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Concrete admixture quality inspection
A, admixture product quality inspection, the determination of an admixture composition, performance and quality stability, to determine whether it reaches the specified physical and chemical performance indicators. Such as appearance, effective substance content, solubility, specific gravity, pH value of aqueous solution, chloride ion content, sulfate content, sugar content, foaming, surface tension and whether there is rust on the reinforcement.
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The performance role of concrete admixtures
Initially the use of admixtures, only to save cement, with the development of construction technology, admixtures have become the main measures to improve the performance of concrete.
Types of antifreeze and their mechanism of action
Antifreeze is an admixture that can make concrete harden under negative temperature and achieve sufficient antifreeze strength within a specified time. China's commonly used antifreeze agent is a multi-component composite, its main components are antifreeze components, water-reducing components, air-entraining components, early strength components.
How to use concrete admixtures correctly
At present, the variety of additives, the role of different in the concrete, including water reducing agent dosage is the largest, occupying a major position. The following is a personal experience of the application of water reducing agent.
Concrete admixtures so many, you are using the right?
Water reducing agent can maintain the concrete slump under the condition of unchanged, reduce the amount of mixing water to improve the fluidity of the concrete mix, or reduce the amount of cement per unit, saving cement. According to the water reducing agent water reducing capacity is divided into ordinary water reducing agent (also known as plasticizer, water reduction rate of not less than 8% ), high efficiency water reducing agent (also known as super plasticizer, water reduction rate of not less than 14% ) and high performance water reducing agent (water reduction rate of not less than 25%).