Allow 2 3 hours for the no fines concrete to cure after a maximum of 4 ft 1 2 m of wall height.
No fines concrete retaining walls.
Install each subsequent course in like manner.
Retaining wall geogrid and no fines concrete estimating charts.
As damp proof material.
Additional no fines concrete backfill pours can be made as soon as the additional block courses are placed.
Construction of external load bearing wall.
The uses of this type of concrete are as follow.
The advantages of this type of concrete are.
The compressive strength of no fines concrete varies between 4 mpa to 14 mpa.
Construction of temporary structures.
Allan block retaining walls and no fines concrete no problem.
Verify that the soil conditions at your site match the description.
3 5 additional construction notes.
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.
These pre engineered tables provide an accurate estimate for geogrid reinforcement.
Verify that the site condition of your retaining wall matches the table being used.
Proximity to future building foundations a contractor might begin with geogrid and transition to nfc at the top of the wall.
Construction of small retaining wall.
No fines concrete can also be applied to different projects aside from retaining walls.
Based on site constraints and project goals duffy engineering and associates.
To use the tables follow these simple steps.
Repeat procedure to the extent of wall height.
No fines concrete exhibits less drying.
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.
The single sized coarse aggregates are surrounded and held together by a thin layer of cement paste giving strength of concrete.
No fines concrete backfill typically consists of cement fly ash water and coarse aggregate.
No fines concrete is used to reinforced retaining walls where space is limited.
The no fines concrete by itself is a permeable concrete that is made by removing the fine aggregates in concrete.
No fines concrete backfill can be used with any of the allan block retaining wall collections.
No fines concrete can be used to construct a wall to a greater height than standard gravity wall construction methods.
Advantages of no fines concrete.
The quantity of cementitious material is approximately 500 lb yd 297 kg m with a water cement ratio of approximately 0 30 0 40.
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.
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.