Functional Properties of SAP-Based Humidity Control Plasters

Abstract

The application of materials with high moisture storage capacity close to the interior surface presents a prospective passive method for improving indoor relative humidity conditions. In this paper, lime-cement plasters containing three different types of superabsorbent polymers (SAPs) in varying dosages are introduced and their mechanical, hygric, and thermal characteristics are analyzed in a relation to microstructure. The experimental results show a significant effect of both SAP amount and chemical composition on all functional properties of studied plasters. The incorporation of 1.5% of SAP may induce up to 2.5 better moisture buffering, thus significantly improving the passive humidity control capability. Considering overall functional parameters of SAP-modified plasters, the dosage of 1 wt.% can thus be viewed as a rational compromise between the moisture storage capability and mechanical properties. The obtained wide sets of parameters can be utilized directly as input data of computational models suitable for the assessment of the interior microclimate of residential and administrative buildings.

Microstructure Formation of Cement Mortars Modified by Superabsorbent Polymers

“…On the contrary, the hydration period was extended proportionally, in contrast with the reference mixture. Such finding could be aligned to an additional water supply to the cement during a later stage of the hydration reaction, thus SAP incorporation prolongs the hydration reaction and secures more thorough cement hydration [ 39 ]. This effect is visible also in Figure 6 , as the increased cumulative heat evolution over time, as compared with the reference mixture at a later age, despite very similar evolution within the first 12 h. Thus, the most noticeable changes were obtained by the A3 mixture (followed by B3), particularly by those mortars with the highest SAP content.…”

Study on Preparation and Humidity-Control Capabilities of Vermiculite/Poly(sodium Acrylate-acrylamide) Humidity Controlling Composite

“…According to the different humidity-controlling mechanisms and humidity-controlling substrates, humidity-controlling material can be divided into five categories: silica gel humidity-controlling material [9,10], inorganic humidity-controlling material [11][12][13], organic humidity-controlling material [14,15], biomass humidity-controlling material [16], and composite humidity-controlling material [17][18][19]. While single-material humidity control options like silica gel, inorganic, organic, and biomass materials offer limited moisture absorption capacity and slow humidity control rates, composite materials excel in providing high moisture absorption and rapid humidity control simultaneously.…”