Concrete floor for new grain store

[Forever Fendt]

Hi All.

Putting up a new grain store at the moment and looking at the floor.

Option 1. rc 35 with weld mesh over the whole store and entrance apron and columns tied in to floor with v shape rbar.

option 2. use rc35 with added fibre and just put sheet of weld mesh by each column and column tied in again with v shape rbar.

my main question is are we ok to use fibre in grain store concrete.

Cant find answer in red tractor guides, also called NFU callfirst and they did not know either. any help would be gratefully received.

\cheers

This is what we use and never had a problem 360 kg min cement content, straight op cement, water cement ratio 0.55, No WRA ,90 slump and 8mm mesh and would add poly fibres if the weather is warm and a chance of a breeze blowing across the slab to stop any plastic shrinkage cracking A warm breeze blowing over the top of fresh poured concrete is your enemy covering with plastic and a spray with water and leave on a few days is a good way to control curing

 

[Lincsman]

DO NOT USE FIBERS, a commercial store floor near me on the dock had to be ripped out after its first use as they were coming out of the floor and contaminating, its about a 1/4 acre area store!.

 

[B R C]

Do you really need mesh in grainstore. Maybe at front but rest doesn’t exactly get a lot of traffic?

 

[Forever Fendt]

Do you really need mesh in grainstore. Maybe at front but rest doesn’t exactly get a lot of traffic?

Yes as crack control whilst it drying out ,The 6mm mesh people use is crack control not for structural strengthening

 

[Farmerdunk]

Yes as crack control whilst it drying out ,The 6mm mesh people use is crack control not for structural strengthening

If mesh is not used would expect cracks to appear?

 

[Forever Fendt]

If mesh is not used would expect cracks to appear?

You would more than likely get to shrinkage cracking at the surface and in my opinion any form of cracking is bad in new concrete so I would not consider laying any concrete without some kind of reinforcement laying a new floor or yard is a considerable investment I can’t see why people want to skimp on a few pounds a square metre and risk having issues later on

 

[Jon 3085]

What would be the rough cost for a 80x60 shed floor be ? 6 inch thick complete job.

 

[Forever Fendt]

What would be the rough cost for a 80x60 shed floor be ? 6 inch thick complete job.

16k

 

[Farmerdunk]

You would more than likely get to shrinkage cracking at the surface and in my opinion any form of cracking is bad in new concrete so I would not consider laying any concrete without some kind of reinforcement laying a new floor or yard is a considerable investment I can’t see why people want to skimp on a few pounds a square metre and risk having issues later on

Like the original post, we have a grain shed going up, frame arrived this week. We hadn’t planned for mesh, but by most people views on here, they would recommend it. Cost of concrete for a 80x40?

 

[Spencer]

@FarmerBruce

 

[Surgery]

Don’t use a shite mix , pay more or you will have a Finnish you will regret every time you look at it

 

[Lincsman]

My contractor used a very runny nearly self leveling and certainly didnt need a poker, it said OS, which is over sand and 100 slump, it needs a lot of cement in it though so isnt cheap.

 

[Forever Fendt]

My contractor used a very runny nearly self leveling and certainly didnt need a poker, it said OS, which is over sand and 100 slump, it needs a lot of cement in it though so isnt cheap.

That’s the whole point of ordering a water cement ratio the wetter you order it the more cement it has to have and that is the reason for not having a WRA in the mix which is a water reducing agent thus you will get less cement

 

[Forever Fendt]

Don’t use a shite mix , pay more or you will have a Finnish you will regret every time you look at it

Exactly this, It is no good just calling your concrete supplier and asking for a C 45 concrete price they have many ways of achieving this with various additives and agents all designed to reduce cement content which is a bulk of their cost

 

[goodevans]

Exactly this, It is no good just calling your concrete supplier and asking for a C 45 concrete price they have many ways of achieving this with various additives and agents all designed to reduce cement content which is a bulk of their cost

Can volumetric mixers do the same thing or do they use less additives

 

[Lincsman]

Can volumetric mixers do the same thing or do they use less additives

In my experience they make up as the go along, its not for stuff you can see, doubt they give any warranty?

 

[Forever Fendt]

Can volumetric mixers do the same thing or do they use less additives

Volumetric mixes in my opinion have their place and uses but for a fairly big yard or floor I would not consider using one and normally the concrete from the volumetrics is more costly and there seems to be a lot more guesswork involved in producing the mix

 

[FarmerBruce]

@FarmerBruce

A bit of overkill here me thinks

 

[Spencer]

A bit of overkill here me thinks

Just thought could be of interest..

 

[Forever Fendt]

My contractor used a very runny nearly self leveling and certainly didnt need a poker, it said OS, which is over sand and 100 slump, it needs a lot of cement in it though so isnt cheap.

I would normally only expect an over sanded mix if the aggregate was angular maybe crushed limestone or similar we wouldn’t expect extra sand in a river type gravel