Abstract
This paper describes the use of cement‐based waterproofing screed and waterproofing coating, in which 10% of the original amount of cement was replaced by fly ash and 2% of the crystallization admixture was added by weight of cement, as a mean of protection of concrete against aggressive environments. The modified materials were applied to the underlying concrete and subjected to testing of physical and mechanical properties after exposure to effects of aggressive environments for up to 18 months. The results of the analysis have shown that after the application of waterproofing materials, there is a sufficient development of the crystals in the underlying concrete to enhance its durability. Thus, it is possible to use fly ash functionally and efficiently in polymer cement systems as a substitute for the cement together with the crystallization admixture.
Highlights
Academic Editor: Emilio Bastidas-Arteaga is paper describes the use of cement-based waterproofing screed and waterproofing coating, in which 10% of the original amount of cement was replaced by fly ash and 2% of the crystallization admixture was added by weight of cement, as a mean of protection of concrete against aggressive environments. e modified materials were applied to the underlying concrete and subjected to testing of physical and mechanical properties after exposure to effects of aggressive environments for up to 18 months
From equation (1), it is evident that the radius of the capillary in the fourth power is the critical flow factor, and it is appropriate to reduce the capillary diameter to slow down the rate of degradation. e affection of cement sealant by aggressive gases generated by industrial processes, combustion engines, living organisms, etc., is conditioned by humidity along with the most common aggressive gases such as CO2, SO2, NO2, HCl, H2S, HF, NH3, and Cl2
Diluting acidic gaseous exhalants in water creates diluted solutions of inorganic acids, which react with components of cement sealant, especially Ca(OH)2 [6]. e products of cement paste corrosion occupy a larger volume, breaking the cohesion of hardened cement paste leading to decrease in pH and cracking. ese cracks allow for an accelerated corrosion of steel reinforcement due to a quicker decrease of pH [7, 8]
Summary
In order to decrease the permeability of the concrete surface against water, gaseous, and liquid aggressive environments, two insulating materials were developed and applied to the surface of the concrete. E presence of crystals and their evolution with respect to the age and effects of degradation were observed on test specimens, cut out of the remains of 150 mm concrete cubes after determination of depth of penetration of water under pressure using a circular saw with a diamond blade. (4) For the determination of pH values of concrete with treated and untreated surfaces, respectively, the samples were extracted from 3 specimens (150 mm concrete cubes) at a depth of approximately 15 mm. Specimens were placed in chamber with the treated side against the door in order to prevent the aggressive condensates from remaining on the treated side of the specimen
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