How to repair cement cracks in outer window sill

The cement on the window sill outside the house often cracks. So how can we repair it for him? We can adopt the following methods.

Solution: Scheme 1: Grouting reinforcement method:

Preconditions: fine cracks, few cracks and basically stable cracks.

Specific practice: make two or four test masonry columns with the same material. Divided into two groups, one group is first fractured by a press, then grouted, and then the failure tests of the two groups of masonry columns are compared. If the grouted masonry strength is basically the same as the original masonry strength, it is considered that the reinforcement is qualified. Cracks with a width of about 3.0mm can be filled; When the actual crack width is greater than 5.0mm, cement mortar can be used; When the cracks are small, pressure grouting can be used.

Solution 2: Embedding method

Prerequisite: the cracks are wide, but the number is small.

Specific practice: the mortar joint at the intersection of cracks can be filled with high-grade mortar and fine steel bars, or the embedded method can be adopted, that is, reinforced concrete wedges or hacksaws are used to reinforce the cracks at both ends and in the middle. Wedges or hacksaws can be as thick as the wall, or 1/2 or 1/3 of the wall thickness.

Scheme 3: Steel-reinforced pull rod method

Prerequisites: The wall will flash outward due to horizontal thrust, uneven settlement, expansion and contraction caused by temperature change and other reasons, resulting in large cracks in the wall or poor binding between the outer longitudinal wall and the inner transverse wall.

Specific practice: steel tie rods should be long and tied, and set along both sides of the wall. In the middle of the iron dragon rod, a bright blue screw should be added to tighten the pull rod, and the extension of the pull rod should be welded. The pull rod or pad nut exposed outside the wall can be properly treated before construction, and the pull rod and pad should be painted with antirust paint.

Scheme 4: Ring beam method.

Prerequisites: the wall is severely cracked. In order to increase the overall rigidity of the house,

Concrete practice: the strength grade of ring beam concrete is C 15-C20, and the section is at least 120× 180mm. Every 1.5-2.5m, supports (or bolts, anchors, etc. ) should be inserted into the wall and bound, and bear the weight of the ring beam. When pouring ring beam, the wall should be cut and watered to strengthen bonding.