影響环氧地坪及混凝土密封固化劑的收縮因素

混凝土具有收縮的性質，而鋼筋並沒有這種性質，鋼筋的存在限制瞭混凝土的自由收縮，使混凝土受拉、鋼筋受壓，如果截面的配筋率較高時會導致混凝土開裂。造成混凝土密封固化劑环氧地坪的質量出問題。對於養護不好的混凝土構件，表面在受荷前可能產生收縮裂縫。需要說明，混凝土密封固化劑的收縮對處於完全自由狀態的構件，隻會引起構件的縮短而不開裂。對於周邊有約束而不能自由變形的構件，收縮會引起構件內混凝土產生拉應力，甚至會有裂縫產生。在不受約束的混凝土密封固化劑結構中，鋼筋和混凝土由於粘結力的作用，相互之間變形是協調的。
Concrete has the propert环氧地坪y of shrinkage, but steel bars do not have this property. The existence of steel bars restricts the free shrinkage of concrete, so that concrete tension, compression of steel bars, if the ratio of cross-section reinforcement is high will lead to concrete cracking. Cause the quality of concrete seal curing agent floor quality. For poorly cured concrete members, shrinkage cracks may occur on the surface before loading. It should be pointed out that the shrinkage of concrete sealant curing agent will only shorten the component without cracking when the component is in a completely free state. For the members with constraints around but not free deformation, shrinkage will cause tensile stress in the concrete, and even cracks. In the unconstrained concrete sealant structure, the deformation of steel bar and concrete is coordinated due to the bonding force.
混凝土密封硬化环氧地坪
Concrete seal hardened floor
混凝土密封固化劑幹燥失水是引起收縮的重要因素，所以構件的養護條件、使用环境的溫度及影響混凝土水分保持的因素，都對收縮有影響。使用环境的溫度越高、濕度越低，收縮越大。蒸汽養護的收縮值要小於常溫養護的收縮值，這是因為高溫沒濕可加快水化作用，減少混凝土密封固化劑的自由水分，加速瞭凝結與硬化的時間。通過試驗還表明，水泥用量越多、水灰比越大，收縮越大;骨料的級配好、彈性模量大，收縮小;構件的體積與表面積比值大時，收縮小。
The drying loss of water in concrete sealant is an important factor causing shrinkage, so the curing conditions of the components, the temperature of the service environment and the factors affecting the moisture retention of concrete have an impact on the shrinkage. The higher the temperature, the lower the humidity, the greater the shrinkage. The shrinkage value of steam curing is smaller than that of normal temperature curing, because high temperature humidity can accelerate hydration, reduce the free water content of concrete sealant cur印花地坪ing agent, and accelerate the time of setting and hardening. The test also shows that the more cement is used and the larger water cement ratio is, the larger shrinkage is; aggregate gradation is good, elastic modulus is big, shrinkage is small; and the shrinkage is small when the ratio of volume to surface area is large.