Influence of eggshell powder on the Portland cement mortar properties

Autor: Rawnaq Salahuddin Mahdi, Ayad K. Hassan, Hussein Alaa Jaber
Rok vydání: 2020
Předmět:
Zdroj: Materials Today: Proceedings. 20:391-396
ISSN: 2214-7853
Popis: This research presents an experimental investigation of eggshell powder (ESP) addition influence on the Portland cement mortar performance. Two different eggshell powders states were prepared. These include untreated eggshell powder (UESP) and treated eggshell powder (TESP). The TESP consists of heating the ESP to 750 °C for one hour in an electric furnace. Cement mortar of ordinary Portland cement with (1:3), (cement to sand) ratio, were mixed with each of two ESP states (UESP and TESP) at different percentages ranged from (0 to 20) wt% of the total weight of the cement mortar mixture. Water absorption, thermal conductivity, compressive strength, and hardness properties are measured for the mortar samples after curing for (28 days). The results generally showed that the addition of ESP to the cement mortar improved its properties. The addition of TESP to mortar mixture gave better properties as compared to the UESP addition at the same weight ratio. The water absorption percentages of the samples were decreased by about 30% at 15 wt% addition of TESP. The compressive strength of the mortar was increased by 29% over the control mortar at 15 wt% addition of TESP. The hardness values of mortar are slightly enhanced with increasing ESP ratio, which increased by about 2.5% at 20 wt% addition of TESP. The better thermal insulation of mortar samples was obtained from the addition of UESP, reaching the rate of reduction in the thermal conductivity to 40% than the control mortar.
Databáze: OpenAIRE
Externí odkaz: