Paweł Szymański

Impact Of Moisture Conditions On Early Shrinkage Of Ordinary Concrete With Changing W/C Ratio

Abstract Article presents the results of the effect of humidity on early shrinkage of normal concrete with variable W/C ratio. As known for a long time, shrinkage is dependent of many factors. One of them is the W/C ratio and the quantity of water which is located in the concrete mix. In article there were discussed changes taking place in the concrete mix, the methods of research and the partial results obtained by the authors of the paper. Shrinkage is a phenomenon well known and studied by various research centers. The total amount of shrinkage may depend on various factors such as humidity, temperature, composition of the concrete mix, the W/C ratio, the size of the item. The study was conducted to determine the amount of shrinkage in its early stages. It is very important for concrete floors contractors, precast manufacturers to start at the right time finishing work and prevent the formation of shrinkage cracks.

Multi-criteria certification of buildings in Poland

The certification of green buildings has become more and more popular as a tool used for comparison and evaluation of newly built structures. The authors of this article analyse various certification systems of green buildings in Poland with particular interest paid to newly built multiand one-family residential buildings. The reason there is such little interest in green building certification processes is also considered. Additionally, the major constraints behind introducing green building certificates for newly built structures is also presented. The Article also presents an analysis of benefits resulting from green building certification for investors, contractors and final users of a particular building.