Steel fiber castable is a refractory castable composed of refractory aggregate, binder and admixture, named after the addition of heat-resistant steel fiber of a certain size. It has the characteristics of high strength and toughness, good thermal shock resistance, good wear resistance, good construction performance, and shrinkage inhibition.
The maintenance and demoulding of steel fiber castables are key links in the construction process, which directly affect the strength development, crack resistance and subsequent use effect of the material. Various problems will be encountered in practical applications. What are the causes of the problems and how can we solve them?
|
Question Type |
Cause Analysis |
Solution |
|
Cracking during maintenance |
Insufficient moisturizing leads to dryness and shrinkage 2. Excessive temperature difference in the environment causes thermal stress |
1. Increase the frequency of watering and strengthen coverage 2. Shade at high temperatures and keep warm at low temperatures, control the temperature difference ≤15℃ |
|
Corners damaged during demoulding |
1. Demolding too early, insufficient strength; 2. Violent demolding and collision |
1. Extend the curing time and remove the mold after the strength reaches the standard 2. Use soft tools and tap and remove slowly |
|
Surface adhesive |
1. The template is not coated with release agent or is not cleaned properly; 2. The curing time is too long, resulting in excessive bonding |
1. Apply engine oil or silicone grease to the template 2. Demould at the specified time to avoid overtime |
|
Insufficient strength after curing |
1. The water-cement ratio is too large or the binder fails; 2. The curing temperature is too low, affecting hydration |
1. Strictly control the mix ratio and use fresh binder 2. Use steam curing in low temperature environment to ensure the temperature is ≥10℃ |
By systematically analyzing the causes of the problems and making targeted improvements, the construction quality of steel fiber castable can be effectively improved to ensure their excellent performance in high-temperature industrial environments.