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A platform for research: civil engineering, architecture and urbanism
Poster Study on Quantity Control of Calcium Ion separated from Concrete Member
When concrete specimen keep in outside, fluids have held on the concrete as the calcium hydroxide solution by effectof environmental conditions. Some calcium hydroxide is melted from cement in the fluids. If the calcium hydroxidesolution reacts with carbon dioxide, calcium carbonate has been produced. It’s insolubility and adhere on concrete as the whitedeposits. It does not impact to mechanical properties but affect to the appearance. It is called as efflorescence.This study aimed to restrain to melt the calcium hydroxide. Three types of the specimen were prepared. As two types for thewater shielding, a set accelerating agent and a surface impregnating agent were used. Normal type as without the water shieldingis also prepared. Waterproof treatment was conducted at surrounding of the top surface of the concrete. Then, water poured atthe area until 2cm from the top surface of the concrete. The water was picked in 1 and 2 days, and conducted ICP(inductivelycoupled plasma) spectrometry.From the results, quantity of the calcium ions of the water shielding cases was lower than that of the poured water. However,in the results after 2 days, the quantity of the calcium ions was almost same in all cases. In the results at the both case of theset accelerating agent and the surface impregnating agent, quantity of the calcium ions was controlled than without the watershielding. Thus, it indicated that the set accelerating agent and the surface impregnating agent are effective to prevent the meltof the calcium hydroxide which is separated from concrete member.
Poster Study on Quantity Control of Calcium Ion separated from Concrete Member
When concrete specimen keep in outside, fluids have held on the concrete as the calcium hydroxide solution by effectof environmental conditions. Some calcium hydroxide is melted from cement in the fluids. If the calcium hydroxidesolution reacts with carbon dioxide, calcium carbonate has been produced. It’s insolubility and adhere on concrete as the whitedeposits. It does not impact to mechanical properties but affect to the appearance. It is called as efflorescence.This study aimed to restrain to melt the calcium hydroxide. Three types of the specimen were prepared. As two types for thewater shielding, a set accelerating agent and a surface impregnating agent were used. Normal type as without the water shieldingis also prepared. Waterproof treatment was conducted at surrounding of the top surface of the concrete. Then, water poured atthe area until 2cm from the top surface of the concrete. The water was picked in 1 and 2 days, and conducted ICP(inductivelycoupled plasma) spectrometry.From the results, quantity of the calcium ions of the water shielding cases was lower than that of the poured water. However,in the results after 2 days, the quantity of the calcium ions was almost same in all cases. In the results at the both case of theset accelerating agent and the surface impregnating agent, quantity of the calcium ions was controlled than without the watershielding. Thus, it indicated that the set accelerating agent and the surface impregnating agent are effective to prevent the meltof the calcium hydroxide which is separated from concrete member.
Poster Study on Quantity Control of Calcium Ion separated from Concrete Member
SHIMO, Yuki (author) / KAWAKANE, Hajime (author) / YAMANE, Takashi (author) / KAWASAKI, Yuma (author)
2018-01-01
International Journal of Global Advanced Materials & Nanotechnology; Vol 1 No 3 (2018): Proceedings: 3rd World Congress on Materials Science & Engineering 2017; 106 ; 2577-0489
Article (Journal)
Electronic Resource
English
DDC:
690
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