Faculty Publications
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Item Use of Image Analysis to Study Top Surface Clogging of Pervious Concrete(American Institute of Physics Inc., 2023) Jacob, P.; Dwarakish, G.S.; Wani, A.S.; Jalihal, V.Pervious concrete is a type of sustainable concrete that can prevent excess urban runoff and increase groundwater storage. Though pervious concrete has a lot of advantages as a sustainable building material, the main disadvantage is the low strength and clogging of its concrete matrix. Clogging takes place in the top layers of the concrete matrix. The paper discusses image analysis on the top surface of pervious concrete to understand clogging patterns. The clogging material used is clay and sand. The image analysis is done in ImageJ software. The statistical analysis is done in R. The sand clogging of the pores is predominant compared to clay clogging since the aggregate size used is 2.36mm to 4.75mm, and the clogging sand particle size ranges from 1mm to 6mm. Since the top surface is the deciding surface for the overall clogging of the pervious concrete mix, a detailed analysis of the pore distribution becomes essential to predict the clogging of the concrete. © 2023 American Institute of Physics Inc.. All rights reserved.Item Hydraulic Performance of Pervious Concrete Based on Small Size Aggregates(Hindawi Limited, 2022) Mulu, A.; Jacob, P.; Dwarakish, G.S.The paper aims to study the impact of clogging on pervious concrete mixes and explore a simple method to calculate permeability and clogging using the falling head method in a fabricated unit. The materials used are cementitious materials and aggregates, along with superplasticizers. The cementitious materials used are OPC Grade 53 cement and micro Ground Granulated Blast Furnace Slag (μGGBS). Two separate narrow aggregate gradations are used: 2.36-4.75 mm and 4.75-6.30 mm. The water-binder ratio is taken as 0.25, and the aggregate-binder ratio is taken as 3.33. The compressive strength, permeability, and clogging potential of pervious concrete are calculated. The average permeability for 2.36-4.75 mm and 4.75-6.3 mm is 4.78 mm/s and 8.16 m/s, respectively. The clogging materials used are clay and sand with a concentration of 5 g/l. The introduction of clay slurry reduces the permeability by 69.8% and 74.9%, respectively, and with sand, it decreases by 74.7% and 71.7%, respectively, in its first cycle. The permeability response for such small aggregates is different from the standard coarse aggregates. The paper compares the study's compressive strength, porosity, and permeability with the existing literature. It concludes that the maximum clogging occurs when the clogging material is introduced to the specimen for the first time. The degradation of permeability depends on the clogging particle's particulate size and the concrete matrix's pore size. The smaller aggregates in pervious concrete are not recommended in areas of high siltation. © 2022 Arega Mulu et al.