Cement additives are used to change the cement's density, setting time, compressive strength, flow properties and dehydration rate, to cause the cement to expand, and to reduce the cost of the cement.
The changeofstrength with loading rate is primarily due to the variation of cohesion with loading rate.
且强度变化主要是由于粘聚力随加载速率变化引起的。
3
It shows that after adding 20% low profile additive to the UP resin, the shrinkage rateof cured resin is 2.1%, the retention rateof bending strength is 88% and no change in flexural modulus.