Dry powder reinforcing agent is an additive used in building materials such as concrete and cement, which can improve the strength, durability and stability of materials. Usually include silicate reinforcement, calcium-based reinforcement and organic reinforcement and other types. The silicate reinforcing agent can enhance the early and long-term strength, durability and impermeability of concrete and cement; the calcium-based reinforcing agent can promote the reaction of cement and increase its strength and durability; the organic reinforcing agent can improve the ductility of concrete and cement Performance and durability, reducing problems such as cracking and cracking.
Testing performance and standards
The following are the main properties that need to be tested for dry powder enhancers and the corresponding testing methods:
| performance | Test items | Detection method |
|---|---|---|
| strength enhancement | Compressive strength, tensile strength, flexural strength | GB/T 17671, GB/T 50081, GB/T 50082 |
| Durability | Permeability, abrasion resistance, weather resistance | GB/T 50082, GB/T 50083, GB/T 50208 |
| stability | Expansion rate, shrinkage rate, hardening time | GB/T 50119, GB/T 17671, GB/T 50081 |
In addition, according to different types of dry powder reinforcing agents, other specific properties may also need to be tested, such as calcium-based reinforcing agents, which need to be tested for their promotion of cement reaction.
Detection method
The following are the main properties and corresponding detection methods that need to be tested for dry powder enhancers:
Strength Enhancement:
The compressive strength, tensile strength and flexural strength can be measured by conventional mechanical test methods. Among them, GB/T 17671 "Cement Strength Test Method" is a commonly used compressive strength test method; GB/T 50081 "Standards for Test Methods of Mechanical Properties of Reinforced Concrete" and GB/T 50082 "Standards for Test Methods of Mechanical Properties of Concrete" are It is a method for determining tensile strength and flexural strength.
Durability:
Impermeability, abrasion resistance and weather resistance are three important durability properties of dry powder reinforcement. The impermeability can be evaluated by hydraulic test, such as the membrane penetration test method in GB/T 50082; the abrasion resistance can be tested by an abrasion Tester, such as the concrete abrasion resistance test method specified in GB/T 50083 ; Weather resistance needs to be evaluated by long-term exposure tests in natural or artificial climate environments.
stability:
The stability of dry powder reinforcement includes expansion rate, shrinkage rate and hardening time. The expansion rate and shrinkage rate can be tested by the expansion and contraction test method in GB/T 50119, and the hardening time can be measured by various methods, such as compaction test method, mesoscopic analysis method, etc.
In addition to the detection methods listed above, specific detection methods may be required for different types of dry powder reinforcing agents. For example, calcium-based reinforcing agents need to be tested for their promotion of cement reaction. Therefore, the detection method needs to be selected according to the specific type of dry powder enhancer.
