Influence of Metakaolin on Mechanical Properties of Fly Ash Geopolymer Mortar Reinforced with Steel Fibers
ผลกระทบของดินขาวเผาต่อสมบัติทางกลของเถ้าลอยจีโอโพลิเมอร์มอร์ต้าร์เสริมเส้นใยเหล็ก
Abstract
งานวิจัยนี้มีวัตถุประสงค์เพื่อศึกษาอิทธิพลของดินขาวเผาต่อคุณสมบัติของจีโอโพลิเมอร์มอร์ต้าร์ที่ทำจากเถ้าลอยเสริมเส้นใยเหล็ก โดยดินขาวเผานำมาใช้เพื่อทดแทนเถ้าลอยแคลเซียมสูงที่ร้อยละ 0, 10, 20 และ 30 โดยน้ำหนัก ได้ทำการศึกษาผลกระทบของปริมาณเส้นใยเหล็กต่อสมบัติของมอร์ต้าร์ ประกอบด้วย การทดสอบหาการแผ่ไหล หน่วยน้ำหนัก กำลังรับแรงอัด และกำลังรับแรงดัด ผลทดสอบพบว่าการใช้ดินขาวเผาร้อยละ 10 และ 30 มีความสามารถในการรับกำลังอัดและกำลังดัดสูงสุดเท่ากับ 4.21 และ 5.06 MPa ตามลำดับ และการเสริมเส้นใยเหล็กสามารถใช้เพื่อเพิ่มกำลังรับแรงอัดและแรงดัดได้ อย่างไรก็ตามการแผ่ไหลลดลงเมื่อเพิ่มปริมาณดินขาวเผาและเส้นใยเหล็กในส่วนผสมปริมาณร้อยละ 7.47 ถึง 25.67 และ 6.34 ถึง 30.27 ตวามลำดับ และหน่วยน้ำหนักของจีโอโพลิเมอร์มอร์ต้าร์ลดลงมากสุดปริมาณร้อยละ 4.29 เมื่อปริมาณดินขาวเผาเพิ่มขึ้น แต่หน่วยน้ำหนักของจีโอโพลิเมอร์มอร์ต้าร์เพิ่มขึ้นสูงสุดปริมาณร้อยละ 6.06 เมื่อใส่เส้นใยเหล็ก
This research aimed to study the influence of metakaolin on the properties of fly ash geopolymer mortar mixed with steel fibers. The metakaolin was used to replace high calcium fly ash at the percentages of 0, 10, 20, and 30 by weight. The effect of fiber content on the properties of the mortar was also studied. The slump flow, unit weight, compressive strength, and flexural strength were investigated. The results showed that the use of metakaolin at the percentages 10 and 30 have the highest value of compressive strength and flexural strength 4.21 and 5.06 MPa, respectively. Steel fibers can be used to increase compressive strength and flexural strength. However, the slump flow was decreased when the metakaolin and the fiber were added at the percentages 7.47 to 25.67 and 6.34 to 30.27, respectively. In addition, the unit weight of geopolymer mortar decreased at the percentage of 4.29 when metakaolin was increased. In contrast, the unit weight of geopolymer mortar was increased at the percentage of 6.06 by the addition of steel fiber.
Keywords
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DOI: 10.14416/j.ind.tech.2023.07.006
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