1.1 本试验方法将纤维增强混凝土面板的表面裂缝与对照混凝土面板的表面裂缝进行比较，对照混凝土面板在规定的约束和水分损失条件下的表面裂缝严重到足以在混凝土最终凝固前产生裂缝。 1.2 该试验方法可用于比较含纤维钢筋的不同混凝土混合物的塑性收缩开裂行为。 1.3 以国际单位制表示的数值应视为标准值。 本标准不包括其他计量单位。 1.4 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。 ( 警告- 新鲜的水硬性胶结混合物具有腐蚀性，长时间接触可能会导致皮肤和组织化学烧伤。 2. ) 1.5 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====== 5.1 本试验方法旨在评估蒸发、沉降和早期自收缩对纤维增强混凝土塑性收缩开裂性能的影响，直至最终凝固时间（见术语） C125 ). 5.2 从本试验中获得的测量值可用于比较不同混合比的混凝土、有纤维和无纤维的混凝土、含有不同数量不同类型纤维的混凝土以及含有不同数量和类型外加剂的混凝土的性能。为了进行有意义的比较，试验期间的蒸发条件应足以在对照试样中产生至少0.5 mm的平均裂纹宽度 ( 2. , 3. ) （参见 注释2 ). 此外，自由水面的蒸发率应在± 5. % 对于每个测试。 注2: 为了达到导致对照试样中出现至少0.5 mm裂纹的蒸发速率，可能需要使用高于中讨论的蒸发速率 注1 . 5.3 该方法试图控制大气变量，以量化给定新拌混凝土混合物的相对性能。由于许多其他变量（如水泥细度、骨料级配、骨料体积、搅拌程序、坍落度、含气量、混凝土温度和表面光洁度）也会影响潜在裂缝，因此应注意保持这些变量在不同混合物中尽可能一致。

1.1 This test method compares the surface cracking of fiber reinforced concrete panels with the surface cracking of control concrete panels subjected to prescribed conditions of restraint and moisture loss that are severe enough to produce cracking before final setting of the concrete. 1.2 This test method can be used to compare the plastic shrinkage cracking behavior of different concrete mixtures containing fiber reinforcement. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. ( Warning— fresh hydraulic cementitious mixtures are caustic and may cause chemical burns to skin and tissue upon prolonged exposure. 2 ) 1.5 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 ====== 5.1 The test method is intended to evaluate the effects of evaporation, settlement, and early autogenous shrinkage on the plastic shrinkage cracking performance of fiber reinforced concrete up to and for some hours beyond the time of final setting (see Terminology C125 ). 5.2 The measured values obtained from this test may be used to compare the performance of concretes with different mixture proportions, concretes with and without fibers, concretes containing various amounts of different types of fibers, and concretes containing various amounts and types of admixtures. For meaningful comparisons, the evaporative conditions during test shall be sufficient to produce an average crack width of at least 0.5 mm in the control specimens ( 2 , 3 ) (see Note 2 ). In addition, the evaporation rate from a free surface of water shall be within ± 5 % for each test. Note 2: To achieve evaporation rates that result in a crack of at least 0.5 mm in the control specimens, it may be necessary to use an evaporation rate higher than that discussed in Note 1 . 5.3 This method attempts to control atmospheric variables to quantify the relative performance of a given fresh concrete mixture. Since many other variables such as cement fineness, aggregate gradation, aggregate volume, mixing procedures, slump, air content, concrete temperature and surface finish can also influence potential cracking, attention shall be paid to keep these as consistent as possible from mixture to mixture.