Abstract
Cold joint in concrete due to delayed concrete placing may cause a reduced shear resistance and increased water permeation. This study presents an analytical model based on the concept of REV (Representative Element Volume) to assess the effect of water permeability in cold joint concrete. Here, OPC (Ordinary Portland Cement) concrete samples with cold joint are prepared and WPT (Water Permeability Test) is performed on the samples cured for 91 days. In order to account for the effect of GGBFS (Granulated Ground Blast Furnace Slag) on water permeability, concrete samples with the same W/B (Water to Binder) ratio and 40% replacement ratio of GGBFS are tested as well. Utilizing the previous models handling porosity and saturation, the analysis technique for equivalent water permeability with effective cold joint width is proposed. Water permeability in cold joint increases to 140.7% in control case but it decreases to 120.7% through GGBFS replacement. Simulation results agree reasonably well with experimental data gathered for sound and cold joint concrete.
Highlights
Concrete as a construction material has been widely used for its many advantages like cost-benefit, stable material supply, and high durability
The durability problem starting with steel corrosion can propagate to degradation of structural safety. It can be observed as corrosion staining in outer concrete surface and is getting worse through cracking, spalling, and acceleration of corrosion and comes to collapse of RC structure due to reduced steel area and bond strength [5, 6]. The pores and their connectivity are considered as major parameters for durability design and assessment since deteriorations like chloride attack and carbonation are quantitatively evaluated through pore structure system
Many models and techniques for chloride penetration and carbonation have been proposed considering micro pore structures [3, 4, 7,8,9], which are supported by complicated physicochemical models and system dynamics considering cement hydration, moisture transport, and pore structure formation [10]
Summary
Concrete as a construction material has been widely used for its many advantages like cost-benefit, stable material supply, and high durability. The durability problem starting with steel corrosion can propagate to degradation of structural safety It can be observed as corrosion staining in outer concrete surface and is getting worse through cracking, spalling, and acceleration of corrosion and comes to collapse of RC structure due to reduced steel area and bond strength [5, 6]. The pores and their connectivity are considered as major parameters for durability design and assessment since deteriorations like chloride attack and carbonation are quantitatively evaluated through pore structure system. The effects of cold joint and GGBFS on water permeation are analyzed and discussed in the paper
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