Properties of cement-based bricks with oyster-shells ash

Li, Gengying; Xu, Xiaoyang; Chen, E.; Fan, Jie; Guang-jing, Xiong

doi:10.1016/j.jclepro.2014.12.023

Cited by 125 publications

(44 citation statements)

References 26 publications

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“…It could be concluded that, due to the effect of CCNPs stacking effect and its irregular shapes, coupled with the combined effect of weakening the nanoscale effect, when the amount of CCNPs increases, more water was needed for the dispersion of CCNPs, which easily results in an aggregation effect in the mix. As reported [ 40 , 41 , 42 , 43 , 44 , 45 ], the pore structure of cement-based materials influences its physical properties directly, including compressive strength and durability.…”

Section: Resultsmentioning

confidence: 93%

“…Seashells are heavily abandoned in coastal areas [ 39 , 40 , 41 ], which are assembled from traditional ‘brick and mortar’ structure arrangements [ 42 ]. Furthermore, seashells are composite of more than 90% calcium carbonate and a small amount of organic matter [ 43 ], which means calcium carbonate nanoplatelets (CCNPs) and organic matter constitute the integrated structure of the seashells [ 41 ].…”

Section: Introductionmentioning

confidence: 99%

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Microstructural Properties of Cement Paste and Mortar Modified by Low Cost Nanoplatelets Sourced from Natural Materials

Huang

Liao

et al. 2018

Materials

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Nanomaterials have been widely used in cement-based materials. Graphene has excellent properties for improving the durability of cement-based materials. Given its high production budget, it has limited its wide potential for application in the field of engineering. Hence, it is very meaningful to obtain low cost nanoplatelets from natural materials that can replace graphene nanoplatelets (GNPs) The purpose of this paper is to improve the resistance to chloride ion penetration by optimizing the pore structure of cement-based materials, and another point is to reduce investment costs. The results illustrated that low cost CaCO3 nanoplatelets (CCNPs) were successfully obtained under alkali treatment of seashell powder, and the chloride ion permeability of cement-based materials significantly decreased by 15.7% compared to that of the control samples when CCNPs were incorporated. Furthermore, the compressive strength of cement pastes at the age of 28 days increased by 37.9% than that of the plain sample. Improvement of performance of cement-based materials can be partly attributed to the refinement of the pore structure. In addition, AFM was employed to characterize the nanoplatelet thickness of CCNPs and the pore structures of the cement-based composites were analyzed by MIP, respectively. CCNPs composite cement best performance could lay the foundation for further study of the durability of cement-based materials and the application of decontaminated seashells.

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Section: Resultsmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Microstructural Properties of Cement Paste and Mortar Modified by Low Cost Nanoplatelets Sourced from Natural Materials

Huang

Liao

et al. 2018

Materials

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“…It is effective in the strength development when added to an appropriate amount of pozzolanic material. Insufficient or excessive pozzolanic material would limit strength development [ 24 , 25 ]. The pozzolan reaction was activated by the increased OPC + OSP and OPC + SMS content at 15% mixing ratio at 28 days of curing.…”

Section: Resultsmentioning

confidence: 99%

Effect of Industrial By-Products on Unconfined Compressive Strength of Solidified Organic Marine Clayey Soils

et al. 2015

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The use of industrial by-products as admixture to ASTM Type I cement (ordinary Portland cement (OPC)) was investigated with the objective of improving the solidification of organic marine clayey soils. The industrial by-products considered in this paper were oyster-shell powder (OSP), steelmaking slag dust (SMS) and fuel-gas-desulfurized (FGD) gypsum. The industrial by-products were added to OPC at a ratio of 5% based on dry weight to produce a mixture used to solidify organic marine clayey soils. The dosage ratios of mixtures to organic marine clayey soils were 5, 10 and 15% on a dry weight basis. Unconfined compressive strength (UCS) test after 28 days revealed that the highest strength was obtained with the OPC + SMS 15% mixing ratio. The UCS of specimens treated with this mixture was >500 kPa, compared with 300 kPa for specimens treated with a 15% OPC + OSP mixture and 200 kPa when 15% of OPC was used alone. These results were attributed to the more active hydration and pozzolanic reaction of the OPC + SMS mixture. This hypothesis was verified through X-ray diffraction (XRD) and scanning electron microscopy (SEM) analyses, and was confirmed by variations in the calcium carbonate (CaCO3) content of the materials during curing.

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“…[11,12,14] and [15] used different types of seashell to replace the coarse or fine aggregate in the concrete in range of 5% to 50% and found out that the compressive strength increased significantly. [13] had used oyster shells ashes to replace lime in production of cement based brick. It is showed that, at 15% replacement, the increment of the compressive strength was also significant.…”

Section: Gcomse2017mentioning

confidence: 99%