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Effect of Cementitious Material Content and Calcium Chloride on Compressive Strength of Concrete Made from Fly Ash and Calcium Carbide Residue

Name: ªÃÔ¹·Ãì ¹ÁÃÑ¡Éì

Organization : ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

keyword: Calcium Carbide Residue

; Fly Ash

; Cementitious Material

; Pozzolanic Material

Abstract: The objective of this thesis is to study the effect of cementitious material content and calcium chloride on compressive strength of concrete made from calcium carbide residue and fly ash. Calcium carbide residue is a by-product of acetylene gas process while fly ash is a by-product of thermal power plant. From the preliminary study, it was found that the chemical compositions of calcium carbide residue and fly ash could react together to form cementing properties. In this study, calcium carbide residue was sun-dried and ground by Los Angeles abrasion machine until the particle remained on sieve No.325 was not more than 34 percent. The original fly ash was classified by air classifier machine to have high fineness. The ground calcium carbide residue was mixed with classified fly ash to be a cementitious material of concrete. Ratio of fly ash to calcium carbide residue was 70:30 by weight. The 10?20 cm concrete cylinders were cast by using a mixture of calcium carbide residue and fly ash as the cementing material. The concretes were classified into 4 groups as their cementitious material contents which were 300, 375, 450, and 600 kg/m3. In each group, calcium chloride was added to the concrete of 0, 1, 3, 5 and 10 percent by weight of cementitious material. Moreover, 10 percent of Portland cement type I by weight of the cementitious material was added in the concrete mix in order to increase the compressive strength of concrete. Compressive strengths of concrete made from both mixtures were tested at the ages of 1, 3, 7, 14, 28, 60 and 90 days. In addition, the modulus of elasticity of concretes at 28 days were also investigated. The result revealed that pH of the fly ash-calcium carbide residue mixture was 12.33 and the specific gravity was 2.36. Water for normal consistency decreased with the increase of the amount of calcium chloride in the paste. Initial and final setting times of fly ash-calcium carbide residue paste were 67 and 180 minutes, respectively. The setting times of pastes were found to be longer with the higher of calcium chloride in the mixture. Slump of concrete increased with the increase of calcium chloride in the concrete mixture. Density of concretes were between 2228 to 2405 kg/m3. The use of calcium chloride not higther than 5 percent by weight of cementitious material had the tendency of bad effect on concrete and the use of 10 percent of calcium chloride resulted in lower the compressive strength of concrete. The compressive strength of concrete made from calcium carbide residue-fly ash as cementitious material was higher as the lower of the water-cementitious material ratio. It was found that the highest compressive strengths at 28 and 90 days of concrete with 600 kg/m3 of cementitious material were 213.7 and 249.2 ksc, respectively. The concrete with addition of 10 percent of Portland cement by weight of cementitious material gave strengths of 242 and 307.6 ksc, respectively, at 28 and 90 days. The modulus of elasticity of fly ash-calcium carbide residue concretes were 104800 to 243016 ksc which were a little less than that of the normal concrete with the same strength. The results suggested that the use of fly ash and calcium carbide residue as a new cementitious material in some concrete is possible, especially for concrete which is not required a very high strength at the early ages.

ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

Address: ¡Ãا෾ÁËÒ¹¤Ã (Bangkok)

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

Name: ªÑ ¨ÒµØþԷѡÉì¡ØÅ

Role: ÍÒ¨ÒÃì·Õè»ÃÖ¡ÉÒ

Created: 2544

Issued: 2006-03-08

Modified: 2553-10-01

ÇÔ·ÂÒ¹Ô¾¹¸ì/Thesis

ISBN: 9746287478

CallNumber: CVE1532

tha

DegreeName: ÇÔÈÇ¡ÃÃÁÈÒʵÃÁËҺѳ±Ôµ

Level: »ÃÔ­­Òâ·

Descipline: ÇÔÈÇ¡ÃÃÁâ¸Ò

Grantor: ÁËÒÇÔ·ÂÒÅÑÂà·¤â¹âÅÂÕ¾ÃШÍÁà¡ÅéÒ¸¹ºØÃÕ

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