This article will describe one of the systems for which a spray on concrete driveway can be installed. Each one has its own fair share of advantages and disadvantages. About 30 years ago, the only method existing for the application of resurfaced concrete driveways was through a dry-mix process. It continued as the dominant method used until the mid nineties, and then finally the wet-mix process began to be used more broadly. At present, the wet-mix process is being implemented all over the world as the chosen alternative, specifically for ground support works like driveways. Below is some information on the dry mix operation and some added explanations to the proper placement and application spread of this method.
The Dry Mix Installation of a Spray Concrete Driveway
With each method come some limitations. For the dry-mix method this means high costs of wear and tear on gaskets and friction discs on rotor machines. We should also take into consideration the environmental and safety impact of the high concentrations of dust which the method creates.
Next essential factor to consider in dry mix spray concrete driveways is the rebound. A rebound can be expected depending on the application surface to go beyond 15% and be as high as 35 or 40%. Normally, the range is 20 to 25%. Rebound can really go lower by using new kinds of additives and admixtures such as microsilica or the Delvocrete Hydration Control system. Average losses can be regulated into 15% in cases like this.
Another frequently mentioned setback of dry mix spray on concrete driveways is the low equipment performance. Presently, machines available are capable of more than 10 m³/hour, however, this cannot be done through manual application methods and needs a spraying manipulator. But, because of the increase in wear costs, outputs above 8 m³/hour, this becomes vital from an economical viewpoint. The usual output of between 4 and 6m3/hr must be maintained in order to be efficient.
In terms of quality control, the spray on concrete driveway material qualities produced by the dry-mix process have a bigger extent of inconsistencies because of insufficient mixing between the nozzle and the substrate, unknown and variable water-cement quantities, and sometimes too much water of the delivered concrete mix to the pumping machine.
Considering the aforementioned, it is clearer that a spray on concrete driveway operation formed by the dry-mix method is regarded as “temporary support” in the concrete industry but will suffice quite well in a residential setting.
Because of little knowledge when it comes to using the dry mix spray concrete driveway method for many years, now you can get a better idea on how to use it thoroughly. It is very essential that the materials, equipment and application techniques are chosen to provide for the most effective results in terms of quality and cost-effectiveness.
Even though the dry-mix spray concrete driveway process is an old method compared to other technologies and because of the continuous developments in equipment and material technology it’s possible to prolong this field of application continuously. Experts still expect that the dry spray on concrete driveway process will carry on playing an essential role for the residential market.
This will be applied mainly for projects with fairly small volumes and/or very flexible requirements such as concrete driveway repair, which is considered as the most marketable dry-mix spray on concrete process. In addition, long conveying distances fit the dry-mix process, and are therefore the process will be kept in use for the resurfacing of many concrete driveways everywhere.