Application of admixtures - Highway

In highway construction, the application of low alkali cement is of great significance to prevent the longitudinal cracking of concrete caused by "alkali aggregate reaction". However, low alkali cement may also collapse in construction, which requires us to allocate admixtures reasonably to ensure construction quality.

The raw material of low-alkali cement is mixed with blast furnace slag to reduce the basicity of cement. This kind of cement has high application value in expressway construction in specific areas. However, too high alkali content will cause serious damage to concrete, so the use of low-grade limestone, sandstone, alum slag and other raw materials to produce high-performance low-alkali cement, can ensure the alkali content at the same time, control the quality of the highway. The slump loss and water requirement of this cement are controllable, and the state of the concrete remains better controlled.

When solving the problem of low alkali cement collapse, we can refer to the design method of high performance concrete. Due to the low early strength of concrete, in addition to strictly controlling the ratio of concrete to cement, it is also necessary to make appropriate adjustments in the process of admixture configuration. Specifically, reinforcing agents and compacting materials can be appropriately added to supplement the strength and compactness of concrete.

Reinforcing agents can improve the compressive strength of concrete, so that it can withstand greater loads. The compacting agent can reduce the porosity of concrete, improve the compactness of concrete, and thus enhance its durability. Through the reasonable allocation of these two admixtures, we can effectively solve the problem of low alkali cement collapse and ensure the quality of highway construction.

In the implementation process, we need to conduct several tests and adjustments according to the specific situation to determine the best ratio of reinforcer and denser. At the same time, the construction process also needs to strictly monitor the performance indicators of concrete to ensure construction quality and safety.