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The role of concrete early strength agent

Release time:

2022-04-25

Source:

Concreteearly strength agentThe main role is to improve the early strength of concrete, mainly refers to the compressive strength, but the late 28 days of concrete, the strength has no significant effect, may be slightly reduced. Early strength agent for winter or emergency construction.

Under the condition of keeping the slump of the benchmark concrete and the amount of cement unchanged, the dosage of 3-6% can reduce water by 5-12%, the early strength can be increased by 2.5 times, and the strength can reach 80-100% of the design strength in 7 days.

Concreteearly strength agentIt is one of the five earliest admixtures in history. Its main function is to speed up the hydration of cement and promote the development of early strength of concrete.

Currently commonly used in Chinaearly strength agentThere are chlorine, sulfate, carbonate and compound early strength agent. As an additive to promote the development of concrete early strength, concrete early strength agent is in great demand in engineering, especially in winter construction or repair projects.

1, the impact of concrete mix ratio.

　　early strength agentGenerally, it can shorten the setting time of concrete, but when the content of tricalcium aluminate in cement is low or lower than that of gypsum, sulfate will delay the setting time of cement.

　　early strength agentGenerally, the air content of concrete will not be increased. Early strong gas plasticizer is the content of air plasticizer. If sugar and calcium plasticizer are added, the air content does not increase, but if wood calcium plasticizer is added, the air content increases significantly.

2. Impact on concrete

Early strength agent can increase its early strength. It is related to the improvement degree of early strength agent, the dosage of early strength agent, ambient temperature, curing conditions, cement varieties, etc. The effect on the long-term strength of concrete is not consistent.

　　early strength agentIt has a good effect in a reasonable dosage range, but when the dosage is large, it will adversely affect the strength and durability of concrete in the later period.

Key words:

Early strength agent

The difference between early strength agent and accelerator

Introduction of early strength agent

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