Enhancing physical-thermal-mechanical properties of fired clay bricks by eggshell as a bio-filler and flux

Nuchnapa Tangboriboon,Atima Netthip,Sopita Moonsri,Anuvat Sirivat,Watchara Sangwan

doi:10.2298/sos1901001t

Nuchnapa Tangboriboon, Atima Netthip + Show 3 more

Open Access

https://doi.org/10.2298/sos1901001t

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Abstract

Fired clay bio-bricks were prepared by adding eggshell as a bio-filler and flux into earthenware clay compounds via an extrusion process. In this study, the suiTab. conditions for clay bricks preparation were firing at 1000?C for a period of 5 h. Adding 20 wt% eggshell powder into the clay brick yielded good physical-mechanical-thermal properties: high compressive strength and hardness, low thermal expansion coefficient, and low water absorption. The measured compressive strength, hardness, and refractory water absorption were 7.0 MPa, 6.0 HV, and less than 15 wt%, respectively. The obtained clay brick with the eggshell powder added as shown here is potential for uses as bricks for construction and thermal insulation.

Highlights

The green building materials are gaining popularity and usage is growing rapidly
Fired clay brick is one of important building materials as it is made from natural raw materials such as clay, sand and water
The limitation of utilization and quality of bricks need to be improved to be accepted as modern building materials: good appearance, high compressive strength, high density, high hardness, light weight, low water absorption value, low heat transfer coefficient, good thermal shock resistance, low thermal expansion coefficient and long-life using time

Summary

Introduction

The green building materials are gaining popularity and usage is growing rapidly. The important factors influencing the growing green building materials are environmental regulations, benefits for health, de-carbonization, energy saving and friendliness [1,2]. The chemical compositions and characteristics of raw materials, the process of clay brick formation, firing temperature and firing time are important factors to obtain accepTab. fired clay bricks. A suiTab. filler is expected to modify physical, mechanical and thermal properties such as density, products color, water absorption, strength, hardness, Young’s modulus, thermal insulation, and heat transfer coefficient [12]. There are many agricultural wastes that can be used as a filler in clay bricks: rice husk, oat hull, barley husk, grape and cherry seed and corn husk ash [1,2]. The desirable and suiTab. characteristics of clay brick are good appearance, high strength, durability, low water absorption, energy saving during the processing and lightweight. The cleaned chicken eggshell was ground with a porcelain rapid ball mill for 120 min to obtain an eggshell powder

Instruments

Clay samples preparation by extrusion

Physical properties of raw materials and clay bricks

Mechanical and thermal properties of clay bricks

Conclusion