provides guidance on the specification for concrete for installation in natural ground and in brownfield locations.
The procedures given for the ground assessment and concrete specification cover the fairly common occurrences of sulfates, sulfides and acids, s1 the more rarely occurring aggressive carbon dioxide found in some ground and surface waters, which affects concrete foundations and sub-structures.
Changes to sulfate classification The current and intended new limits for sulfate classes based on 2: Gives procedures for specification of concrete and applies to both buildings and civil engineering construction. A review of the historical background to sulfate assessment has thrown light on how the current discrepancy came about. Together with other findings, such as deficiencies in guidance for ground assessment, the new knowledge has prompted the current major revision of SD1.
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.
Development of guidance on classification of sulfate-bearing ground for concrete.