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Compressive Strength and Microstructure of Geopolymer Using Fly Ash and Extracted Silica from Rice Husk Ash

Kiatsuda Somna, Pramoul Punchana, Rattapon Somna


งานวิจัยนี้ศึกษากำลังอัดและโครงสร้างทางจุลภาคของจีโอพอลิเมอร์ที่ได้จากเถ้าถ่านหินและซิลิกาที่สกัดจากเถ้าแกลบซึ่งเถ้าแกลบถูกนำมาสกัดซิลิกาโดยการใช้กรดไฮโดรคลอริค (HCl) และแปรเปลี่ยนค่าอุณหภูมิการเผาแกลบในช่วง 100–800 องศาเซลเซียส นำเถ้าแกลบผสมเถ้าถ่านหินในอัตราส่วน 10 : 90 โดยน้ำหนัก และใช้สารละลายโซเดียมไฮดรอกไซด์ความเข้มข้น14 โมลาร์ ผสมจีโอพอลิเมอร์แบ่งเป็น 2 ลักษณะ คือ ลักษณะที่ 1 นำซิลิกาที่สกัดจากเถ้าแกลบผสมกับเถ้าถ่านหิน แล้วผสมกับสารละลายโซเดียมไฮดรอกไซด์ และลักษณะที่ 2 นำซิลิกาที่สกัดจากเถ้าแกลบผสมกับสารละลายโซเดียมไฮดรอกไซด์แล้วผสมกับเถ้าถ่านหิน ทดสอบกำลังอัดของวัสดุ ศึกษาโครงสร้างทางจุลภาคด้วยเทคนิค SEM และ XRD การศึกษาพบว่า จีโอพอลิเมอร์เพสต์จากเถ้าแกลบที่เผาที่อุณหภูมิ 200 องศาเซลเซียส ให้ค่ากำลังอัดสูงที่สุด วิธีผสมลักษณะที่ 1 ให้กำลังอัดที่สูงกว่าวิธีผสมลักษณะที่ 2 เนื่องจากมีค่าความเป็นด่างมากพอที่ชะซิลิกาและอะลูมินาจากวัสดุตั้งต้นเพื่อทำปฏิกิริยาจีโอพอลิเมอร์ไรเซชัน ลักษณะโครงสร้างทางจุลภาคเกิดสารประกอบใหม่ที่เกิดการจากทำปฏิกิริยาของเถ้าถ่านหินและซิลิกาที่สกัดจากเถ้าแกลบ

This research aimed to study compressive strength and microstructure of geopolymer using fly ash and extracted silica from rice husk ash. Silica was extracted from Rice Husk ash (RH) by hydrochloric acid treatment and burnt in a furnace with temperature between 100–800°C. RH was mixed with Fly Ash (FA) at a ratio of 10 : 90 by weight of binder and 14 M NaOH was used in mixing geopolymer pastes. There were 2 types of mixing geopolymer pastes. First, extracted silica from RH was mixed with FA, then, 14 M NaOH was added (GEO-SEP). Second, extracted silica from RH was mixed with 14 M NaOH then, FA was added (GEO-MIX). The compressive strength of geopolymer pastes were investigated. Microstructures were characterized by SEM and XRD. The results showed that geopolymer pastes made from extracted silica after RH was burnt at 200°C provided the highest compressive strength. GEO-SEP method had higher compressive strength than those of GEO-MIX. It was due to GEO-SEP method having a higher alkali concentration to leach silica and alumina from FA to be strating the starting materials for geopolmerization reaction than GEO-MIX method. The microstructure showed new compounds of geopolymer which was a result of the reaction between FA and extracted silica from RH.


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DOI: 10.14416/j.kmutnb.2020.12.010

ISSN: 2985-2145