Brief introduction of concrete early strength agent
Keywords
Low temperature concrete, concrete early strength agent, magnesium sulfate, polycarboxylate superplasticizer, amorphous calcium aluminate
When concrete is poured, if its temperature is lower, its initial setting time and final setting time will be prolonged. Effects of low temperature conditions on concrete strength Low temperature conditions will reduce the hydration rate of cement, thereby affecting the strength development of concrete.
In order to cope with the impact of low temperature in winter on concrete construction, the concrete can be rapidly solidified and hardened in a low temperature environment; to prevent the concrete from failing in a subzero environment, it is necessary to add a concrete early strength agent.
Magnesium sulfate is a magnesium-containing compound with the molecular formula MgSO4, which is colorless or white crystal or powder, odorless, bitter in taste and deliquescence. The addition of magnesium sulfate in concrete can play a good early-strength effect and anti-freezing effect.
The magnesium ions in magnesium sulfate can react quickly with the hydroxide ions in the cement, thereby promoting the rapid setting of the cement and improving the early strength of the concrete.
In order to improve the overall strength and plasticity of concrete at low temperature, magnesium sulfate and polycarboxylate superplasticizer have good compatibility.
If it is necessary to improve the quick-setting effect of concrete in low temperature environment, amorphous calcium aluminate, magnesium sulfate and polycarboxylate superplasticizer can be used together.
