钢纤维混凝土的压实抹平必需在砼初凝前竣事,概况收光要实时举行,****是在浇注完混凝土后举行,收光后的混凝土外貌不要暴露钢纤维。对付密筋梁的产物,应选用小直径振捣棒,而对付钢筋非常麋集的地方,要利用钢筋棍,可以更为密实。
The
compaction and leveling of steel fiber reinforced concrete must be
completed before the initial setting of the concrete, and the overall
polishing should be carried out in real time. * * * * is carried out
after pouring the concrete, and the appearance of the polished concrete
should not expose the steel fibers. To deal with the products of dense
reinforced beams, small diameter vibrating rods should be used, while
for places where the steel bars are very dense, steel bars should be
used to make them more compact.
钢纤维通常与混凝土混合,在混凝土中掺入钢纤维,可以大幅度提高混凝土的强度,使其具有较强的抗裂性能,一旦混凝土表面或内部出现裂缝,钢纤维就可以得到一定程度的控制,防止裂缝的膨胀,提高工程的抗冲击强度。钢纤维是指以切断细钢丝法、冷轧带钢剪切、钢锭铣削或钢水快速冷凝法制成长径比（纤维长度与其直径的比值,当纤维截面为非圆形时,采用换算等效截面圆面积的直径）为40～80的纤维。混凝土用钢纤维为使钢纤维较均匀地分散于砂浆或混凝土中,并增大纤维的长径比,可使用由水溶性胶粘结在一起成集束状的钢纤维。钢纤维可用冷拔钢丝切断、薄钢板剪切、钢块或钢锭铣削以及熔钢抽纱等方法制造。
无论是混凝土中的小裂缝,还是外部的大裂缝,钢纤维都可以起到很好的阻断作用,而且作用非常明显,这些裂缝很容易被钢纤维的作用所减少。但是如果没有钢纤维,这些小裂缝就可能成为混凝土的潜在威胁。
Steel
fibers are usually mixed with concrete, and adding steel fibers to
concrete can significantly improve its strength, giving it strong crack
resistance. Once cracks appear on the surface or inside of the concrete,
steel fibers can be controlled to a certain extent, preventing crack
expansion and improving the impact strength of the project. Steel fiber
refers to fibers with a length to diameter ratio (the ratio of fiber
length to diameter, converted to equivalent cross-sectional area when
the fiber section is non circular) of 40-80, which can be obtained by
cutting fine steel wires, cutting cold rolled strip steel, milling steel
ingots, or rapid condensation of molten steel. Steel fibers used in
concrete can be uniformly dispersed in mortar or concrete, and the
aspect ratio of the fibers can be increased. Steel fibers bonded
together with water-soluble adhesive can be used to form bundles. Steel
fibers can be manufactured using methods such as cold drawn steel wire
cutting, thin steel plate shearing, steel block or ingot milling, and
molten steel drawing. Whether it is small cracks in concrete or large
external cracks, steel fibers can have a good blocking effect, and the
effect is very obvious. These cracks are easily reduced by the action of
steel fibers. But without steel fibers, these small cracks could
potentially pose a threat to concrete.