We have already learned about whisper concrete and its performances. After development this method in Belgium, no guidelines or specifications were not available for this exposed aggregate concrete finishing. After Belgium, many countries of this continent use this resurfacing method of providing skid resistance and noise reduction due to high speed vehicles. This method when used in United Kingdom, their also it becomes popular. But British engineers set guidelines to adopted whisper concrete.
First we recall the whisper concrete finishing procedure, to understand the changes were brought in British guidelines. We will discuss this in brief in few words. A 40-50 mm thick concrete layer is provided over smoothened concrete pavement having a coarse-aggregate size ranging from 6-8 mm. While the concrete is green a retarder mixture of glucose, alcohol and water is sprayed on it and covered with polythene sheet immediate after applying spray. After 8-36 hours, the sprayed surface is swept and using special bristle brushes, top 1.5-2 mm is removed to form an exposed aggregate surface, named whisper concrete.
Many advantages of this concrete are discussed here in previous post. We will go to this fact here to understand the changes or some additions in British guidelines. Austria is also worked much with this resurfacing concrete finishing. We will discuss British guidelines here. In the next post we will discuss about Austrian development in this regard.
British guidelines provide complete guidelines including sub-base foundation and main concrete pavement. The main concrete pavement is known as continuous reinforced concrete pavement (CRCP). Dear reader we will finish this topic in next post. Please stay with us we will provide complete guidelines for this silent traffic moving finishing.