การใช้เถ้าแกลบ-เปลือกไม้เพื่อเป็นวัสดุปอซโซลาน

Name: จักรพันธุ์ วงษ์พา

Organization : มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

keyword: Rice Husk-Bark Ashes

; Compressive Strength

; Percentage Compressive Strength

; Mortar

; Pozzolanic Material

Abstract: The objective of this research was to study the basic properties of rice husk-bark ash which is a by-product from burning process of rice husk and bark from biomass power plant. In this study, rice husk-bark ashes from power plants No. 2, 3, and 4 of Thai Power Supply Co., Ltd. were selected. The total of rice husk-bark ashes from these power plants are about 435 tons/day. Physical and chemical properties of rice husk-bark ashes were investigated. Ground rice husk-bark ashes with 2 different finenesses were major parameters to be studies in this investigation. The first one was ground until the particle of rice husk-bark ash retained on sieve No.325 was 0-5 percent by weight and the other is retained on sieve No.325 between 25-30 percent by weight. Portland cement type I was replaced by ground or unground rice husk-bark ash for casting mortars. Compressive strength of mortars containing rice husk-bark ash from 10 to 50 percent by weight of cementitious material (cement + rice husk-bark ash) were tested at the ages of 1, 7, 14, 28, 60 and 90 days.The particle shapes of all samples before grinding are rough, high porosity and irregular shape. The porosity decreases after grinding and dependes on fineness of samples. Normal consistency of pastes containing of three sources of rice husk-bark ash has the same trend and decreases as the increase of fineness. Setting times of pastes containing rice husk-bark ash also depends on fineness of rice husk-bark ash. More fineness gives shorter the setting time of rice husk-bark ash pastes. However, the percent replacement is not significant factor on the setting time of rice husk-bark ash pastes. Chemical composition of all three sources show that the sum of SiO2 + Al2O3 + Fe2O3 is higher than 80 percent but LOI of the 2nd plant is 10.19 percent that is very high when compare with the 3rd and 4th plants which are 2.23 percent and 3.72 percent, respectively.Compressive strength of original rice husk-bark ash mortar with 20 percent replacement at 28 days are lower than 50 percent of cement mortar (control) for all three sources and the rice husk-bark ashes do not suitable to use as pozzolan. However, the ground rice husk-bark ashes to have particles retained on standard sieve No.325 of 25-30 percent (CR) with 20 percent replacement give compressive strength of 80-100 percent of cement mortar strength at 28 days. When ground rice husk-bark ash (GR) is used in the same condition, the compressive strength is higher than 100 percent of the cement mortar strength at 28 days for all sources. Considering the percent replacement of rice husk-bark ashes, it was found that the compressive strength of mortar decreased with the higher replacement for all sources and finenesses. It can be concluded that fineness and percent replacement of rice husk-bark ashes are important factors on compressive strength of rice husk-bark ash mortars than that of chemical composition. The higher fineness of rice husk-bark ashes gives the higher compressive strength of rice husk-bark ash mortars.

มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

Address: กรุงเทพมหานคร (Bangkok)

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

Name: รศ.ดร.ชัย จาตุรพิทักษ์กุล

Role: อาจารย์ที่ปรึกษา

Created: 2546

Issued: 2005-11-18

Modified: 2006-05-09

วิทยานิพนธ์/Thesis

ISBN: 974960573X

CallNumber: CVE1799

tha

DegreeName: วิศวกรรมศาสตรมหาบัณฑิต

Level: ปริญญาโท

Descipline: วิศวกรรมโยธา

Grantor: มหาวิทยาลัยเทคโนโลยีพระจอมเกล้าธนบุรี

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3	CVE1799ab.txt	3.33 KB	60	2021-04-24 23:22:48

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