Microstructure engineering of Portland cement pastes and mortars through addition of ultrafine layer silicates

Lindgreen, Holger; Geiker, Mette Rica; Krøyer, H.; Springer, Niels; Skibsted, Jørgen

doi:10.1016/j.cemconcomp.2008.05.003

Cited by 78 publications

(29 citation statements)

References 47 publications

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“…The SEM image of the fracture surface of NS10 after 7 days illustrates a very condensed mortar structure and a good dispersion of NS clusters throughout the entire surface of hydrated cement products. The CH grains of NS10 are less visible than those of OPC, SF10 and FA10 [49,52,[59][60][61] . The SEM images of the fracture surfaces of OPC, NS10, SF10 and FA10 after 28 days of curing are given in Figure 8.…”

Section: Characterization Of the Mortar Specimensmentioning

confidence: 98%

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

2014

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The structural characteristics of cement mortars, impregnated with nano silica (NS), silica fume (SF) and fly ash (FA), were comparatively studied using Fourier transform infrared spectrometer (FTIR), thermogravimeter-differential thermogravimeter (TG-DTG) and scanning electron microscope (SEM). The mechanical strengths of the specimens were determined at early (7th day) and standard (28th day) curing ages. The compressive strengths and flexural strengths developed in the mortar specimens containing NS particles were found considerably higher than those of the corresponding specimens of SF and FA over and above the control at both ages. FTIR, TG-DTG and SEM analyses results were consistent with the remarkable increase in the mechanical strength of the mortars with NS. These increases in the strengths of the mortars with NS are attributable to the nano sized particles and extensive surface area of NS. The nano sized particles, as nucleating agents, promoted the hydration of C 3 S and C 2 S and the formation of C-S-H phase. Plenty of active sites on the surface of NS particles induced their pozzolanic reactivity and the extent of bond formation between NS particles and free CH.

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Section: Characterization Of the Mortar Specimensmentioning

confidence: 98%

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

2014

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“…The bulk density values of ultra-fine limestone blended cement pastes are higher than those of OPC and limestone blended cement pastes at all curing time. This is mainly attributed to the additional CSH phase formed as a result of hydration of C3S and C2S phases precipitates on the surfaces of ultra-fine particles of limestone as well as fills some of pores of hardened cement paste leads to increasing the bulk density [1,4,7]. It was noticed that the bulk density of limestone as well as ultra-fine limestone filled cement pastes decreases with filler content due to the dilution effect of filler materials.…”

Section: Preparation Of Cement Pastesmentioning

confidence: 94%

“…The pore structure of concrete strongly influences both mechanical behavior and transport properties, which are essential for the durability of the concrete. Addition of micro-and nano-particles to cementitious mixtures may resulted in a more homogeneous and finer pore structure [1].…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultra-Fine Limestone on the Physico-Mechanical Properties of Cement Pastes

Saraya

Tantawy

Taher

2010

Al-Azhar Bulletin of Science

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The aim of the present work is to study the effect of limestone and ultra-fine limestone fillers on the physico-mechanical properties of hardened cement pastes. The particle size distribution was determined by laser diffractometer and SEM as well as the mineralogical composition by X-Ray Diffraction (XRD) and Fourier transform Infrared (FT-IR). The OPC was replaced with limestone filler up to 15wt% as well as ultra-fine limestone to form eight mixes. The hydration characteristics of hydrated cement pastes were evaluated by measuring the combined water content, bulk density and compressive strength up to 90 days as well as FTIR and XRD techniques. The results were shown that the coarse limestone filler particles enhance the reaction with C3A forming calcium carboaluminate hydrates which contain higher amount of combined water content than CSH. Also, the ultra-fine limestone filler particles act as a nucleation site for the precipitation of hydration products and activated the hydration of C3S and C2S phases.

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“…For example, non-modified nano-kaolinite and nano-smectite enhanced the formation of C-S-H by providing nucleation surfaces in Portland cement paste (Lindgreen et al, 2008).…”

Section: Perspective On the Development Of New Materialsmentioning

confidence: 99%

Self-Compacted Clay based Concrete (SCCC): proof-of-concept

Ouellet-Plamondon

Habert

2016

Journal of Cleaner Production

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Construction using earth is gaining interest in developed countries, whereas this practice is common in Africa and was more common in Europe 200 years ago. The forecasted increasing demand for cement in emerging countries has created the need for alternative building materials. In this study, recent cement and concrete technologies are transferred to earthen constructions to create a SelfCompacted Clay Concrete. We showed that the use of a superplasticizer (SP) with earth alone reduced the yield stress and was more efficient when cement was added. The optimal rheology was reached with 1% polycarboxylate ethers superplastizer and 5% calcium sulfoaluminate cement. The setting was studied with a digital penetrometer. The accelerated phase of the CSA hydration occurred within 6 hours only when 5% of CSA was in the earth mixture. Cement transformed the interstitial liquid water between particles into chemically bound water that did not affect the flow in the fresh state. Mechanical tests on the dried self-compacting-clay concrete showed that the compressive strength was increased by a factor of four when reducing the initial water content. The compressive strength of earth material is known to vary with the dry density and the clay content in the compressed earth block. The novelty of our approach is that the identical results can be achieved with a material poured in a formwork rather than compacted. Finally, the carbon footprint of the solution was evaluated, and the results show that this new material is competitive with current construction techniques. AbstractConstruction using earth is gaining interest in developed countries, whereas this practice is common in Africa and was more common in Europe 200 years ago. The forecasted increasing demand for cement in emerging countries has created the need for alternative building materials. In this study, recent cement and concrete technologies are transferred to earthen constructions to create a Self-Compacted Clay Concrete. We showed that the use of a superplasticizer (SP) with earth alone reduced the yield stress and was more efficient when cement was added. The optimal rheology was reached with 1% polycarboxylate ethers superplastizer and 5% calcium sulfoaluminate cement. The setting was studied with a digital penetrometer. The accelerated phase of the CSA hydration occurred within 6 hours only when 5% of CSA was in the earth mixture. Cement transformed the interstitial liquid water between particles into chemically bound water that did not affect the flow in the fresh state.Mechanical tests on the dried self-compacting-clay concrete showed that the compressive strength was increased by a factor of four when reducing the initial water content. The compressive strength of earth material is known to vary with the dry density and the clay content in the compressed earth block. The novelty of our approach is that the identical results can be achieved with a material poured in a formwork rather than compacted. Finally, the carbon footprint of the solution was ...

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Microstructure engineering of Portland cement pastes and mortars through addition of ultrafine layer silicates

Cited by 78 publications

References 47 publications

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

Comparative study of the characteristics of nano silica - , silica fume - and fly ash - incorporated cement mortars

Effect of Ultra-Fine Limestone on the Physico-Mechanical Properties of Cement Pastes

Self-Compacted Clay based Concrete (SCCC): proof-of-concept

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