BS EN 12716:2018 pdf download

BS EN 12716:2018 pdf download.Execution of special geotechnical work – Jet grouting
1 Scope
This document establishes general principles for the execution of jet grouting works.
NOTE The jet grouting processes is distinguished from the grouting processes covered by EN 12715.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements 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.
EN 197-1, Cement- Part 1: Composition, specifications and conformity criteria for common cements
EN 206, Concrete一Specification, performance, production and conformity
EN 480-4, Admixtures for concrete, mortar and grout- Test methods 一Part 4: Determination of bleeding of concrete
EN 934-4:2009，Admixtures for concrete, mortar and grout Part 4: Admixtures for grout for prestressing tendons一Definitions, requirements, conformity, marking and labelling
EN 1008, Mixing water for concrete一Specification for sampling, testing and assessing the suitability of water, including water recovered from processes in the concrete industry, as mixing water for concrete
EN 1997-1:2004, Eurocode 7: Geotechnical design一Part 1: General rules
EN 1997-2, Eurocode 7一Geotechnical design一Part 2: Ground investigation and testing
EN 12390-2, Testing hardened concrete – – Part 2: Making and curing specimens for strength tests
EN 12390-3, Testing hardened concrete一Part 3: Compressive strength of test specimens
EN 16228-1:2014, Drilling and foundation equipment一Safety 一Part 1: Common requirements
7.1.3 Wherever the borehole collars are located below the water table or artesian head, special measures shall be taken into account, in order to avoid piping through the boreholes.
7.1.4 The specified physical properties and geometry of jet grouted structures shall be defined in the design.
7.1.5 Site conditions which may influence the working sequence of the elements shall be specified.
7.1.6 When relevant, the detailed execution sequence should be shown on the printed or electronic execution drawings and/ or models.
7.1.7 Where no comparable previous experience is available representative preliminary field tests shall be carried out, using the equipment, materials and techniques proposed for the main jet grouting works.
7.1.8 To ensure a consistent result in the preliminary in situ test, at least one jet grouted element should be constructed with a given working procedure. In significantly heterogeneous ground conditions more test elements and different working procedures should be necessary for approval.
7.1.9 Where the jet grouted material is to be subjected to aggressive or temperature sensitive environment, the preliminary in situ tests should be preceded by specified laboratory tests on samples of the soil to be treated and the grout, mixed in proportions encompassing the working range
envisaged.
7.1.10 The determination of the characteristic material strength as part of the supervision, testing and monitoring shall be made by testing of samples, preferably of sample quality class A and B according to Annex B, taken from the jet grouting body itself either by core drilling, fresh sampling or from spoil return.