Fundamental study on repair and life extension effect of reinforced concrete by surface penetrants

2021 ◽  
pp. 1329-1335
Author(s):  
D. Hanaoka ◽  
S. Miyazato
Keyword(s):  
Reinforced Concrete ◽  
Life Extension ◽  
Fundamental Study ◽  
Extension Effect

Influence of calcium nitrite on the passive films of rebar in simulated concrete pore solution

2017 ◽  
Vol 64 (3) ◽  
pp. 265-272 ◽  
Author(s):  
Yanbing Tang ◽  
Shengnian Wang ◽  
Yunpu Xu ◽  
Jingxu Ni
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Photoelectron Spectroscopy ◽  
Pore Solution ◽  
Concrete Structures ◽  
Passive Films ◽  
Life Extension ◽  
Reinforced Concrete Structures ◽  
Content Type ◽  
Calcium Nitrite

Purpose This paper aims to study the influence of the addition of calcium nitrite on the passive films of rebar to reveal what causes calcium nitrite to further prolong the durability service life of the reinforced concrete structures. Design/methodology/approach A comprehensive experimental study of the passive films, such as components, surface morphologies, electric structure and compactness, was carried out in a saturated calcium hydroxide solution which is normally used to simulate concrete pore solution by using X-ray photoelectron spectroscopy, atomic force microscopy, Mott–Schottky and potentiostatic polarization, respectively. Findings The results showed that the passivation behavior of rebar has been changed dramatically by the addition of calcium nitrite. That is, the passive film formed in the solution with the addition of 10 g/L Ca(NO2)2 had less donor density (Nd), more positive plat potential, smoother surface and lower content of Fehydrox than that formed in the solution without Ca(NO2)2. Originality/value The study focuses on the passive films and provides a more clear cognition of the durability service life extension of the reinforced concrete structures caused by the addition of calcium nitrite.

scholarly journals Aiweixin, a Traditional Uyghur Medicinal Formula, Extends the Lifespan of Caenorhabditis elegans

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Binggen Zhu ◽  
Kayama Jo ◽  
Ping Yang ◽  
Jurat Tohti ◽  
Jian Fei ◽  
...  
Keyword(s):  
Caenorhabditis Elegans ◽  
Signaling Pathway ◽  
Life Extension ◽  
Clinical Use ◽  
Wild Type ◽  
Traditional Uyghur Medicine ◽  
Medicine Prescription ◽  
Long Time ◽  
Extension Effect

Aiweixin (AWX) is a traditional Uyghur medicine prescription, which has been used to treat senile diseases for a long time. We investigate whether the AWX extends the lifespan of Caenorhabditis elegans. The AWX decoction was the conventional product for clinical use. The wild-type Caenorhabditis elegans (N2) and mutational worms, daf-16(mu86), glp-1(e2141), daf-2(e1370), and eat-2(ad465), were applied for the lifespan analysis. We found that the lifespan of the N2 adults' worm received 0.005 and 0.01 volume of AWX/total volume was extended significantly, compared to the control without treatment of AWX. The AWX at 0.01 volume of AWX/total volume significantly prolonged the life of both mutational worms, daf-16 (mu86) and eat-2(ad465), but did not increase the lifespan of the mutational worms, daf-2(e1370) and glp-1(e2141). These results indicated that the AWX significantly extended the lifespan of wild-type nematodes, and the life extension effect of AWX was related to the germline longevity pathway and IIS signaling pathway but independent of DAF-16/FOXO.

scholarly journals Fundamental Study on Repair Technology of Reinforced Concrete Based on Corrosion Pattern

2005 ◽  
Vol 54 (3) ◽  
pp. 320-325
Author(s):  
Daishin HANAOKA ◽  
Shinichi MIYAZATO ◽  
Masayoshi YANO ◽  
Atsuro MORIWAKE
Keyword(s):  
Reinforced Concrete ◽  
Fundamental Study ◽  
Repair Technology
Sign in / Sign up

Export Citation Format

Share Document