1.1 这些试验方法旨在评估水泥浆、砂浆和混凝土材料的耐化学性。该方法松散地基于测试方法 C267 然而，该解决方案的定义更为严格，并使用了弯曲强度。这些试验方法用于测定试样暴露于介质后，试样和试验介质的以下特性的变化: 1.1.1 试样质量， 1.1.2 试样外观， 1.1.3 测试介质的外观，以及 1.1.4 试样强度。 1.2 指导 C1894 提供了混凝土产品微生物引起腐蚀的标准指南。本标准用于评估水泥制品的耐多氯联苯引起的酸侵蚀性； 然而，如MICC产品指南文件所述，当前文件仅适用于腐蚀的第三阶段。本文件并非全面评估MICC或评估用于降低MICC的抗菌添加剂的功效的指导性文件。 1.3 本标准补充了试验方法 C267 提高MICC或其他来源产生的酸的报告结果的一致性。 1.4 本标准不包括通过细菌活性实现酸化的试验。指南中描述了细菌活性的测试协议 C1894 . 1.5 以国际单位制表示的数值应视为标准值。 括号中给出的值是到替代单位（通常为英寸-磅单位）的数学转换，这些单位仅供参考，不被视为标准。 1.6 本标准并非旨在解决与其使用相关的所有安全问题（如有）。本标准的用户有责任在使用前制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认标准化原则制定的。 ====意义和用途====== 4.1 如指南中所述 C1894 ，MICC被认为是一个三阶段过程，pH值降低（第一阶段）（例如，12.5>pH>9-10），建立生物膜，进一步降低pH值（第二阶段）（例如，9-10>pH>4-6），并最终因生物酸暴露而恶化（第三阶段）（例如，pH<4）。本文件提供了评估第3阶段酸对混凝土影响的标准试验方法。 4.2 如指南中所述 C1894 在指定混凝土时，应非常小心地进行酸浸试验，因为这是劣化的最后阶段，混凝土可能不会暴露在本试验的条件下。 4.3 通过这些试验方法获得的结果应作为选择特定应用的耐化学性材料的指南，而不是唯一依据。未试图将可能影响材料实际使用性能的所有各种因素纳入本试验方法中。

1.1 These test methods are intended to evaluate the chemical resistance of cement paste, mortar and concrete materials. This method is loosely based on Test Methods C267 , however the solution is more rigorously defined and flexural strength is used. These test methods provide for the determination of changes in the following properties of the test specimens and test medium after exposure of the specimens to the medium: 1.1.1 Mass of specimen, 1.1.2 Appearance of specimen, 1.1.3 Appearance of test medium, and 1.1.4 Strength of specimens. 1.2 Guide C1894 provides a standard guide for Microbially Induced Corrosion of Concrete (MICC) products. This standard is used for assessing the chemical resistance of cementitious products to acid attack caused by MICC; however as described in the guideline document for MICC products the current document only applies for Stage III of corrosion. This document is not intended to be a guideline document for the complete evaluation of MICC or for assessing the efficacy of antimicrobial additives used to reduce MICC. 1.3 This standard supplements Test Methods C267 to improve the consistency of reported results for acids generated by MICC or other sources. 1.4 This standard does not cover tests in which acidification is achieved by bacterial activity. Testing protocols for bacterial activity are described in Guide C1894 . 1.5 The values stated in SI units are to be regarded as standard. The values given in parentheses are mathematical conversions to alternative units (typically inch-pound units) that are provided for information only and are not considered standard. 1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 4.1 As described in Guide C1894 , the MICC is considered to be a three-stage process with the reduction in pH (Stage I) (for example, 12.5 > pH > 9-10), the establishment of biofilms which further lowers the pH (Stage II) (for example, 9-10 > pH > 4-6) and eventual deterioration due to biogenic acid exposure (Stage III) (for example, < ~4 pH). This document provides standard test methods to assess the effects of acid in Stage 3 for concrete. 4.2 As described in Guide C1894 , acid immersion testing should be used with great caution in specifying concrete as this is a final stage of deterioration and the concrete may not be exposed to the conditions of this test. 4.3 The results obtained by these test methods should serve as a guide in, but not as the sole basis for, selection of a chemical-resistant material for a particular application. No attempt has been made to incorporate into this test method all the various factors that may affect the performance of a material when subjected to actual service.