Ability to reduce the effect of urban heat islands by using pervious concrete paving slabs

U diplomskom radu istražena je sposobnost smanjenja učinaka urbanih toplinskih otoka primjenom ploča za popločavanje od poroznog betona. Porozni beton svoj naziv duguje velikom udjelu pora koje su posljedica potpunog izostanka ili tek male prisutnosti sitnih čestica agregata u njegovom sastavu. Eksperimentalni dio rada obuhvaća izradu plošnih uzoraka od poroznog i običnog betona te dobave gotovih betonskih opločnika s tržišta. Na takvim uzorcima se prati njihova sposobnost apsorbiranja i otpuštanja topline u vremenu zagrijavanjem odnosno hlađenjem uzoraka i mjerenjem temperature u dvije točke poprečnog presjeka te međusobno uspoređuje. Rezultati ispitivanja pokazuju kako se porozni beton brže zagrijava i hladi nego ostala dva uzorka. Razlog tomu je što porozni beton ima veći prostor za skladištenje topline zbog svoje strukture, ali i zbog toga što porozna površina ima manju mogućnost reflektiranja svjetlosti.This paper investigates ability to reduce effects of urban heat islands by using pervious concrete paving slabs. Pervious concrete owes its name to a large proportion of pores which are the result of complete absence or only a small presence of small aggregate particles in its composition. The experimental part of the paper includes production of concrete paving flags of pervious and ordinary concrete. It also includes supplying of already produced concrete paving blocks from market. Such samples are being monitored and compared with each other for their ability to absorb and release heat over time by heating or cooling samples and measuring their temperature at two points in the cross-section. Results of this experiment show that pervious concrete heats and cools faster than other two samples. Reason for that result is because pervious concrete has a larger heat storage due to its structures, but also because the porous surface has less ability to reflect light