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在我单位一座营业大厅内,混凝土方柱及部分外墙面挂贴的大理石板块交付使用4年后,大理石板块与混凝土结合层有不同程度的开裂,在方柱拐角处裂缝更明显,有些甚至出现整块大理石松动,由于施工时挂有铜丝.才没有发生坠落。1995年重新装修肘,拆下大理石板块后才发现,大理石松动是由于混凝土表面隆起、崩裂造成的。裂缝呈放射状,有的长达150毫米,裂口高度比原平面高出2～5毫米。沿着裂缝敲开后发现,混凝土中为挂贴大理石预置的40毫米×3毫米扁铁严重锈蚀,锈蚀层呈片状,厚度可达4毫米.由于锈
In a business hall of our company, after the concrete slabs and some marble slabs attached to the external walls were put into use for 4 years, the marble plates and the concrete-bonded layer cracked to varying degrees, cracks were more pronounced at the corners of the square columns, and some were even There was looseness of the entire piece of marble, and there was no fall due to the copper wire hanging from the construction. The elbow was renovated in 1995. After removing the marble plate, it was discovered that the looseness of the marble was caused by the bulging and cracking of the concrete surface. The cracks are radial, some as long as 150 mm, and the height of the breach is 2-5 mm higher than the original plane. After knocking along the crack, it was found that the concrete 40 mm×3 mm flat iron preset in the concrete was severely rusted and the rust layer was flaky with a thickness of up to 4 mm.