Phenomenon 1: Local lack of concrete surface rough paste, or a small pit, no exposed steel reinforcements. The reason: 1) template surface roughening or cleaning is not clean; 2) release agent brushing uneven or local leak brush; 3) the template joints loose stitching, slit pouring concrete slurry leakage. 4) vibration is not dense, concrete air bubbles remain in the bubble does not discharge a portion of the template surface. Patching scenarios: After the concrete surface well watered wet mortar with concrete grade will Pock smooth pressure light, the color is consistent. After the repair within 12 hours, water moisture conservation. Low partial concrete strength part, immediately remove and re-organize staff reinforced adjustment, formwork and pouring concrete, the template before pouring water wet. 2 phenomenon: A cavity within the concrete structure, no concrete local or cellular particularly large. The reason: 1) In the densely reinforced or reserved holes and embedded parts at the concrete pouring is not smooth; 2) out of order and construction technology construction serious operation, resulting in leakage vibration; 3) segregation of concrete, mortar separation, Dan Zicheng heap, or run pulp; 4) a cutting excessive vibration is not in place. Patching scenarios: The concrete around the loose and weak serous chiseled, rinse with water pressure, support is provided with trays template, moist after watering, a concrete structure with a high specific strength grade Semi hard fine stone concrete pouring carefully layered, powerful tamping, and conservation. Outstanding concrete structure surface, to be the strength of 50% and then chipped away, the surface with a 1: 2 cement mortar smooth
1, Pock: Phenomenon: Local lack of concrete surface rough paste, or a small pit, no exposed steel reinforcements. The reason: 1) template surface roughening or cleaning is not clean; 2) release agent brushing uneven or local leak brush; 3) the template joints loose stitching, slit pouring concrete slurry leakage. 4) vibration is not dense, concrete air bubbles remain in the bubble does not discharge a portion of the template surface. Prevention: 1) template surface clean, can not stick with dry cement and other hard objects; 2) before pouring concrete, application of water to wet the template, leaving no water, tight stitching template slit 3) brushing release agent shall be uniform, not leak brush. 4) Concrete shall be uniformly layered vibration compacting procedures, to prevent leakage of vibration, each concrete vibrator should be sent to bubble up. 2, the honeycomb: Phenomenon: Local crisp concrete, mortar less, more stones, and a gap appears between the stones to form a honeycomb of holes. The reason: 1) inaccurate or concrete mix aggregate measurement error; 2) concrete mixing time is short, there is no uniform mixing, poor workability of concrete, vibration is not dense; 3) pouring concrete, cutting a cutting excessive or improper no segment layered pouring, resulting in leakage of concrete vibration isolation; 4) does not block pores of the template is good or not firmly set template support, templates shift, resulting in serious leakage of slurry wall or rot.
