Book Description

THIS PUBLICATION HAS BEEN ARCHIVED.

Whilst this publication can still be purchased some of the information in it has been superseded by more recent research and standards. The BRE Group does not accept any responsibility whatsoever for any loss or damage, including - without limitation - indirect or consequential loss or damage arising from use, or loss of use, of data or profits arising out of, or in connection with, the use of this document.


Please note that this Information Paper relates to the 2006 edition of the associated report. BR488 has now been superseded by BR509, published in 2009.

Since the 1970s, many disused mine workings have been successfully stabilised by filling with grouts based on pulverized-fuel ash (pfa) and Portland cement. However, concerns have been expressed over the potential for contamination of controlled groundwaters by bleed water and leachate released from pfa grout, disruption and dust arising from the work, the effect on land and property prices, and the risk of classification of the land above the workings as contaminated.

This Information Paper summarises new guidance on the selection of environmentally compatible and cost-effective materials and techniques, published in a detailed BRE report (BR488). It is based on information in the literature, laboratory studies at BRE, data from the use of pfa grouts and expertise from an industry steering group. 4 pages.

Contents:
Introduction
Pfa production and use
Potential contamination of groundwater
Overall assessment methodology
Risk assessment
Assessment and characterisation of the site
Assessment of material properties
Engineered measures for minimising contamination of controlled groundwater
Guidance on site practice
Guidance on environmental monitoring during and after filling
Assessment of other risks associated with the use of pfa grouts
References