Interpretation of Construction Technology in Construction Engineering Waterproof concrete construction 1 Range This technology standard is suitable for basement waterproofing of general civil and industrial buildings, and rigid waterproofing method is recommended; UEA shrinkage compensating concrete rigid waterproofing construction technology is recommended. 2 Construction preparation 2.1 Material and main machinery: 2.1.1 Cement: 425 Portland Cement, Ordinary Portland Cement or Slag Portland Cement are used. It is strictly forbidden to use expired, damped and deteriorated cement. 2.1.2 Sand: Medium sand should be used, and mud content should not exceed 3%. 2.1.3 Stone: Pebble should be used. The maximum particle size should not be greater than 40 mm, the mud content should not be greater than 1%, and the water absorption rate should not be more than 1.5%. 2.1.4 Water: Drinking water or natural clean water. 2.1.5 U.E.A Expansion Agent: Its performance should conform to the industry standard "Concrete Expansion Agent" (JC476-92), and its dosage should conform to the design requirements and relevant regulations. When mixed with other admixtures, it should be used after trial mixing. 2.1.6 Main machines and tools: concrete mixer, dump truck, trolley, vibrator, chute, barrel, iron plate, spade, bucket, calculating instrument scale, etc. 2.2 Operating conditions: 2.2.1 The upper working procedure of reinforcing steel bar and formwork is completed, and the procedures of hidden inspection and pre-inspection are handled.Attention should be paid to checking whether the iron wires and bolts of the fixed formwork pass through the concrete wall or not. If they must pass through, water-stop measures should be taken.Especially whether the pipeline or embedded parts have been waterproofed.The wooden formwork is watered and wetted in advance, and the debris falling in the formwork is cleaned up. 2.2.2 According to the construction plan, do a good job of technical disclosure. 2.2.3 Material needs to be tested and concrete mix proportion is put forward by laboratory test. The impermeability grade of concrete mix should be increased by 0.2 MPa according to the design requirements. 2.2.4 If the groundwater level is high, dewatering and drainage should be continued during the construction of underground waterproofing works. 3 Operation process 3.1 Technological process 3.2 Concrete mixing: Stirring feeding sequence: Dry mixing 0.5-1 min before feeding, and then water.When water is added three times, the mixing time is 1 to 2 minutes after adding water (0.5 minutes longer than that of ordinary concrete).Before mixing concrete, it must be strictly operated according to the mix proportion notice in the laboratory and may not be modified without authorization.Bulk cement, sand and stone trucks weigh too much. In rainy season, sand must measure water content every day and adjust water consumption.The slump of mixing and pumping concrete is controlled 6-8 cm and 14-16 cm respectively. 3.3 Transportation: The supply of concrete should be kept in a continuous and balanced way, and the interval should not exceed 1.5 hours. In summer or far distance, retarder can be properly added. Generally, 2.5 ~3 calcium lignosulfonate is suitable.If segregation occurs after transportation, mix twice before pouring. 3.4 Concrete pouring: Continuous pouring, no or less construction joints should be left. 3.4.1 The floor generally does not leave construction joints or post-pouring belts according to the design requirements. 3.4.2 If there are holes in the wall, the distance between the construction joints and the edge of the holes should not be less than 300 mm. The construction joints should be in the form of convex joints (wall thickness is greater than 30 cm), step joints, straight joints and metal water stoppers (wall thickness is less than 30 cm), and the construction joints should be made into entrance joints and treated with B.W water stoppers as vertical construction joints and post-pouring bands and deformation joints.Combination. 3.4.3 Before pouring concrete on construction joints, the surface of concrete should be chiseled, debris removed, washed and wetted, and then a layer of 2-3 cm thick cement mortar (i.e. removing stones from the original mix ratio) or reducing stones concrete with the same mix ratio should be laid. The first step of pouring is 40 cm in height, and the next step is 50-60 cm in height, which should be poured strictly in acco

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