Effect of off-white rice husk ash on strength, porosity, conductivity and corrosion resistance of white concrete

2012 ◽  
Vol 31 ◽  
pp. 220-225 ◽  
Author(s):  
Rossella M. Ferraro ◽  
Antonio Nanni
Keyword(s):  
Corrosion Resistance ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
White Rice

Hydration process of rice husk ash cement paste and its corrosion resistance of embedded steel bar

2020 ◽  
Vol 27 (11) ◽  
pp. 3464-3476
Author(s):  
Hui Wang ◽  
Ai-lian Zhang ◽  
Lin-chun Zhang ◽  
Qian Wang ◽  
Yan Han ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Cement Paste ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Hydration Process ◽  
Steel Bar

scholarly journals SYNTHESIS OF ZEOLITE BETA DIRECTLY FROM RICE HUSK ASH: EFFECT OF REACTION COMPOSITION ON CRYSTALLINITY OF ZEOLITE BETA

2010 ◽  
Vol 6 (1) ◽  
pp. 11-15 ◽  
Author(s):  
Didik Prasetyoko ◽  
Zainab Ramli ◽  
Salasiah Endud ◽  
Halimaton Hamdan ◽  
Bogdan Sulikowski
Keyword(s):  
Rice Husk ◽  
Rice Husk Ash ◽  
Static Condition ◽  
Zeolite Beta ◽  
The Other ◽  
Crystalline Phases ◽  
Mixture Ratio ◽  
White Rice ◽  
Oxide Ratio ◽  
Solid Phases

White rice husk ash obtained from complete uncontrolled burning of rice husk contains more than 94% silica. The ash, which consists of crystalline silica of the type tridymite and a-crystobalite, was used directly as a source of silica in the synthesis of zeolite beta. The mole oxide ratio of the initial gel of 1.25-8Na2O: 10-120SiO2: Al2O3: 1-20TEA2O: 150-1000H2O was prepared and heated at 150°C in a static condition for 6 d. The solid phases formed were monitored by XRD technique. Influence of reaction mixture ratio in the initial gel to the crystalline products formed was studied. Results showed that the pure zeolite beta was formed in a certain range of reaction mixture, i.e.: 1.25-4Na2O : 15-45SiO2 : Al2O3 : 4-10TEA2O : 240-480H2O. The other ratio of reaction mixtures produced crystalline phases such as analcime, Na-P, mordenite, and gismondine, and non-reacted of a-crystobalite and tridymite. Keywords: rice husk ash, tridymite, a-crystobalite, zeolite beta, synthesis

scholarly journals Research on the Mechanical Strengths and the Following Corrosion Resistance of Inner Steel Bars of RPC with Rice Husk Ash and Waste Fly Ash

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1480
Author(s):  
Lili Cui ◽  
Hui Wang
Keyword(s):  
Corrosion Resistance ◽  
Fly Ash ◽  
Rice Husk ◽  
Electrical Resistance ◽  
Rice Husk Ash ◽  
Time History ◽  
Freeze Thaw ◽  
Steel Bars ◽  
Reactive Powder ◽  
Mechanical Strengths

In this paper, the slump flow and mechanical strengths (compressive and flexural strengths) of the reactive powder concrete (RPC) with rice husk ash (RHA) and waste fly ash (WFA) were investigated. The following corrosion resistance of steel bars-reinforced specimens was researched. The ultrasonic sound, the mass loss rate, the electrical resistance, and the electrical resistance time history curves were determined to reflect the corrosion resistance of steel bars. The influence of NaCl freeze–thaw cycles and dry–wet alternations was considered. Results showed that the addition of RHA and WFA demonstrated a negative effect on the fluidity of fresh RPC. The fluidity of fresh RPC with WFA was lower. Moreover, RHA and WFA could effectively improve the mechanical strengths of hardened RPC, and the enhancing effect of RHA was higher. The increasing dosage of RHA could improve the corrosion resistance of steel bars in RPC when the specimens were exposed to the environment of NaCl freeze–thaw cycles and dry–wet alternations. However, when WFA was added, the effect was the opposite. The steel bars in RPC corroded more seriously when the specimens were exposed to the environment of NaCl dry–wet alternations than the environment of NaCl freeze–thaw cycles.

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