混凝土质量通病的防止措施及处理方法（Prevention measures and treatment methods of common quality defects of concrete）.doc

混凝土质量通病的防止措施及处理方法（Prevention measures and treatment methods of common quality defects of concrete） Prevention measures and treatment methods of concrete quality problems In the modern construction, the construction is a complicated system engineering, construction preparation, construction organization, planning, quality control and handling need extensive, modern synthetically technology means, the effective control and management is the key to prevent the concrete quality problems produced by [1-4]. 1, cellular Cellular refers to the concrete structure of local Susong, mortar, stone and more less, the gap formed between the honeycomb like stone hole. The reason: one is the improper concrete mix, gravel, cement materials and water are not allowed, resulting in a small mortar, stone and more. Two is the concrete mixing time is not enough, not mix evenly, poor workability, vibrating imperfect. Three is the material or improper material is too high, not set on the stone Jane concentrated, resulting in stone and mortar segregation. The four is a layer of concrete is not material, vibrating false or leakage vibration or vibration time is not enough. The five is a template slot is not tight, the loss of cement slurry. Six is the use of reinforced dense gravel particle size is too large or too large slump. The seven is the foundation, columns, wall parts continue to sink without a little intermittent upper concrete. Preventive measures: careful design, strict control, always check with concrete, do accurate measurement, concrete mixing uniform, suitable slump, concrete cutting height of more than 2 m should be set on a tube or chute, water should be layered material, layered tamping, prevent leakage of vibration, the template should be tightly blocked, foundation, column, wall the Department should be in the lower Jiaowan, interval 1.0~1.5 h heavy after pouring concrete, to avoid the rotten neck. Processing method: small cell, first wash clean, with 2 or 1: 1: 2: 5 cement