Effekt av Idrocrete KR 1000 på betongporestruktur og permeabilitet (Effect of Idrocrete WP 1000 on concrete pore structure and permeability)

Abstract

This thesis includes a literature study where the focus is concrete theory and how additives affect the durability of the concrete. In addition, there will be a practical part where the largest part of the task will undergo mainly on the concrete laboratory. Two different mixtures will be mixed. A reference mixture (Ref.B35) and another mixtue with the same recipe, but this will contain an additive from Mapei (Idrocrete KR 1000). Primarily, the focus is on the concrete's pore structure, which affects the permeability. Permeability can be defined as the ability of a material to pass through a substance. Testing and measuring the idrocrete KR 1000, and how it affects concrete proves to be necessary to compare and to see if the manufacturer's opinion about the product is correct. It is important that construction materials meet requirements for both strength and durability. Damage to concrete construction costs a lot of money annually to repair / build. Introducing the right products into the market that can help reduce costs and environmental impact can be very beneficial to the community. In this thesis, all results are going to be compared with the theory described in the literature section, technical description from Mapei and conversation and information provided by Dan Arve Juvik (Concrete industry Nordic and Baltic). Through capillary suction, some physical characteristics have been uncovered which provide a better basis for evaluating the resistance-related properties of concrete. Here Idrocrete KR 1000 showed some interesting values. When it comes to compressive strength, we get unexpected results. Based on the results, it does not contribute positively to solidarity development. According to concrete technology, concrete with fewer pores must have better compressive strength than concrete with more pore. But in our case the teori does not quite apply. The reason why the concrete tests give these results is not yet clear. In capillary suction test, the concrete with Idrocrete KR 1000 added to it seems to have more closed porestructure. This means we get a low porosity concrete. When comparing the the teoretical and the practical data (lab), we see that we get the expected results which are positive to the concrete technology. Through experiment, it turns out that Idrocrete KR1000 has the ability to reduce capillary pore proportion. Something that leads to less water/chloride suction.