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Does cement absorb water5/26/2023 The choice of the survey method is made at the stage of development of a site work execution program, while it is necessary to take into account the features and scope of application of a particular method, probable measurement error, it is also possible to use several methods in combination.Įpoxy thermosets are often exposed to high humidity environments in various applications, undergoing reversible and irreversible degradation depending on the environment. Conclusions: non-destructive quality control finds its application both in the construction of new facilities and in the inspection of existing buildings. Recommendations are given for planning the quality control of concrete structures at the stage of organizational and technological preparation of construction. Results: the results of the inspection of structures by the methods separation with spalling and the ultrasonic method of surface sounding are presented, the test conditions, basic requirements for correct data interpretation, and the necessary calculations are given. Materials and methods: the application of methods of non-destructive testing, separation with spalling and the ultrasonic method of surface sounding, is considered in detail. Purpose of the work: to conduct a comparative analysis of non-destructive testing methods, to consider a practical example of their application in the survey of a building being reconstructed, to identify the essential points of the organization of non-destructive quality control, which must be taken into account when developing a site work execution program. This paper discusses the main non-destructive quality control methods that are used in the inspection of both under construction and already existing concrete structures. The research showed that the pull-out tests provide an accurate assessment of strength directly in the structure. One of the most promising nondestructive test methods which can be applied for concrete quality testing in existing structures seems to be a pull-out method, particularly CAPO-TEST. Conclusions: the study considers European methods of concrete compressive strength assessment in construction structures. Independent methods of nondestructive testing are described. Test conditions, recommendations on specimen trimming, and main requirements for correct interpretation of the data obtained using elastic rebound and ultrasonic measurements are given. Results: the article presents a review of methods for concrete quality testing in finished construction projects following the European standards. Materials and methods: the article considers cut core testing methods, elastic rebound measuring, pull-out method, and ultrasonic velocity measurement. The study purpose is obtaining relevant information on concrete quality and structure, filler type and granularity, and seeking for answers to the following questions: is the tested concrete porous to what extent the carbonation is developing on the surface layer are there any defects in the structure. Although current European standards allow applying cut core testing for determination of actual structural condition with no restriction, they foresee that the given testing cannot replace concrete quality testing based on standard specimens taken by with the rules in effect. However, this statement is true in part only. Introduction: strength testing of cores cut from existing structures, as a rule, is believed the most reliable source of actual concrete quality information.
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