Abstract
The treatment of concrete surface using more durable material is one way to slow down the damage process of material, which can negatively affect durability of construction. This paper is aimed at testing the geopolymer-type coating materials of different composition while placing emphasis on various techniques of surface pre-treatments of concrete to which they were applied. The main composition variables were as follows: the fly ash fineness (original, ground) and the addition of washing-aggregate sludge. Four compositions were tested and compared with the composition based on cement binder. The cement mixture was prepared using the same fillers. The following techniques of surface pre-treatment of concrete were applied: brushing, pressure washing, and pressure washing followed by penetration, together with non-treated surface being used for comparison. The effect of the surface treatment technique was tested through the adhesion strength, which was executed at 2, 7, 28, and 120 days after application of the coating. The influence of the composition of geopolymer coating material was also discussed. Geopolymer-based mixtures achieved better adhesive strength than the cement-based mixture, regardless of surface treatment technique. The addition of sludge microfiller seems to be beneficial in improving the adhesive strength of geopolymer-type coating material.
Highlights
The surfaces of many of the concrete structures are subject to deterioration due to freezing and thawing, penetration of solutions, weathering, chemical attack, and erosion
The following techniques of surface pre-treatment of concrete were applied: brushing, pressure washing, and pressure washing followed by penetration, together with non-treated surface being used for comparison
Pressure washing followed by penetration (PW + P): standard acrylate type penetrator
Summary
The surfaces of many of the concrete structures are subject to deterioration due to freezing and thawing, penetration of solutions, weathering, chemical attack, and erosion. The most effective way to reduce this damage is to prevent the ingress of fluid into the concrete, so as to prevent the penetration of aggressive chemicals. The treatment of concrete surface using more durable material is one way to slow down the damage process. Geopolymers are a type of inorganic polymer that can be formed at room temperature by using industrial waste/by-products as source materials to form a solid binder that looks like and performs to Ordinary Portland Cement (OPC) [2]. Geopolymers are referred to as possessing the following characteristics: abundant raw materials resources, energy saving and environment protection due to low energy consumption, thermal processing (if necessary) at relatively low temperature as well as due to little CO2 emission, simple preparation technique, good volume stability, reasonable strength gain in a short time, ultra-excellent durability, high fire resistance and low thermal conductivity [3]
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