セメント減水剤とは?

あ cement water reducer is a chemical admixture that decreases the amount of water used in concrete. この水分の減少により、コンクリートの水和速度が遅くなります。, giving it better strength and durability.

Low-range water reducers, also known as normal water reducers or regular plasticizers, typically lower the amount of water in a mix by 5 に 10%. These water reducers are often used in everyday concrete applications such as driveways, 歩道, そして地下室の壁.

Mid-range water reducers, also called plasticizers or intermediate plasticizers, typically lower the amount of concrete that needs to be mixed by 15 に 20%. These admixtures are often used in concrete for flatwork, such as driveways and sidewalks, because they reduce the water needed to produce a good-quality surface.

ハイレンジ減水器, also known to be superplasticizers or high range admixtures, are synthetic water-soluble organic compounds that decrease the amount of water in concrete by 25 に 30%. This results in a higher fluidity of the concrete, allowing it to flow better and provide more flexibility for placements.

These admixtures are usually added to the concrete mixture at a low dosage rate, although some high-range admixtures require a higher dose for optimal performance.

Most of these admixtures have no effect on the hydration of the cement, but some – like polycarboxylates – may increase air entrainment. This will vary depending on the chemistry of the admixture and its dosage rate. It is important to select the proper admixture for the application.