ISO/TC 71/SC 7/WG 3 - Leakage due to Cracks

This document provides a guideline for the selection of a proper grout material to repair water leakage through cracks and other deformities in concrete structures. The factors relevant to the quality control of maintenance and repair of water-leakage cracks are as the following; a) conditions of water-leakage cracks; b) performance requirements for repair materials; c) different types of repair materials (grouts); d) procedures followed to select the appropriate repair materials; e) execution of different types of repair methods; f) performance assessments of applied materials and methods; g) data collection. This document does not include any details on the repair of dry cracks and the causes of cracks. The details on dry crack repair are covered in ISO 16311-4. A flow chart for maintenance of water-leakage cracks is shown in Figure 1.

ISO/TS 16774-5:2017 specifies a laboratory test method for evaluating watertightness of water-leakage crack repair materials through permeability testing. These permeability test procedures follow applied conditions outlined in different national testing parameters and requirements. As such, the results are only intended to provide a comparative performance evaluation of the waterproofing repair materials between different products of the same type of repair material. ISO/TS 16774-5:2017 outlines general guidelines and procedures for the test method. Specific variables that control the quantifiable parameters of the testing are filled in using relevant national standardizations and/or testing parameters.

ISO/TS 16774-6:2017 specifies a laboratory test method for evaluating the substrate (crack) movement response of water-leakage crack repair materials through permeability testing. The repair material injected into a test specimen with an artificial crack undergoes simulated movements normally caused by thermal expansion, settlement and vibrations in leakage cracks found in concrete structures under the applied conditions outlined in different national testing parameters that reflect different environmental conditions. As such, the results are only intended to provide a comparative performance evaluation of the waterproofing repair materials between different products of the same type of repair material. ISO/TS 16774-6:2017 outlines general guidelines and procedures for the test method. Specific variables that control the quantifiable parameters of the testing are filled in using relevant national standardizations and/or testing parameters.

ISO/TS 16774-1:2017 specifies a laboratory test method for evaluating the thermal stress resistance of water-leakage crack repair materials through permeability testing. The repair material injected into a test specimen with an artificial crack is thermally stressed under the applied temperature conditions outlined in different national testing parameters that reflect different environmental conditions. As such, the results are only intended to provide a comparative performance evaluation of the waterproofing repair materials between different products of the same type of repair material. ISO/TS 16774-1:2017 outlines general guidelines and procedures for the test method. Specific variables that control the quantifiable parameters of the testing are filled in using relevant national standardizations and/or testing parameters.

ISO/TS 16774:2016 specifies a laboratory test method for indirectly measuring the adhesion performance of repair material to wet concrete crack surfaces by qualitatively, as a pass/fail at predetermined time, against predetermined amount of weight exerted on the repair material adhesion. NOTE ISO/TS 16774-4:2016 classifies and categorizes materials that are tested into families of similar properties for the purpose of making relative comparisons with the data results.

ISO/TS 17774-2:2016 specifies a laboratory test method for the qualitative determination of the retention level of chemical resistance of repair materials in repaired cracks of concrete structures in conditions where the material is either underwater or in contact with water that may have various chemical components present.

ISO/TS 16774-3:2016 specifies a laboratory test method on the quantitative determination of repair material's performance and resistance against erosion and wash out due to underground water flow.