Xinxiang Hangwei Road Technology Co., Ltd. is a professional high-tech company dedicated to airport pavement maintenance. The company has accumulated many years of practical experience in pavement joint filling, repair, thread removal, marking, glue removal, weeding, enclosure and chamfering. The materials and equipment used by the company are all national patented technologies, and its excellent technology and service have been recognized and praised by many domestic airports. My answer to your question is as follows:
Corner damage is the fracture and spalling of concrete at the corners of the guide panel. The main causes of corner damage are:
A) When the cement concrete slab is poured and vibrated, the vibration around the formwork and the corners are leaked or vibrated falsely, resulting in insufficient corner strength;
B) After the mixture is vibrated and compacted, correct the position of the expansion joint plate to damage the concrete at the edge of the plate;
C) Cut the seam too early, and knock off the corner concrete;
D) When the joint is cut by false joint, the concrete will shrink and break from the cut joint, and the corner concrete will crack;
E) The "filled" concrete is poured too early, and the edge of the first concrete slab is damaged by the machine;
F) Remove and damage the corners of the concrete slab;
G) After form removal, corner maintenance cannot be guaranteed.
According to the analysis of the causes of corner damage of cement concrete pavement, in order to prevent corner damage, the following preventive measures can be taken during construction:
A) During construction, the corner parts must be vibrated compactly and evenly, and no vibration leakage is allowed to ensure the corner strength.
B) When expansion joints need to be set for continuous casting, expansion joint plates shall be placed with special mounting frames, and both sides of joints shall be vibrated at the same time during vibrating. When the position of expansion joint plate needs to be corrected, the loose mixture should be vibrated. Roof caving is strictly prohibited in expansion joints.
C) During construction, the timing of seam cutting should be grasped.
D) false seam should be cut to the end. If the template cannot be cut in place, it should be repaired in time after formwork removal.
E) Filling positions should be done sooner rather than later, and construction joints should be set at expansion joints as far as possible.
F) Dismantle the formwork prematurely, pry or smash it hard, and dismantle the formwork according to the requirements of operating procedures.
G) Pay attention to the moisturizing and curing of corners after form removal, and pay attention to protect them from bearing and compression.
I hope my answer is helpful to you!