• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.335-336
• /
• 2010

This paper presents experimentally investigated the effects of pozzolan made from various by-Product materials on mechanical properties of mortar. Fly ash(FA), slag (BFS), and palm oil fuel ash (POFA) were partially used to replace Portland cement. The results suggest that mortars containing FA, BFS, and POFA can be used as pozzolanic materials in making concrete with 28day compressive strength. After curing, the mortar containing 10-30% FA or POFA, and 30% BFS exhibited compressive strengths that of the original Portland cement (OPC). The use of FA, POFA, and BFS to partially replace Portland cement has evaluation method of the Assessed Pozzolan-activity index.(API)

• Cement Symposium
• /
• no.30
• /
• pp.256-265
• /
• 2003

• Cement
• /
• s.182
• /
• pp.30-36
• /
• 2009

• Magazine of the Korea Concrete Institute
• /
• v.15 no.5
• /
• pp.10-16
• /
• 2003

• Magazine of the Korea Concrete Institute
• /
• v.15 no.5
• /
• pp.24-32
• /
• 2003

• Journal of the Korea Concrete Institute
• /
• v.16 no.3 s.81
• /
• pp.319-326
• /
• 2004

This paper investigates the effect of the concrete containing mineral admixtures(pozzolanic materials such as fly-ash, ground granulated blast-furnace slag, silica fume and meta kaolin) on the resistance properties to chloride ion invasion. The purposed testing procedure was applied to the concrete replaced mineral admixtures for 3${\~}$4 replacement ratios under water-binder ratios ranged from 0.40 to 0.55. For the electro-migration test, Tang and Nilsson's method was used to estimate the diffusion coefficient of chloride ion. As a results, the water-binder ratios, kinds of mineral admixtures and replacement ratios, water curing periods had a great effect on the diffusion coefficient of chloride ion, and the optimal replacement ratios had a limitation for each mineral admixtures. Also, the use of mineral admixtures by mass(replacement of OPC) enhance the resistance ability against chloride penetration compared with the plain concrete. The compressive strength was shown related to the diffusion coefficient of chloride ion, the compressive strength increases with the diffusion coefficient of chloride ion decreasing. Below the 50 MPa, the variation of diffusion coefficient of concrete replaced mineral admixtures was bigger than that of plain concrete.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.04a
• /
• pp.797-800
• /
• 2008

To decrease the usage of cement, the pozzolan reaction materials are used as a mineral admixture. Hwang Toh which is broadly deposited in Korea is well known as a environment friendly material and the activated Hwang Toh which has the property of pozzolan reaction is practically used as a mineral admixture of concrete. PET fiber which is made by recycled PET bottle controls micro crack in concrete. But the study about concrete mixed with reinforcing fiber is not enough and the property of Hwang Toh concrete mixed with PET fiber is more complicated case. So this study performed drying shrinkage experiment to analyse mechanical property of Hwang Toh concrete mixed with PET fiber.

• Magazine of the Korea Concrete Institute
• /
• v.11 no.2
• /
• pp.115-125
• /
• 1999

The purpose of this experimental research is to investigate the properties of workability and strength of the concrete containing admixtures such as silica fume, fly ash, ground granulated blast-furnace slag, and rice husk ash. For this purpose, the workability and the strength of the concrete containing each admixture were tested and analyzed according to the unit weight of binder and the replacement ratio of each admixture. As a result, considering their workability and strength, the existence of minimum binder weight and optimum replacement ratio of concrete containing admixture to plain concrete were obtained for each admixture.

• Magazine of the Korea Concrete Institute
• /
• v.6 no.5
• /
• pp.149-157
• /
• 1994

보통 포틀랜드 시멘트와 수용성 고분자 물질인 hydroxy propyl methyl cellulose(HPMC), 미세골재 및 혼화재료를 사용하여 W/C=0.1이 되도록 물을 첨가하고 twin roll mill로 혼합 성형한 후 60일간 양생하여 고강도 시멘트 경화체를 제조하였다. 이 경화체에 대한 휨강도 및 파괴인성을 검토하였다. SiC 분말 및 백색시멘트를 첨가한 경우 휨강도는 약 100MPa정도, 탄성계수는 80-95GPa의 값을 나타내었다. 실리카흄을 첨가한 경우 휨강도는 80MPa, 탄성계수는 60GPa의 값을 나타내었다.

• KIEAE Journal
• /
• v.7 no.4
• /
• pp.127-133
• /
• 2007

As a fundamental study on the corrosion resistance of reinforced concrete structures using Natural Inorganic Minerals exposed to carbonation environment, The test specimens were concrete(W/C=60%) with Natural Inorganic Minerals content of 0%, 10%. Accelerated carbonation and autoclave corrosion accelerated curing were then conducted with them. The corrosion resistance of steel in concrete with Natural Inorganic Minerals content of 0%, 10% was examined by corrosion form, half-cell potential, polarization resistance, corrosion area and weight loss after 24 hours of autoclave corrosion accelerated curing.The results of the study showed that as for steel in concrete with Natural Inorganic Minerals content of 10%, the corrosion resistance was more excellent than steel in concrete with Natural Inorganic Minerals content of 0%.