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我厂的轨枕是采用华新525普硅水泥拌制的干硬性砼(W/C为0.3左右)和养护池蒸养工艺生产的,其颜色有时呈暗灰色。正常颜色为青灰色。颜色为暗灰色的制品,表面呈微孔状,有时有微裂纹,脱模强度明显下降,最大可达25%左右。通过观察和实践,发现颜色异常主要是砼密实成型后在室外静停时间过长使砼失水所造成的。因此干硬性砼在成型后要及时养护。倘若失误造成失水,从脱模颜色即可发
The sleeper of our factory is made of Huaxin 525 Pu silicon cement with hard and dry concrete (W/C is about 0.3) and the maintenance tank steaming process, and its color is sometimes dark gray. The normal color is grayish gray. The product is a dark gray product with micropores on the surface, sometimes with microcracks, and the demoulding strength is significantly reduced, up to about 25%. Through observation and practice, it was found that the color anomalies were mainly caused by dehydration of the alfalfa when the outdoor static stop time was too long after molding. Therefore, dry hard rakes should be promptly maintained after molding. If a mistake results in water loss, it can be made from the color of the mold release