Study of Properties of Fresh and Hardened Pervious Concrete and its Durability

Abstract

The main objective of the project was to determine the compressive strength, durability and the properties of the pervious concrete keeping in mind of the materials used in the preparation of the concrete mix. Finding the correct mix proportion for the making of the pervious concrete is an important factor to be considered. Firstly, we determined the materials used and the mix design of pervious concretes per IS 10262-2009 for the mix proportion to calculate its compressive strength of not less than 25 MPa. The aggregates that we have used are single sized angular aggregates with different sizes of aggregate. We also made sure that the aggregates were washed thoroughly until all the sand particles were removed. Aggregate tests like Impact test, Los Angeles abrasion test, Crushing Value test, specific gravity test and water absorption test were done. Cubes of 10*10*10 cm cubes were being casted. Before mixing the concrete, proper dry mixing of cement and aggregate was done to get a fine even mix before the water was added. The moulds were fixed properly closing all the joints tightly and leaving no space in between in order to prevent bleeding of concrete. The concrete was casted and kept for 24 hours. Then the concrete was de-moulded after 24 hours. After 7 days and 28 days of curing, the concretes were tested for compressive strength. Infiltration rate was found using ASTMc1701 for both first and second trial pervious concretes. An infiltration ring was temporarily sealed over the surface of pervious concrete. We used the cello tape as the infiltration ring since our cubes were small. A given mass of water was poured into the ring and the time of the water to infiltrate is noted down. Then the infiltration rate was calculated. Fresh properties of pervious concrete like compaction factor test and slump test were conducted and compared with the normal concrete. We also focused on increasing compressive strength by using different aggregates and also determine durability properties by performing acid attack test and sulphate attack test and comparing its results. We also compared the pervious concrete with nominal concrete in terms of strength, durability, cost, permeability, density, shrinkage and physical appearanc