BS EN 12390-12:2020 pdf free.Testing hardened concrete Determination of the carbonation resistance of concrete – – Accelerated carbonation method.
BS EN 12390-12 1 Scope This document quantifes the carbonation resistance of concrete using test conditions that accelerate the
rate of carbonation. After a period of preconditioning, the test is carried out under controlled exposure conditions using an increased level of carbon dioxide. NOTE The test performed under reference conditions takes a minimum of 112 days comprising a minimum
age of the specimen prior to curing under water of 28 days, a minimum preconditioning period of 14 days and an exposure period to increased carbon dioxide levels of 70 days. This procedure is not a method for the determination of carbonation depths in existing concrete structures. 2 Normative references The fllowing 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 12350-2, Testing fresh concrete一Part 2: Slump test EN 12350-3, Testing fresh concrete一Part 3: Vebe test EN 12350-4, Testing fresh concrete一Part 4: Degree of compactability
EN 12350-5, Testing fresh concrete一Part 5: Flow table test EN 12390-2, Testing hardened concrete – – Part 2: Making and curing specimens for strength tests 3 Terms and definitions For the purposes of this document, the fllowing terms and definitions apply.
ISo and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at hpt/wwwlecopeda.ora. IS0 Online browsing platform: available at ht:t/ww.w.ong/obp 3.1 carbonation rate average rate at which the carbonation front penetrates concrete expressed as mm/V (days) Note 1 to entry. The carbonation rate will vary depending upon the test curing. preconditioning or exposure conditions and therefore any carbonation rate has to be qualfied by the conditions under which It was obtainedl. The abbreviaton ‘Kac’ is the carbonation rate under the test conditions spectied in this document.
3.2 depth of carbonation depth as measured using a phenolphthalein solution or an alternative indicator that results in a colour
change in the range of pH 8 to pH 11 on the freshly-split concrete surface 3.3 effctive time time in days spent in the storage chamber with the concrete specimens continually exposed to carbon dioxide.BS EN 12390-12 pdf download.