Effect of isobutyl-triethoxy-silane penetrative protective agent on the carbonation resistance of concrete

Xu, Qiang; Zhan, Shulin; Bingzheng, Xu; Yang, Hui; Qian, Xiaoqian; Ding, Xiaofu

doi:10.1007/s11595-016-1343-6

Cited by 16 publications

(4 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are some broadening in peaks and appearance of hump which suggest that POFA has certain amorphous phases (Figure 4b). From Figure 4, it can be seen that mPOFA and nPOFA contain Quartz (JCPDS = 88-2487), Cristobalite (JCPDS = 82-1410), and amorphous silica (JCPDS = 89-1665) which agree with other researchers’ work [24,28,32,45,46,47]. As the temperature was increased while treating raw POFA, the amorphous silica transformed into the crystalline phase.…”

Section: Test Results and Discussionsupporting

confidence: 87%

Optimization of Micro and Nano Palm Oil Fuel Ash to Determine the Carbonation Resistance of the Concrete in Accelerated Condition

et al. 2019

View full text Add to dashboard Cite

The carbonation rate of reinforced concrete is influenced by three parameters, namely temperature, relative humidity, and concentration of carbon dioxide (CO2) in the surroundings. As knowledge of the service lifespan of reinforced concrete is crucial in terms of corrosion, the carbonation process is important to study, and high-performance durable reinforced concretes can be produced to prolong the effects of corrosion. To examine carbonation resistance, accelerated carbonation testing was conducted in accordance with the standards of BS 1881-210:2013. In this study, 10–30% of micro palm oil fuel ash (mPOFA) and 0.5–1.5% of nano-POFA (nPOFA) were incorporated into concrete mixtures to determine the optimum amount for achieving the highest carbonation resistance after 28 days water curing and accelerated CO2 conditions up to 70 days of exposure. The effect of carbonation on concrete specimens with the inclusion of mPOFA and nPOFA was investigated. The carbonation depth was identified by phenolphthalein solution. The highest carbonation resistance of concrete was found after the inclusion of 10% mPOFA and 0.5% nPOFA, while the lowest carbonation resistance was found after the inclusion of 30% mPOFA and 1.5% nPOFA.

show abstract

Section: Test Results and Discussionsupporting

confidence: 87%

Optimization of Micro and Nano Palm Oil Fuel Ash to Determine the Carbonation Resistance of the Concrete in Accelerated Condition

et al. 2019

View full text Add to dashboard Cite

show abstract

“…With regards to carbonation, several studies in the literature indicate that a hydrophobic surface treatment is ineffective in significantly reducing carbonation rates [95] or may even accelerate carbonation, which was assigned to the circumstance that the hydrophobic treatment depresses the concrete moisture content, thus facilitating carbonation [96]. In contrast, other studies reported a positive effect of hydrophobic surface treatment on carbonation progression [97,98], while Xu et al [99] related the potential effect of a silane treatment to the initial porosity of the concrete, suggesting that hydrophobic treatment may be more effective in concrete with a dense pore structure.…”

Section: Prevention and Repair 541 Effect Of Surface Treatments On mentioning

confidence: 99%

“…While the above studies [93][94][95][96][97][98][99] concern the effect of hydrophobic treatments on the carbonation process, the literature is scarce regarding the effect on reinforcement corrosion in carbonated concrete. Even in cases where hydrophobic treatment reduces the saturation of the concrete pore structure to a degree that facilitates ongoing carbonation, the reduced saturation may simultaneously assist with reducing reinforcement corrosion rates significantly.…”

Section: Effect Of Surface Treatments On Corrosion In Carbonated Concmentioning

confidence: 99%

Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC

et al. 2020

View full text Add to dashboard Cite

Carbonation of concrete is generally assumed to lead to reinforcing steel corrosion. This mindset has long dictated the research priorities surrounding the developments towards new, low-emission binders. Here, by reviewing documented practical experience and scientific literature, we show that this widely held view is too simplistic. In fact, there are many cases from engineering practice where carbonation of the cementitious matrix surrounding the steel did not lead to noticeable corrosion or to corrosion-related damage at the level of a structure. The influencing factors that can, however, lead to considerable corrosion damage are identified as the moisture state, the microstructure of the carbonated concrete, various species that may be present – even in minor amounts – in the concrete pore solution, and the cover depth. The circumstance that a reduced pH alone is not sufficient to lead to significant steel corrosion in concrete seriously challenges the established approach of assessing the durability performance based on carbonation testing and modeling. At the same time, this circumstance offers great opportunities for reducing the environmental impact of concrete structures with low-emission binders. To realize these opportunities, the focus in research and engineering should shift from studying carbonation to studying corrosion of steel in carbonated concrete.

show abstract

“…One was the penetrative protective agent based on organic materials, with intention to block the surface pore structure; the other was the inorganic materials, such as mortar or cement paste, to isolate the matrix from erosion ions in outside environment. Silanes [16], ethyl silicate [17,18], and isobutyl-triethoxy-silane [19] were used as typical penetrative protective agents for the resistance of carbonation and erosion, and a silica-based hybrid nanocomposite was reported for surface treatment to reduce the water absorption and gas permeability [20]. One mechanism behind the enhanced impermeability was that the chemicals could go through the capillary and form an inorganic hydrophobic film along the capillary as a result of reacting with hydration products; the other was that these hydrates in the capillary structure would block the transportation of water and gas [21].…”

Section: Introductionmentioning

confidence: 99%

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Liu

Zhang

Tong

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Surface protection has been accepted as an effective way to improve the durability of concrete. In this study, nanosilica (NS) was used to improve the impermeability of cement-fly ash system and this kind of material was expected to be applied as surface protection material (SPM) for concrete. Binders composed of 70% cement and 30% fly ash (FA) were designed and nanosilica (NS, 0–4% of the binder) was added. Pore structure of the paste samples was evaluated by MIP and the fractal dimension of the pore structure was also discussed. Hydrates were investigated by XRD, SEM, and TG; the microstructure of hydrates was analyzed with SEM-EDS. The results showed that in the C-FA-NS system, NS accelerated the whole hydration of the cement-FA system. Cement hydration was accelerated by adding NS, and probably, the pozzolanic reaction of FA was slightly hastened because NS not only consumed calcium hydroxide by the pozzolanic reaction to induce the cement hydration but also acted as nucleation seed to induce the formation of C-S-H gel. NS obviously refined the pore structure, increased the complexity of the pore structure, and improved the microstructure, thereby significantly improving the impermeability of the cement-FA system. This kind of materials would be expected to be used as SPM; the interface performance between SPM and matrix, such as shrinkage and bond strength, and how to cast it onto the surface of matrix should be carefully considered.

show abstract

Effect of isobutyl-triethoxy-silane penetrative protective agent on the carbonation resistance of concrete

Cited by 16 publications

References 13 publications

Optimization of Micro and Nano Palm Oil Fuel Ash to Determine the Carbonation Resistance of the Concrete in Accelerated Condition

Optimization of Micro and Nano Palm Oil Fuel Ash to Determine the Carbonation Resistance of the Concrete in Accelerated Condition

Corrosion of steel in carbonated concrete: mechanisms, practical experience, and research priorities – a critical review by RILEM TC 281-CCC

Effect of Nanosilica on Impermeability of Cement‐Fly Ash System

Contact Info

Product

Resources

About