1. grinding, grind down higher portion of the concrete so water can flow away. It won't be pretty because the color and pattern will be different in grinded away sections.
2. caping, build a concrete cap on top of old concrete. Usually it needs 2-3 inches.
3. lifting/jacking, drill holes on concrete to penetrate, and inject mud to relevel the concrete. This is used on old concrete that settled over the years. Is your porch old?
1) drain hole, 2) Drainage Channel, 3) re-direct the water
Some patio drainage problems can be solved by drilling small holes (about 3cm in diameter) in the existing surface and filling them with gravel. The holes will allow for the drainage of some excess water to solve the problem of standing water.
有什么办法解决？ 可以用Fast Setting Self-level Resurfacer 填充？要铺整个porch吗，还是低洼部分？
Porch 有点大，是 3ft X 19.5 ft
图在这里：
感觉雨槽下水管漏
1. grinding, grind down higher portion of the concrete so water can flow away. It won't be pretty because the color and pattern will be different in grinded away sections.
2. caping, build a concrete cap on top of old concrete. Usually it needs 2-3 inches.
3. lifting/jacking, drill holes on concrete to penetrate, and inject mud to relevel the concrete. This is used on old concrete that settled over the years. Is your porch old?
4. replacement, need I say more?
Some patio drainage problems can be solved by drilling small holes (about 3cm in diameter) in the existing surface and filling them with gravel. The holes will allow for the drainage of some excess water to solve the problem of standing water.
https://www.lowes.com/pd/Sakrete-Flo-Coat-40-lbs-Cement-Concrete-Patch/50327697
https://www.lowes.com/pd/Sakrete-Flo-Coat-40-lbs-Cement-Concrete-Patch/50327697
I think that's for cosmetics. But worth a try.
Bosch Daredevil 13/16 in. x 6 in. Spade Bit DSB1010 (homedepot.com)
注意要买outdoor 瓷砖，可以经受下雪天零下低温的，表面不滑的
老实话，干完那次就再不想碰水泥一类的东西，后来那个房子也卖了。
level：
https://www.lowes.com/pd/Sakrete-Fastset-Self-Leveling-Resurfacer-50-lb-Fast-Setting-Concrete-Mix/1000250711
coat：
https://www.lowes.com/pd/Sakrete-Flo-Coat-40-lbs-Cement-Concrete-Patch/50327697
当时我用的是普通水泥，和grout, 6x6 porcelain，spacers。要铺一层瓷砖是因为porch 表面出现地基裂缝，虽很细，不好看。