Low Permeability Concrete for Buildings Located in Marine Atmosphere Zone using Clay Brick Powder

M Castillo,J Rodriguez,C Eyzaguirre,K Hernández

doi:10.1088/1757-899x/758/1/012093

M Castillo, J Rodriguez + Show 2 more

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https://doi.org/10.1088/1757-899x/758/1/012093

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Abstract

The concrete is not one hundred percent impermeable since the water that remains inside it causes its corrosion, in the case of reinforced concrete, exposed in an area of marine atmosphere, the sea salt mostly present in large particles of the marine spray, produce the reduction of the alkalinity of the concrete causing a rapid corrosion of the steel. There are buildings built in this marine area that have been designed without durability criteria, in which the use of pozzolanic materials is considered, for example, to fill the pores of the cement matrix and thus guarantee its impermeability. In the present study, the effect of clay brick powder (PLA) as a replacement for cement in concrete manufacturing is addressed, evaluating different characteristics of its components. The results indicate that pozzolanic activity and compressive strength increase, slump, voids content and the coefficient of permeability to water decreases.

Highlights

A durable concrete is one that has a dense structure with minimal total porosity and low permeability [1]; this being important in the concrete exposed to the water of the sea, because it delays the effect of sulfate attack and guarantees a minimum coating of steel [2]
The concrete is not one hundred percent impermeable since the water that remains inside it causes its corrosion, in the case of reinforced concrete, exposed in an area of marine atmosphere, the sea salt mostly present in large particles of the marine spray, produce the reduction of the alkalinity of the concrete causing a rapid corrosion of the steel
The results indicate that pozzolanic activity and compressive strength increase, slump, voids content and the coefficient of permeability to water decreases

Summary

Introduction

A durable concrete is one that has a dense structure with minimal total porosity and low permeability [1]; this being important in the concrete exposed to the water of the sea, because it delays the effect of sulfate attack and guarantees a minimum coating of steel [2]. The marine environment has different exposure areas of expure that influence the deterioration of concrete structures, being the marine atmosphere where the marine aerosol is formed and there is produces an increase in the concentration of salts that are transported inland [3]; these salts are less than 10 μm (floating and don’t settle) and greater than 10 μm (precipitate), these being the ones that cause corrosion of the steel located a few hundred meters to the inland of the coast [4] To minimize this corrosion, low permeability concrete made with calcined clay is used as a partial cement replacement [5].

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