Chloride penetration and carbonation in concrete with rice husk ash and chemical activators

Gastaldini, A.L.G.; Isaia, Geraldo Cechella; Gomes, N.S.; Sperb, J.E.K.

doi:10.1016/j.cemconcomp.2006.11.010

Cited by 79 publications

(28 citation statements)

References 9 publications

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“…Incorporation of BRHA increases the rate of carbonation because of the lower concentration of cement and the increase in concrete porosity, allowing more CO 2 to infiltrate (Rukzon et al, 2009). When Ca(OH) 2 is removed from the paste, the hydrated CeSeH gel will liberate CaO, which will also carbonate (Gastaldini et al, 2007).…”

Section: Drying Shrinkagementioning

confidence: 98%

“…High amounts (up to 30%) of RHA could be blended with cement without adversely affecting the strength and permeability of concrete (Chatveera and Lertwattanaruk, 2009). For durability, RHA often improves the concrete's resistance to deterioration from sulfates and chlorides, and also lowers the temperature of fresh concrete (Huang et al, 2005;Gastaldini et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

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Durability of conventional concretes containing black rice husk ash

Chatveera¹,

Lertwattanaruk²

2011

Journal of Environmental Management

117

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Section: Drying Shrinkagementioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Durability of conventional concretes containing black rice husk ash

Chatveera¹,

Lertwattanaruk²

2011

Journal of Environmental Management

117

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“…These two contradictory effects of silica fume on concrete carbonation have been reported by a few researchers. Gastaldini et al [40] examined the role of chemical activators on the carbonation of concrete containing 20 % of rice husk ash as partial replacement of cement.…”

Section: Carbonation Of Concretes Containing Rice Husk Ashmentioning

confidence: 99%

“…Gastaldini et al [40] studied the influence of chemical activators (K 2 SO4, Na 2 SO 4 , Na 2 SiO 3 ) on the chloride-ion permeability of concrete made with 20 % of rice husk ash as partial replacement of cement. Water/binder ratios used were 0.35, 0.50 and 0.65 and binder/aggregate ratios were 1:3.75, 1:5.25 and 1:6.9.…”

Section: Effect Of Chloride Ions On Mortars and Concretes Containing mentioning

confidence: 99%

Rice Husk Ash

Ramezanianpour

2013

Springer Geochemistry/Mineralogy

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IntroductionRice-husk (RH) is an agricultural by-product material. It constitutes about 20 % of the weight of rice. It contains about 50 % cellulose, 25-30 % lignin, and 15-20 % of silica. When rice-husk is burnt rice-husk ash (RHA) is generated. On burning, cellulose and lignin are removed leaving behind silica ash. The controlled temperature and environment of burning yields better quality of rice-husk ash as its particle size and specific surface area are dependent on burning condition. For every 1000 kg of paddy milled, about 200 kg (20 %) of husk is produced, and when this husk is burnt in the boilers, about 50 kg (25 %) of RHA is generated. Completely burnt rice-husk is grey to white in color, while partially burnt ricehusk ash is blackish [1][2][3].Rice-husk ash (RHA) is a very fine pozzolanic material. The utilization of rice husk ash as a pozzolanic material in cement and concrete provides several advantages, such as improved strength and durability properties, reduced materials costs due to cement savings, and environmental benefits related to the disposal of waste materials and to reduced carbon dioxide emissions. Reactivity of RHA is attributed to its high content of amorphous silica, and to its very large surface area governed by the porous structure of the particles [1,2]. Generally, reactivity is favored also by increasing fineness of the pozzolanic material. However, Mehta [1] has argued that grinding of RHA to a high degree of fineness should be avoided, since it derives its pozzolanic activity mainly from the internal surface area of the particles. ProductionRice is the seed of the monocot plants Oryza sativa or Oryzaglaberrima. As a cereal grain, it is the most important staple food for a large part of the world's human population, especially in East and South Asia, the Middle East, Latin America, and the West Indies. It is the grain with the second-highest worldwide production, after corn.

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“…Otsuki et al (2003), Thomas et al (2013) and Gastaldini et al (2007) indicated that the carbonation depth increases with the increasement of water-cement ratio. Xiao et al (2012a) proposed that the mineral admixture replacing cement partially (10% by mass of the cement) seems to accelerate the carbonation.…”

Section: Carbonationmentioning

confidence: 99%

Durability of Recycled Aggregate Concrete: An Overview

Xiao

Deng

Ying

2013

ACT

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Recycled aggregate concrete (RAC) becomes a great concern for massive natural resoure comsumption and a huge construction waste. Many researchers have carried out numerous investigations on the durability of RAC. The purpose of this paper is to summarize the achievements and share them with researchers involved in the study on RAC. In this paper, the main durability index and test methods have been reviewed from worldwide literature. Secondly, the durability of RAC including chloride diffusion, freezing and thawing resistance, abrasion resistance, absorption, drying shrinkage and carbonation has been summarized based on literature study. Thirdly, the Grey Relational Analysis (GRA) has been applied to find the most critical factor determining the durability of RAC compared with that of natural aggregate concrete (NAC). At last, new types of recycled concrete have been discussed and compared with NAC.

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Chloride penetration and carbonation in concrete with rice husk ash and chemical activators

Cited by 79 publications

References 9 publications

Durability of conventional concretes containing black rice husk ash

Durability of conventional concretes containing black rice husk ash

Rice Husk Ash

Durability of Recycled Aggregate Concrete: An Overview

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