Effects of Calcined Nano Attapulgite Clay on the Mechanical and Durability Properties of Cement Mortar

Abstract

In order to study the effect of the calcined nano attapulgite clay on Mechanical and Durability the properties of cement mortar, using the box-type resistance furnace to high temperature calcination, the dispersion, mechanical and durability properties of calcined nano attapulgite clay additives was investigated. At the same time, the micro structure of the cement mortar of adding the attapulgite clay was revealed. The results indicate ultrasonic dispersion can improve the dispersion of calcined nano-attapulgite clay in water. When the content is less than 2%, it can basically guarantee that the calcined nano-attapulgite clay will not settle in water for a short time. Compared with the normal cement mortar, mixed with the calcined nano attapulgite clay can reduces the fluidity of cement mortar, improve the mechanics and durability of the cement mortar. When the cement mortar of adding the 0.01 attapulgite clay, in 56 days of flexural strength than ordinary cement mortar increased by 6.43%, the compressive strength increased by 12.97%, the chloride ion diffusion coefficient of 28 days reduced by 19.84%. Microscopic test results indicated that the appropriate amount of attapulgite clay can promote hydration process of the cement, improve the microstructure of cement mortar, reduce internal cracks and pores. The microscopic structure was more compact.