You can use epoxy resin for concrete to repair, fill, bond, and rebuild concrete surfaces.
Epoxy bonding agents are one of the best options out there. They are known and highly rated for their strength and excellent performance. Epoxy bonding agents are not just for bonding old concrete to new, they can be used to help bond concrete to steel.
You can't use just any glue on a tough, porous material like concrete – you need a high-strength two-part epoxy glue for concrete.
The most effective way to ensure that the bonding agent gets into the existing concrete is to apply it directly using a brush or rag. It can be sprayed if you happen to have a sprayer. Although the directions say that you can use it as part of the mix water, direct application works better.
During repair work, use milling or grinding to reach hard concrete and then apply a bonding agent. Sand-cement and water-cement grouts are economical and practical adhesive agents that can be used for bonding hardened and fresh concrete. The sand-cement grout consists of 1 cement: 1 sand: ½ water.
Concrete is a composite material which is made up of a filler and a binder. The binder (cement paste) "glues" the filler together to form a synthetic conglomerate. The constituents used for the binder are cement and water, while the filler can be fine or coarse aggregate.
PVA Bonding Agent imparts excellent adhesion to cement and concrete; It allows a strong bond to be formed between cement and a variety of substrates and imparts excellent adhesion to concrete, enabling easy repair of concrete surface without the need for mechanical preparation of the surfaces.
Structural bonding agent between old and new concrete
Epoxy based, two component structural bonding agent. Sika® Hibond compiles with ASTM 881 – 87 Type II Grade 2 Class B and C. Once the two components of the material is mixed the material must be used within approx 4 hours.
If you pour a new layer over concrete right on top of the old one, you won't get proper adhesion. You must properly prepare your concrete slab and then apply a chemical bonding agent on top of it so your new concrete adheres properly.
As you say Bonding Coat is harder for a novice to flatten but can be easier to build up this thickness due to the set helping you out. However there is no reason why Sand & cement cannot be used - just apply diluted PVA (water, pva and a handful of sand mixed in to give an extra key) to the existing plaster.
A quick answer is yes! White vinegar can clean concrete and remove stains. It may not be as powerful as concrete cleaners, but it can clean up concrete stains on a budget. Not to mention that vinegar can also remove germs and bacteria from concrete.
Vegetable oils which contains a small amount of tall oil are superior concrete form release agents. Concrete release agents are applied to such solid surfaces as forms, pallets or any other surfaces which come into contact with fresh concrete.
Not only does it kill algae, but it eats away at polished cement if you leave it on the cement for too long. Vinegar can be used for longer periods on unfinished cement to remove algae, and it serves as an excellent cleaning agent. Vinegar is a natural and safe alternative to cleaning concrete with harsh chemicals.
Though it is possible to attach new concrete to old concrete, it is important to do it the right way to keep any cracks or separation from setting in too quickly. If you don't do everything possible to prevent that, you may be replacing the concrete sooner than you would like.
All varieties of the Original Gorilla Glue can adhere to concrete and brick. These products can dry in one of three different colors—light tan, white, and clear. The Original Gorilla Glue in light tan and white will take one to two hours to cure up to 80%. They will take around 24 hours to cure completely.
bondcrete as an admix: bondcrete 1 part water 10 parts is an ideal admix ratio for cement toppings, concrete, plasters etc. For estimating purposes 2 litres of bondcrete diluted with 20 litres of water is normally sufficient for mixing each 40 kg bag of cement.
BondCrete is so strong there is seldom any need to hack, chip or acid etch the surface before bonding. BondCrete is a concentrated high solid product, which in most cases provides a high dilution ratio, ensuring the customer gets value for money.
BondCrete in its undiluted form provides a ready to use, non toxic, non staining adhesive for carpentry, joinery and general craft work. BondCrete is so strong there is seldom any need to hack chip or acid etch the surfaces to be bonded eg. Concrete, bricks, tiles, plaster, stone, timber, ceramics, metal, fabric etc.
Although the terms cement and concrete often are used interchangeably, cement is actually an ingredient of concrete. Concrete is a mixture of aggregates and paste. The aggregates are sand and gravel or crushed stone; the paste is water and portland cement.
Vinegar and Baking Soda
Cleaning concrete with vinegar or baking soda is a good option if you are looking for a natural cleaner.
Despite the signal word danger on most such labels, gardeners may instead just see vinegar and be careless. Sobering details: In concentrations over 11%, acetic acid can burn skin and cause eye damage, and concentrations of 20% and above are corrosive to tin, aluminum, iron, and concrete and can even cause blindness.
Concrete does not adhere to: Concrete – Dried concrete doesn't have any natural bonding agents, so in order to get wet concrete to bond to existing concrete, a bonding agent will need to be used. Molds – Most concrete molds are made from urethane rubbers, which are designed to be resistant to concrete bonding.