Scope
This document descnbes the method for determining the compatibility with concrete of polyurethane injection
products, or other elastic injection products likely to be sensitive to the effects of the alkalis in concrete. This
document describes the reference procedure.
In the case of polyurethane products, this method is only suitable for final injection products (i.e. not water-
foams).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including any
amendments) applies.
ISO 5893, Rubber and plastics test equipment-Tensile, flexural and compression types (constant rate of traverse)
Specifications
3
Test principle
This test investigates the effect of water contamination upon a polyurethane injection product,as might occur wh
the product is injected into water filled cracks in concrete. It then assesses the likelihood of change in flexibility of
the cured product as a result of long term contact with concrete.This is simulated by storing specimens in a
solution of caustic potash.These are then compared with control specimens of cured water contaminated product
which have been stored in air and similar specimens stored in water. A further set of control specimens is prepared
without water contamination and the cured products stored in air only. The specimens are cut from material
polymerised for seven days in shell moulds preventing an increase in volume.
4
General requirements
4.1
Apparatus
compression testing machine complying with ISO 5893;
mould for casting the product (see Figure 1);
sharp knife;
vessel to store specimens in caustic potash,
x,y recorder.
4.2 Materials
0,1 Molar solution of caustic potash (KOH);
the injection product.

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