Laboratory exposure systems to simulate atmospheric degradation of building stone under dry and wet deposition conditions

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Abstract

The design philosophy, construction and use of two exposure test systems are described, in which the objective is to simulate the degradation of stone samples under, respectively, the ‘dry’ and ‘wet’ deposition of atmospheric pollutants. Some element of realistic acceleration is possible in certain experiments. Particular emphasis is placed upon using known presentation rates of the pollutants, both in respect of typical depositions of pollutants and their oxidation products appropriate for an industrial atmosphere. In the dry deposition rig, SO2, NO2, NO, HCl and the oxidant O3 are presented individually or together at realistic deposition rates. In the wet deposition apparatus, SO2−4, NO3 and Cl at a pH of 3.5, simulating ‘acid rain’ but in a more concentrated form, are deposited. The dry deposition chamber can be operated at constant relative humidity (typically 84%) with pre-dried or precisely wetted stones to simulate episodic rain wetting, or using other methods of wet/dry cycling, which are also a feature of the wet deposition chamber. Heating and cooling of the samples is also possible, as is the use of shaped or coupled stones of different kinds such as are found in a building facade. The results are illustrated in terms of data on the weight change, the anion content of stone and run-off, the pH change of run-off and the total calcium reacted, using Portland stone, as a prelude to later papers in which behaviour of a whole matrix of stone types and environments is presented and discussed. Such an approach permits the eventual production of ‘pollutant-material response’ relationships and damage functions for comparison with and prediction of external exposure results.

References (34)

  • G Frohnsdorff et al.

    The meaning of durability and durability prediction

    Durability of Building Materials and Components, ASTM STP 691

    (1980)
  • F.H Haynie

    Deterioration of marble

    Durabil. Building Mat.

    (1988)
  • F.H Haynie et al.

    Effects of gaseous pollutants of materials—a chamber study

  • A.J Hutchinson et al.

    Degradation of stone building materials through combustion derived emission

    Report to British Coal

    (1990)
  • L.-G Johansson et al.

    Corrosion of calcareous stones in humid air containing SO2 and NO2

    Durabil. Building Mat.

    (1988)
  • O Lindquist et al.

    A case study on the deterioration of stone. The cathedral well (Domkyrkobrunnen) in Göteborg

    Durabil. Building Mat.

    (1988)
  • J Longhurst et al.

    Temporal and spatial variation of acidic deposition over Greater Manchester

    (1987)
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    Present address: Ciba-Geigy plc, Industrial Chemicals, Tenax Road, Trafford Park, Manchester, U.K.

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