การศึกษาคอนกรีตที่ถูกทำลายมาใช้ทดแทนมวลรวมในคอนกรีต

A Study of Demolished Concretes as Aggregates in Concrete

Name: สุรศักดิ์ ภู่สันติพงษ์

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Recycled Aggregate

; Recycled Aggregate Concrete

; Fly ash

; Compressive Strength

; Expansion

Abstract: The objectives of this thesis are to study the demolished concrete properties and to investigate the properties of concrete mixture using demolished concrete as aggregate. Demolished concrete is a by-product of tested cylinder concretes. In this study, Tested cylinder concretes diameter 15?30 cm divided into 3 groups by compressive strength such as between 400-550 kg/cm2, 250-400 kg/cm2 and 180-250 kg/cm2 They were crushed by jaw crusher . The recycled aggregates saparated in fine recycled aggregates and coarse recycled aggregates. Water absorption, gradation, unit weight, attached mortar and Los Angeles abrasion loss of recycled aggregate were determined. The 10?20 cm concrete cylinder were cast by using a mixture of recycled aggregate as aggregate. Each type of coarse recycled aggregate was used to replace lime stone 100 percent by weight. Each type of fine recycled aggregate was used to replace 30, 50, 70 and 100 percent by weight of river sand. Compressive strengths were tested at the ages of 1, 3, 7, 14, 28, 60 and 90 days. At 28 days, the modulus of elasticity of concrete was also investigated. The 10?10?50 cm. concrete in water and magnesium sulfate solution were tested expansion until 367 days. The result revealed that the density of recycled aggregate concrete were between 2215 to 2387 kg/m3 ,which were less than that of control concrete. The compressive strength of recycled aggregate concrete made with coarse recycled aggregate and river sand at 28 days were between 85 to 87 percent as compare to control concrete strength. The compressive strength of recycled aggregate concrete made with coarse and fine recycled aggregate at 28 days were 78 to 89 percent as compare to control concrete strength which was decrease with the increasing of the amount of fine recycled aggregate in concrete. The modulus of elasticity of recycled aggregate concrete were 218400 to 294800 kg./ cm.2 that less than 26.25 to 45.78 percent as compare control concrete and 10 to 30 percent as compared ACI 318 standard. The expansion of concrete made with recycled aggregate in water and magnisium sulfate solution was higher than control concrete. However, the expansion of recycled aggregate concrete, which replaced cement by fly ash 20 percent tended to have less expansion than recycled aggregate concrete 4 to 26 percent, which was not replace by fly ash.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

Email: info.lib@mail.kmutt.ac.th

Name: รศ.ดร. ชัย จาตุรพิทักษ์กุล

Role: อาจารย์ที่ปรึกษา

Created: 2545

Issued: 2005-10-03

Modified: 2006-05-10

วิทยานิพนธ์/Thesis

ISBN: 9749605586

CallNumber: CVE1769

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมโยธา

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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ลำดับที่.	ชื่อแฟ้มข้อมูล	ขนาดแฟ้มข้อมูล	จำนวนเข้าถึง	วัน-เวลาเข้าถึงล่าสุด
1	CVE1769.pdf	15.31 MB	362	2024-02-01 09:33:08
2	CVE1769ab.pdf	91.43 KB	100	2020-05-17 14:56:45
3	CVE1769ab.txt	2.65 KB	105	2020-01-20 16:05:37

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