《铁路混凝土强度检验评定标准》已批准发布《铁路混凝土强度检验评定标准》已经铁道部批准发布，自１９９４年４月１日起施行。新标准较原标准有以下几点显著不同：１．用＂混凝土强度等级＂代替沿用已久的混凝土标号；２．混凝土标准试件由原来的２０Ｏ×２００×２００... “Railway Concrete Strength Inspection and Evaluation Standards” has approved the release “Railway Concrete Strength Inspection Evaluation Standards” has been approved by the Ministry of Railways released since April 1, 1994 come into force. The new standard than the original standard has the following significant differences: 1. Use “concrete strength grade” instead of the long used concrete label; 2. Concrete standard specimen from the original 20O × 200 × 200 ...