Abstract
Materials known as superabsorbent polymers (SAP) or hydrogels are currently used in quite a few applications, ranging from diapers or napkins to nutrient carriers and soil conditioners. The great ability of SAPs to absorb and hold a significant amount of water can be utilized well also in the construction sector. For instance, SAPs can serve as effective admixtures for mitigation of autogenous shrinkage of high-performance concrete, frost protection, or cracks sealing. In this paper, basic physical, hygric and thermal properties of cement mortars containing superabsorbent polymer admixtures are analyzed. Basic physical characteristics are measured using the water vacuum saturation method and helium pycnometry. Moisture diffusivity is determined by utilizing the results of water sorptivity measurements, water vapor diffusion permeability is measured by the cup method. Sorption isotherms are determined by the desiccator method in the range of relative humidity of 11% – 96%. Thermal conductivity and specific heat capacity are measured by pulse method. Experimental results show a very significant dependence of all hygric and thermal parameters on the SAP dosage in the mix.
Highlights
Concrete, as the most used man-made building material, stands out by high compressive strength, long-term durability, resistance to various aggressive environments, relatively low cost and abundance
This study is aimed at the investigation of changes in basic physical, hygric and thermal properties of cement mortars containing superabsorbent polymers (SAP) admixtures
Three prismatic samples having a size of 40 mm x 40 mm x 160 mm were used for bending strength measurement and the fragments of specimens leftover after the bending strength test were used for compressive strength determination
Summary
As the most used man-made building material, stands out by high compressive strength, long-term durability, resistance to various aggressive environments, relatively low cost and abundance. Cracks grow wider and may induce even total collapse of the damaged construction. In light of these facts, the inspection, precautions, maintenance, and repair of cracks take place in order to increase the service life of damaged construction. Notwithstanding, these actions are often very difficult and expensive [6]
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