การปรับปรุงคุณสมบัติด้านความร้อนของคอนกรีตมวลเบาผสมเม็ดยางด้วยวัสดุเปลี่ยนสถานะ
Improvement on Thermal Properties of Rubberized Lightweight Concrete with Phase Change Material
Abstract
บทความนี้เป็นการปรับปรุงคุณสมบัติด้านความร้อนของคอนกรีตมวลเบาผสมเม็ดยางด้วยวัสดุเปลี่ยนสถานะ งานวิจัยประกอบด้วย 2 ส่วน คือ การปรับปรุงคุณภาพพื้นผิวมวลรวมที่ฝังตัวด้วยวัสดุเปลี่ยนสถานะด้วยซิลิกาฟูมเพื่อศึกษาการสูญเสียวัสดุเปลี่ยนสถานะหลังได้รับความร้อนซ้ำ และศึกษาคุณสมบัติของคอนกรีตผสมเม็ดยางผสมมวลรวมเบาฝังตัวด้วยวัสดุเปลี่ยนสถานะที่ไม่ปรับปรุงพื้นผิว และปรับปรุงพื้นผิวด้วยซิลิกาฟูม กำหนดอัตราส่วนน้ำต่อปูนซีเมนต์ เท่ากับ 0.35 และแทนที่มวลรวมละเอียด (ทราย) ด้วยเม็ดยาง 10 ถึง 30 เปอร์เซ็นต์โดยปริมาตร โดยทำการทดสอบซึ่งประกอบด้วย ในส่วนของมวลรวมเบา ได้แก่ คุณสมบัติของมวลรวมเบาก่อนและหลังปรับปรุงพื้นผิว คุณสมบัติของมวลรวมเบาหลังได้รับความร้อนซ้ำและ ในส่วนของคอนกรีต ได้แก่ คุณสมบัติเชิงกล เชิงกายภาพ และค่าสัมประสิทธิ์การนำความร้อน ผลการทดสอบพบว่า การปรับปรุงพื้นผิวมวลรวมเบาส่งผลให้เปอร์เซ็นต์การดูดซึมน้ำลดลง ความถ่วงจำเพาะของมวลรวมเพิ่มขึ้นและเมื่อนำมาผสมร่วมกับคอนกรีตผสมเม็ดยางส่งผลให้กำลังรับแรงอัดและกำลังรับแรงดัดเพิ่มขึ้น ในส่วนของค่าสัมประสิทธิ์การนำความร้อนพบว่ามีค่าแปรผันตามสถานะของวัสดุเปลี่ยนสถานะและปริมาณการแทนที่มวลรวมละเอียดด้วยเม็ดยาง
This research aims to improve the thermal properties of rubberized concrete with Phase Change Material (PCM). The experiment was divided into two parts, Surface improvement of PCM-Lightweight aggregates with silica fume to investigate the leakage of PCM after being subjected to heat cycles and Properties of the rubberized concrete mixed with PCM-Lightweight aggregates without surface treatment (PCMA) and with surface treatment (ASF-PCMA). The water to cement ratio was set at 0.35. The replacement rate of fine aggregate (sand) with crumb rubber was varied from 10% to 30% by volume. The experiment on the aggregate part consisted of properties of light weight aggregate before and after surface treatment and properties of the lightweight aggregate after being subjected to heat cycle. For the rubberized concrete part, the experiment included mechanical properties, physical properties, and thermal conductivity. The results showed that the surface treatment caused a decrease in water absorption percentage and an increase in the specific gravity of aggregates. Compressive and flexural strength were also increased when mixed with rubberized concrete. In terms of thermal conductivity, it was found to depend mainly on the PCM state and the amount of replacement fine aggregates with crumb rubber.
Keywords
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DOI: 10.14416/j.kmutnb.2022.10.003
ISSN: 2985-2145
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