No fines concrete backfill typically consists of cement fly ash water and coarse aggregate.
No fines concrete retaining walls.
No fines concrete exhibits less drying.
Advantages of no fines concrete.
Repeat procedure to the extent of wall height.
No fines concrete backfill can be used with any of the allan block retaining wall collections.
No fines concrete can also be applied to different projects aside from retaining walls.
No fines concrete can be used to construct a wall to a greater height than standard gravity wall construction methods.
The single sized coarse aggregates are surrounded and held together by a thin layer of cement paste giving strength of concrete.
These pre engineered tables provide an accurate estimate for geogrid reinforcement.
As damp proof material.
The no fines concrete by itself is a permeable concrete that is made by removing the fine aggregates in concrete.
Verify that the site condition of your retaining wall matches the table being used.
The compressive strength of no fines concrete varies between 4 mpa to 14 mpa.
No fines concrete is used to reinforced retaining walls where space is limited.
The depth of a retaining wall may also be increased with the use of no fines concrete.
With no fines permeable concrete the retaining wall blocks and concrete become one porous mass eliminating the need for costly rebar and geogrids which can demand a lot of excavation and backfilling.
Allan block retaining walls and no fines concrete no problem.
When using no fines concrete backfill the backfill zone will also serve as the required drainage or wall rock zone within the cores and directly behind the wall.
Proximity to future building foundations a contractor might begin with geogrid and transition to nfc at the top of the wall.
Woodland heights a 30 unit townhome association built in the 1980 s needed to replace its second timber retaining wall however numerous site constraints did not allow enough clearance to install geogrid reinforcement within the property limits.
Install each subsequent course in like manner.
Based on site constraints and project goals duffy engineering and associates.
Construction of small retaining wall.
Additional no fines concrete backfill pours can be made as soon as the additional block courses are placed.
To use the tables follow these simple steps.
No fines concrete backfill has little to no slump and exerts pressure on the soil and the retaining wall similar to loosely poured aggregate until cured.
The uses of this type of concrete are as follow.
No fines concrete can be a simple solution to a variety of challenges that a site might present.
The quantity of cementitious material is approximately 500 lb yd 297 kg m with a water cement ratio of approximately 0 30 0 40.
The advantages of this type of concrete are.
Construction of temporary structures.
Verify that the soil conditions at your site match the description.
Allow 2 3 hours for the no fines concrete to cure after a maximum of 4 ft 1 2 m of wall height.
Retaining wall geogrid and no fines concrete estimating charts.
