Construction joints refer to the joints formed between pre- and post-concrete concretes due to design requirements or construction needs to be poured in stages during the concrete placement process. Construction joints affect the quality of many factors, there are many treatment methods of construction joints, construction joints following Xiaobian briefly under the processing method it.
·A variety of factors that affect the quality of construction joints
(a) The reasons for engineering design drawings and construction processes, such as the construction joints remaining in the areas where stress concentration may occur; excessive or too little structural steel reinforcement or deviation from the shear area.
(b) Causes of concrete materials: Excessive concrete content of post-concrete gravel is too large; uneven aggregate distribution of aggregates, unreasonable types and amounts of cement; inappropriate selection of concrete mineral admixtures and admixtures, or failure to add as required The shrinkage of large concrete is not correct in construction; the concrete is poured at high altitude, the wind speed is too high, the sun exposure is prolonged, and the shrinkage value of concrete is increased, causing cracks in construction joints.
(3) Reasons for on-site construction: the vibrating method was not correct during construction; the loose concrete and stones were not removed in the construction joints; the dust was not clean; and the construction joint was not wet before the second concrete was re-cast; When the weather is hot, no protective measures lead to excessive water loss of the concrete too much; before the pouring of concrete, the debris and rubbish dropped into the joint are not checked and cleaned in a timely manner, resulting in the formation of a sandwich between the old and new concrete; the feeding method is improper and the aggregates are concentrated. At the bottom of the construction joint or at one place; no expansion or water proof steel plate was placed or incorrectly placed in the construction joints; no micro-expansion concrete was used, so that the joint parts could not be tightly connected.
(4) Construction site maintenance and environmental reasons: The newly-concrete concrete should be promptly taken protective measures such as maintenance, covering, wind blocking, etc. to prevent the concrete from losing water too quickly and the site template is not easily dismantled prematurely.
(5) The cracks caused by the construction joints due to the reasons for use are mainly due to uneven settlement of the structures; the use of loads exceeding the design requirements; the use of wild decoration, the removal of load-bearing walls or cut-off walls, beams, columns, etc.; environmental impacts, Erosion of structures by acids, alkalis, and salts causes accelerated aging and cracking of construction joints.
· Construction joint treatment method
Before continuing to pour concrete on the hardened concrete surface (requiring concrete strength up to 1.2 MPa), loose sand and weak concrete layers should be removed from the surface of the rubbish and cement film. The surface should also be cut. Rinse thoroughly with water and moisturize. The general wet time should not be less than 24h. Residues in coagulation.
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