Chapter 8
Mixing, Placing and Curing Concrete
コンクリートの混合
The primary goal of mixing concrete is to stir its ingredients, ensuring the aggregates are evenly coated with cement paste, resulting in a uniform ...
ミキシングタイム
Concrete mixers are initially charged with 10 percent of the total water, followed by consistent additions of solid materials and 80 percent of the total ...
レディーミクストコンクリート
Concrete that is prepared at a centralized facility and then delivered to the job site in trucks, ready for placement, is known as ready-mixed or ...
ポンプコンクリート
Concrete can be transported through pipelines over long distances to be placed in locations difficult to access, such as deep foundation pits.
The system ...
コンクリートの打設
Concrete should be placed close to its final position in uniform horizontal layers.
After laying, the concrete layer is fully compacted to expel the ...
振動コンクリート
Mechanical vibrators are used to compact freshly placed concrete in forms and around the reinforcement to expel the entrapped air and form a dense ...
吹付けコンクリート
Shotcrete involves spraying mortar or small aggregate concrete rich in mortar through a hose at high velocity onto a surface that is typically
...
Preplaced 骨材コンクリート
Preplaced aggregate concrete is produced by initially placing gap-graded coarse aggregate that is sufficiently wet within the formwork and compacting it.
...
仕上げコンクリート
After consolidating the placed concrete, excess material is removed from the surface and flushed with the formwork's top using a screed.
Subsequently, ...
コンクリートの養生
Cement hydration occurs in the water-filled capillary pores of cement paste.
Environmental factors like air temperature, humidity, and wind can cause ...
硬化方法
Oiling and moistening forms before pouring concrete aid in curing concrete members with a small surface-to-volume ratio.
These forms may be left in place ...
コンクリートの硬化促進
Concrete curing is accelerated by applying heat and adding moisture, yielding concrete with higher early strength.
Steam curing, often used for precast ...
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