The Diagnosis of Alkali-Silica Reaction

Books & Publications test will show the effect of the high concentrations of chloride on the performance of the repair. Some 200 programmes of research This Information Paper will interest currently being carried out by the engineers with responsibility for carryBuilding Research Establishment are ing out materials evaluation, and also described in the new BRE Research to specifiers and engineers seeking Programme 1988/89. The work is tests of performance criteria against classified under the five principal which to judge currently marketed groups comprising BRE - Environ- concrete repair materials. IP 11/88 is ment and Energy - Fire Research available from Publication Sales, Station - Geotechnics and Structures Building Research Establishment, Group - Materials Group - Applications Garston, Watford WD2 7JR, price £1 Group. Each section is sub.divided (post free but minimum order £3). into the divisions making up that group making a total of 18 separate areas of activity. In each subject a brief outline of the work being undertaken is given together with the staff The D i a g n o s i s of Alkali-Silica Reaction responsible and the resources planned for each item of work. Copies of the BRE Research The report emphasises that damage Programme are available free of cannot be attributed to ASR from a charge from Publication Sales, visual inspection alone. Site inspecBuilding Research Establishment, tions have to be supported by laborGarston, Watford WD2 7JR. atory tests and accurate diagnosis may be neither easy nor straightforward. The 36-page publication contains a general introduction and deals with EVALUATION OF REPAIRS TO site inspection, sampling, laboratory REINFORCED CONCRETE IN investigation and assessment of the MARINE CONDITIONS results. Advice is also given on forecasting the possible developThe Building Research Establishments of ASR when the diagnosis is ment has developed a unique method positive. of testing the performance of conPriced at £5.00 the report is availcrete repair materials used on reinable from Publications Distribution, forced concrete in marine conditions. British Cement Association, Wexham This new test is based on 10 years of Springs, Slough SI_3 6PL Tel: Fulmer BRE experiments on concrete repair 02816 2727 quoting ref. 45.042. materials in a marine environment. Details of the design, manufacture and use of the reinforced concrete PATCHING RECONSTITUTED test specimen are given in a new BRE STONE Information Paper IP 11/88 'A method for evaulation of repairs to reinforced Advice on the specification and concrete in marine conditions'. Damage to such structures may preparation of patch repairs to reconoccur either due to impact or cor- stituted stone components is available in two new Defect Action Sheets from rosion of the reinforcement. The BRE test uses conditions the Building Research Establishment. similar to those in which the repair BRE advice is that local repairs h materials may be exposed and can reconstituted stone non-structural therefore be related to likely perfor- components can be patched with mance in service. In particular, the ordinary Portland cement mortar BRE RESEARCH PROGRAMME PUBLISHED

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p[ovided simple rules are followed to avoid shrinkage cracking and loss of adhesion to mortar. Reconstituted stone can be subject to local frost damage or to cracking and spaUing following corrosion of reinforcement so there is often need to undertake individual patch repairs to delay further deterioration. Copies of DAS 122, 'Windows and doors: reconstituted stone non-structural components; 'plastic' repair using Portland cement mortar specification' and DAS 123 'Windows and doors; reconstituted stone nonstructural components; 'plastic' repair using Portland cement mortar on site' are available from Publications Sales, Building Research Establishment, Garston, Warlord, WD2 7dR price 75p each (post flee but minimum order £3).

WIND LOADING GUIDE FOR ROOFS

The Single Ply Roofing Association (SPRA), representing all the major UK manufacturers and suppliers of single ply roofing membranes and associated accessory materials, have published a comprehensive Booklet entitled "Guide for the Assessment of Wind Loads Acting on Roofs". This contains a considerable amount of technical information relating to the use of single ply polymeric waterproofing membranes, in designing and installing such membranes to withstand the effects of wind uplift forces. Specific information, involving formulae and supported by tabular, graphic and pictorial matter, should prove of interest to architects, structural engineers and contractors involved in flat roofing. The guide is now available by sending a cheque or postal order for £5.75, made payable to "The Single Ply Roofing Association", to: Mr C Fisher, Keith Dixon Associates, De Montfort House, 67 Leicester Road, Hinckley, Leicestershire LE10 1LP.

CONSTRUCTION & BUILDING MATERIALS Vol. 3 No. 2 JUNE 1989