1 General Provisions
1.0.1 This code is developed in order to ensure the leading technology, safety, usability, economic rationality and the quality of cementitious grout during engineering design, construction and usage.
1.0.2 This code is applicable to the inspection and acceptance of cementitious grout application as well as the design, construction, quality control and engineering acceptance of grouting engineering.
1.0.3 In addition to meet the requirements of this code, the engineering to use cementitious grout shall also meet the provisions stated in current related national standards.
2 Terms
2.0.1 Cementitious grout
A kind of dry mixture with rational graduation and produced by cement, aggregate (or without aggregate), admixture and mineral according to industrialization progress; after it is watered and then mixed evenly, it characterizes pourable fluidity, light-expansion, high early stage, later strength and no bleeding
2.0.2 Baseplate grouting
The filling grouting carried out between the base-plate bottom surface of equipment or steel-structure column base and concrete foundation surface after anchor grouting for foundation bolt in order to achieve tight contact with base plate and uniform load transmission
2.0.3 Self-leveling grouting
The method of making use of the good fluidity and relying on the self-gravity of cementitious grout during the process of grouting to achieve grouting requirements
2.0.4 High-level funnel grouting
The method to make use of high-level funnel to improve potential energy difference to achieve grouting requirements when the grouting requirements can not be realized by the self-flow of cementitious grout during the grouting process
2.0.5 Pressure grouting
The method to adopt grouting supercharging equipment during the grouting of cementitious grout so as to meet grouting requirements
2.0.6 Early age expansion
Volume expansion generated after watering and mixing of cementitious grout and which lasts initial setting
2.0.7 Post-hardening expansion
The volume expansion generated along with expansible hydrated product generation during the setting and hardening of cementitious grout
2.0.8 Combination expansion
With both early age expansion and post-hardening expansion simultaneously
3 Basic Requirements
3.0.1 Cementitious grout is applicable to foundation bolt anchorage, the grouting of equipment foundation or steel-structure column-base plate, the reinforcement/ reconstruction of concrete structure as well as the opening grouting of post-tensioning prestressed concrete structure.
3.0.2 During the design of cementitious grout usage materials shall be selected according to those factors such as strength requirements, environment temperature during equipment operation, grout layer thickness, the clear distance between foundation bolt surface and hole wall, construction environment temperature and curing measures. Cementitious grout shall be provided with working-environment-temperature range, construction-environment temperature range and corresponding performance indexes offered by the manufacturer.
3.0.3 The quality of water for mixing cementitious grout shall meet the provisions in current national standard "Standard of Water for Concrete" JGJ 63. During construction, cementitious grout shall be mixed according to the water consumption required by product; while it is not allowed to improve the fluidity by increasing water consumption.
3.0.4 During the usage of cementitious grout, measures shall be taken to prevent operation personnel inhaling harmful dust and avoid environmental pollution.
GB/T 50448-2008 The following standards are cited：
