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    分析引起环氧地坪基层裂缝的原因

    2019-02-02 22:13:34 无锡盛发地坪科技有限公司 阅读

    我们在进行环氧地坪施工的时候会遇到环氧地坪基层存在裂缝的情况,这些裂缝产生的原因是怎么样的呢?我们又该如何针对具体情况进行一些预防、处理呢?混凝土是一种由砂石骨料、水泥、水及其他外加材料混合而形成的非均质脆性材料。由于混凝土施工和本身变形、约束等一系列问题,硬化成型的混凝土中存在着众多的微孔隙、气穴和微裂缝,正是由于这些初始缺陷的存在才使混凝土呈现出一些非均质的特性。

    During the construction of epoxy flooring, we will encounter cracks in the base of epoxy flooring. What are the causes of these cracks? How can we prevent and deal with them? Concrete is a heterogeneous brittle material composed of aggregate, cement, water and other admixtures. Due to a series of problems such as concrete construction, deformation and restraint, there are many micro-voids, voids and micro-cracks in hardened concrete. It is precisely because of these initial defects that concrete presents some heterogeneous characteristics.

    对于工业厂房地面浇注的混凝土因需满足对效率及质量的要求,多采用商品混凝土,混凝土原材料质量控制、配合比计量控制以及混凝土搅拌、运送、泵送浇注的技术含量较高,尽管混凝土的养护也做到了尽善尽美,混凝土的裂缝却变成了不可避免的事,真可谓没有不裂的混凝土。

    As for the concrete poured on the ground of industrial factory buildings to meet the requirements of efficiency and quality, commercial concrete is mostly used. The quality control of concrete raw materials, the measurement control of mix proportion and the technical content of concrete mixing, transportation and pumping pouring are relatively high. Although the maintenance of concrete has been perfect, the cracks of concrete have become inevitable. There is cracked concrete.

    混凝土的裂缝已从特殊性转化为普遍性;从可以控制发展成不可控制,已成为混凝土质量的通病。这样一来对于环氧地坪涂装表面效果造成了极大的影响。

    Cracks in concrete have changed from particularity to universality, from controllable to uncontrollable, which has become a common problem of concrete quality. In this way, the surface effect of epoxy floor coating has been greatly affected.

    ⑴ 混凝土表面裂痕的原因包括:

    (1) The causes of cracks on concrete surface include:

    * 含水量的变化 * 温度

    * Change of Water Content*Temperature

    * 载荷及支承条件引起的变形 * 接缝处理

    * Deformation Caused by Load and Supporting Conditions*Joint Treatment

    所有这些原因主要源于混凝土内部的位移;若不做处理,表面裂缝将会进一步增加。虽然这种裂缝很少会影响到混凝土内部的结构整体性,但它影响外观。而且,可能还会导致其它问题和麻烦的发生(主要取决于裂缝的长短、宽窄、位移及变形)。

    All these reasons are mainly due to the displacement inside the concrete; if not treated, the surface cracks will further increase. Although this kind of crack seldom affects the integrity of the internal structure of concrete, it affects the appearance. Moreover, other problems and troubles may occur (mainly depending on the length, width, displacement and deformation of the crack).

    ① 细裂缝(网状、龟裂状)

    (1) Fine cracks (reticulate, tortoise-shaped)

    细裂缝发生在表面,呈规则或不规则的网络状。裂缝的深度一般不超过3mm,常见于硬结的金属镘抹表面或潮湿的表面。典型的裂缝呈六边型,通常在早期形成。虽然细裂缝不影响混凝土的结构整体性,不影响其耐久性和耐磨性,但它十分显眼,影响美观。

    Fine cracks occur on the surface, in a regular or irregular network. The depth of cracks is generally not more than 3 mm, which is common on hard metal trowel surface or wet surface. Typical cracks are hexagonal, usually formed in the early stage. Although the fine cracks do not affect the integrity of the concrete structure and its durability and wear resistance, they are very conspicuous and affect the beauty.

    ②塑性收缩开裂

    (2) Plastic shrinkage cracking

    这类裂缝出现在对新浇筑的混凝土表面作抹面处理时或抹面处理后不久。这种裂缝的间距一般大至1m,平行排列(或呈鸡爪状),深12mm,很少扩展至周边。与龟裂类似,塑性收缩裂纹很少会影响混凝土的强度,但影响美观。多数情况下,这种形式的开裂是由于表面水分的蒸发超过了表面水分的析出,当表面收缩时,内部的混凝土体积仍保持不变。

    Such cracks occur when new concrete surface is treated with plastering or shortly after plastering. This kind of crack is usually 1 m apart, arranged in parallel (or in chicken claw shape), 12 m m deep, and seldom extends to the periphery. Similar to tortoise cracks, plastic shrinkage cracks rarely affect the strength of concrete, but affect the beauty. In most cases, this form of cracking is due to the evaporation of surface water exceeding the precipitation of surface water. When the surface shrinks, the volume of internal concrete remains unchanged.

    ⑵ 混凝土温度应力深层裂缝和贯通裂缝同属结构破坏裂缝,表层修补基本作用不大,需从裂开基面彻底切开进行修补补强。

    (2) Both deep cracks and through cracks of concrete under thermal stress belong to structural damage cracks. Surface repair has little effect and needs to be repaired thoroughly from the cracked base surface.

    以上提到的三种裂缝形式,伸缩缝和施工缝是为满足混凝土应力变化而人为设置的,温度应力裂缝是由于混凝土本身应力变化而产生的。

    The three types of cracks mentioned above, expansion joints and construction joints are set up artificially to meet the change of concrete stress. Temperature stress cracks are caused by the change of concrete stress itself. 


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