POLYMER MODIFIED PERVIOUS CONCRETE

Porozni beton je posebna vrsta betona koja ima visoki udio šupljina. Zbog svoje karakteristične strukture ima nisku tlačnu čvrstoću, što ograničava njegovu primjenu. Najčešće se koristi za prometne površine s manjim prometnim opterećenjem. Cilj ovoga diplomskoga rada je ispitati utjecaj različitih polimera na svojstva poroznog betona. Rad se sastoji od dvije cjeline, prva obuhvaća teorijski dio, a druga eksperimentalni. U prvom, teorijskom dijelu opisana su bitna svojstva poroznog betona te njegove prednosti i nedostaci. Također, opisana su svojstva polimerom modificiranog betona, kao i neki od polimera koji će se koristiti u eksperimentalnom dijelu. U drugom dijelu prikazani su rezultati ispitivanja koja su provedena u laboratoriju Građevinskog fakulteta Osijek. Izrađeno je pet mješavina od kojih je jedna referentna dok su u ostale dodane različite vrste polimera s ciljem poboljšanja mehaničkih svojstava betona i rješavanja problema začepljivanja pora. Svi dodaci korišteni za modifikaciju su proizvođača Sika d.o.o. Lateks i polipropilenska vlakna su dodani u svrhu poboljšanja veze agregata i cementne paste što bi trebalo poboljšati mehanička svojstva betona. Cilj uranjanja dviju mješavina u vodoodbojnu impregnaciju je spriječiti prodor vlage u strukturu betona, a time i smanjiti prianjanje prljavštine na površinu betona kao i smanjiti začepljivanje pora tijekom vremena. Rezultati ispitivanja pokazuju da su polipropilenska vlakna pridonijela povećanju tlačne čvrstoće, čvrstoće na savijanje te propusnosti, dok su lateks i vodoodbojna impregnacija povećali samo tlačnu čvrstoću.Pervious concrete is a special type of concrete which has a high void ratio. Due to its characteristic structure, it has low compressive strenght, resulting in its limited application. It is commonly used for the construction of roads with low traffic load. The goal of this study is testing impact of various polymers to properties of pervious concrete. This study is composed of two parts, first part being theoretical and second experimental. First part describes pervious concrete properties and its advantages and disadvantages. Polymer modified concrete properties are also described as well as polymers themselves that were used in experimental part. Second part provides results of experiments conducted in the laboratory of the Faculty of Civil Engineering Osijek. Five mixtures of pervious concrete were prepared, a regular pervious concrete mixture as a reference mixture and four pervious concrete mixtures with different types of polymers added with the aim to improve mechanical properties and to solve problem of clogging in case of pervious concrete. Manufacturer Sika d.o.o. has provided all polymer additives used for experiments. Latex and polypropylene fibers were added to concrete mixtures with the aim to improve the interfacial zone between aggregate and cement paste which was expected to result in better mechanical properties of pervious concrete. The purpose of concrete specimens immersion in their hardened in water repellent impregnation was to prevent moisture penetration in concrete structure, and that to reduce dirt adhesion to surface of concrete as well to reduce pores clogging over time. Experiment results show that adding polypropylene fibers to mixture increases compressive strenght, flexural strenght and permeabillity of concrete, while adding latex and water repellent impregnation increases only compressive strenght