In construction blinding typically refers to a base layer of weak concrete or sand that is laid above a layer of hardcore to provide a clean level and dry working surface.
Blinding concrete mixture.
Size of aggregates mm water for dry aggregates liter water for aggregates condition from dry to moist batch liter water for best consistency liter small precast work fence posts poles garden furniture and other work of very thin sections.
In lean concrete less quantity of paste is available for providing lubrication per unit surface of aggregate and hence the mobility of aggregate is restricted.
Assume to be 7 5n mm2 at 28 days.
As long as you re consistent you ll get a good strong mix.
The way you measure the ratio could be in shovels buckets or wheel barrows.
The purpose of this is to seal in underlying material and prevent dirt and mud from interfering with the structure.
An ideal concrete mix for floor blinding and kerb mix.
The basic requirements for the design of concrete mix ratio are.
2 meet the concrete peaceability.
3 meet the durability of the use of concrete.
4 meet the above conditions to save cement and reduce the cost of concrete.
It s made up of your normal ratio of cement mix aggregates and water.
20 newtons after 28 days.
The mix ratio of 1 2 3 consists of 1 part cement 2 parts sand and 3 parts stone plus some water to make a concrete mix you can use for most any building project.
People try to use finer aggregates for this purpose because of the thickness required.
A thin layer usually around 50 mm 2 inches thick of blinding is poured over the hardcore sealing in the underlying material and levelling off the surface.
This can be over the hardcore or over the foundation itself.
Lean concrete is a mix where the amount of cement is lower than the amount of liquid present in the strata.
Concrete at this strength is often applied on domestic floors and foundations where the weight of overall structures on the concrete will be lighter.
1 meet the strength grade of concrete design.
The four basic components should be mixed at the following guidelines in order to produce 3000 psi concrete.
C20 is ideal for domestic workshop and garage bases as well as driveways and.
One part portland cement three parts sand three parts aggregate and one part water.
It s usually done on site through hand mixtures.
The higher the aggregate cement ratio the leaner the concrete.
Blinding is the process of pouring a thin layer of concrete over the floor of a new building.
Concrete blinding is just 2 of regular concrete mix.
It is important to note that the water to cement ratio determines the strength of the substance.
