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Performance of Lightweight Aggregate Mortar Containing Pumice Blended with Palm Oil Fuel Ash Clinker and Metakaolin for Elevated Temperatures and Chloride Permeability Resistance

Benjawan Prajaklertwittaya, Danupon Tonnayopas


งานวิจัยนี้เกี่ยวกับการศึกษาสมรรถนะของมอร์ตาร์มวลรวมน้ำหนักเบาใส่พูมิซผสมผสมตะกรันเถ้าเชื้อเพลิงปาล์มน้ำมันและดินขาวแปรต่อการทนไฟและต้านการซึมผ่านของคลอไรด์ โดยใช้ตะกรันเถ้าเชื้อเพลิงปาล์มน้ำมันและดินขาวแปรแทนที่ปริมาณปูนซีเมนต์ปอร์ตแลนด์ธรรมดา ชนิดที่ 1 ในอัตราส่วนร้อยละ 0, 10, 20 และ 30 โดยมวล ที่อัตราส่วนน้ำต่อวัสดุประสาน 0.35 บ่มตัวอย่างมอร์ตาร์ที่บรรยากาศห้อง เป็นระยะ 3, 7, 28, 56 และ 90 วัน ทดสอบกำลังอัดและการสูญเสียน้ำที่อุณหภูมิห้องและอุณหภูมิที่สูงขึ้น (200 และ 400 องศาเซลเซียส) ด้วยมอร์ตาร์ทรงลูกบาศก์ขนาด 50 × 50 × 50 มิลลิเมตร หล่อมอร์ตาร์ทรงกระบอกขนาด 100 × 50 มิลลิเมตร สำหรับทดสอบการซึมผ่านได้ของคลอไรด์ พบว่า มอร์ตาร์ผสมดินขาวแปรร้อยละ 20 มีกำลังอัดสูงสุดที่อุณหภูมิห้องและที่อุณหภูมิ 400 องศาเซลเซียส มีค่าการนำความร้อนต่ำกว่าตัวอย่างควบคุม และมีการซึมผ่านได้ของประจุคลอไรด์ต่ำที่สุด สำหรับตัวอย่างผสมตะกรันเถ้าเชื้อเพลิงปาล์มน้ำมันและดินขาวแปรร้อยละ 10 มีสมรรถนะเชิงกลมากกว่าตัวอย่างควบคุม เมื่อวิเคราะห์ด้วยภาพถ่ายจุลทรรศน์อิเล็กตรอนแบบส่องกราด พบว่า C-S-H และ C-A-H ซึ่งได้จากปฏิกิริยาไฮเดรชันและปฏิกิริยาปอซโซลาน ช่วยพัฒนาสมรรถนะเชิงกล สามารถทนต่ออุณหภูมิสูง และลดการไหลผ่านของประจุคลอไรด์

This research aims to investigate the performance of lightweight aggregate mortar containing pumice blended with palm oil fuel ash clinker and metakaolin for elevated temperatures and chloride permeability resistance. Specimens were carried out by replacing Ordinary Portland cement with palm oil fuel ash clinker and metakaolin at a percentage of 0, 10, 20 and 30 by weight of binder. The water to binder ratio of 0.35 was fixed for all specimens. Specimens were cured in ambient temperature for the period of 3, 7, 28, 56 and 90 days. The compressive strength and water losing value in ambient and elevated temperatures (200 and 400°C) were determined for hardened cubic specimens in size of 50 × 50 × 50 mm. Rapid chloride permeability test was determined with 100 × 50 mm cylindrical specimen. The specimen blended with 20% metakaolin content has the highest compressive strength in ambient temperature and at 400°C; the thermal conductivity value is also lower than the control specimen. Moreover, the rapid chloride permeability test provided the lowest chloride ion charge passed. The specimen blended with 10% palm oil fuel ash clinker incorporating metakaolin has surpassed compressive strength than the control specimen. SEM microphotographs recognized C-S-H and C-A-H crystals which are products from hydration and pozzolanic activity that uphold the mechanical performance, resist elevated temperature and suppress the charge passed.


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Full Text: PDF

DOI: 10.14416/j.kmutnb.2021.03.007

ISSN: 2985-2145