A Study on the Physical Characteristic and Environment Evaluation of Yellow Loess Mortar with Slaked Lime and Cement

摘要

Yellow loess is receiving substantial interest as a possible eco-friendly construction material. The advantages of yellow loess are its high heat absorption capacity, auto-purification properties, antibiotic properties, and infrared ray emission capability. Also, it is known to have various benefits, such as deodorizing, sanitizing, and adsorbing. However, due to low compressive strength and low shrinkage cracking resistance of loess, modern architecture is not actively pursued. Recently, various studies have been conducted to control the drying shrinkage of loess and improve mechanical strength by using various admixtures, but the environmental characteristics are not taken into consideration. Studies on yellow loess must be made on the physical characteristics as well as environmentally friendly characteristics. The purpose of this study is to examine the physical performance and environmental performance when ordinary Portland cement (OPC) or slacked lime (SL) is added to enhance the physical properties of yellow loess. The results indicate that the moisture controlling ability of the yellow loess mortar was decreasing when the OPC or SL is mixed, as the pores are blocked by the formation of the hydrate. And the emission of NH_3 from yellow loess mortar with OPC and SL occurred by the chemical reaction of NH_4~+ adsorbed into the yellow loess and alkali produced by the hydration of OPC and SL. But the compressive strength of the yellow loess mortar was increased as the content of SL and OPC increases. This is because aplite, which affects the strength improvement, was formed by reacting CaO and Ca(OH)_2 components of OPC and SL with silica components of yellow loess.