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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.
Commonly used cement and admixtures for drilling
In drilling construction, cement is needed to reinforce the orifice pipe and water stop casing, and also often encounter complex problems such as collapse, leakage, and broken off blocks of the formation, which require cement for wall protection and plugging. However, due to the low early strength of ordinary cement, setting time is too long, the slurry liquidity is poor, it is necessary to use cement additives to improve and adjust a variety of cement properties, the use of cement additives to improve and adjust the performance of certain cements is an effective way. For example, to improve the early strength is appropriate to use early strength admixture; to shorten the setting time, then use rapid setting agent; if you need to improve the fluidity, to use drag reducing agent and so on.
The influence of concrete admixture amount and mixing process
The optimal amount of concrete admixture admixture should be determined by the recommended amount, use requirements, construction conditions, raw materials and other factors through testing. Use requirements refer to the requirements of the project, such as early strength or slow setting, saving cement or improving performance, etc.