Abstract
In this study, to reduce the use of cement and sand, porous feldspar with excellent economic efficiency was used as a substitute in the heat storage concrete layer. When porous feldspar and four other silicate minerals were used as substitute materials for sand in cement mortar, the specimen with the porous feldspar exhibited approximately 16–63% higher compressive strength, thereby exhibiting a higher reactivity with cement compared to the other minerals. To compensate for the reduction in strength owing to the decreased cement content, mechanical and chemical activation methods were employed. When the specific surface area of porous feldspar was increased, the unit weight was reduced by approximately 30% and the compressive strength was increased by up to 90%. In addition, the results of the thermal diffusion test confirmed that thermal diffusion increased owing to a reduction in the unit weight; the heat storage characteristics improved owing to the better porosity of feldspar. When chemical activation was performed after reducing the cement content by 5% and replacing the sand with porous feldspar, the compressive strength was found to be approximately twice that of an ordinary cement mortar. In a large-scale model experiment, the heat storage layer containing the porous feldspar exhibited better heat conduction and heat storage characteristics than the heat storage layer composed of ordinary cement mortar. Additionally, energy savings of 57% were observed.
Highlights
One of the characteristics of South Korea’s housing culture is that hot water is circulated through the piping underneath the floor
To examine the reactivity of porous feldspar with cement, the uniaxial compressive strength according to the mixing ratio was measured first and the results were compared with the compressive strengths of other substitute materials
When sand was replaced porous feldspar and four other silicate minerals in the cement mortar, the specimen that used the with porous feldspar and four other silicate minerals in the cement mortar, the specimen that used porous feldspar exhibited approximately 16–63% higher compressive strength, thereby confirming a the porous feldspar exhibited approximately 16–63% higher compressive strength, thereby higher reactivity with cement than other minerals
Summary
One of the characteristics of South Korea’s housing culture is that hot water is circulated through the piping underneath the floor. 2020, 13,13, 22ofof1717 content, studies have been conducted on activation methods for increasing the reactivity of substitute reduction inFurthermore, strength owing to the on decreased cement content,and studies have been in conducted activation materials. Representative porous materials include active carbon and zeolite, and studies on their use as construction materials have been reported [14–. Mineral groups, but their reserves in Feldspar, a representative aluminosilicate mineral, is a commonly found mineral as it accounts a representative aluminosilicate mineral, isofa glass commonly foundto mineral it accounts for Feldspar, 60% of Earth’s crust It is used for the manufacture in addition variousaspotteries and for. The surface tens of weathered feldspar porphyry, showing aofporous structure. Thermal, mechanical, and chemical methods were used for the activation of natural of natural feldspar, and changes in the density, strength, and surface structure were observed.
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