Calcium hydroxide as a binder in portland cement paste

Berger, R.L.; Cahn, D.S.; McGregor, Julie

doi:10.1016/0010-4361(70)90041-8

Cited by 5 publications

(7 citation statements)

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“…C ALCIUM hydroxide [Ca(OH) 2 ] nanoparticles (CHNPs) are utilized for advanced bone restoration, 1 deacidification, and inhibition of ink corrosion of papers, 2 cultural heritage conservation, 3 consolidation of dolostone in historical buildings, 4 and synthesis of CaO nanoparticles. 5,6 Calcium hydroxide [Ca(OH) 2 ] is also important for portland cement production and hardening, 7,8 network structure development, 9 and advanced biomedical application. 10 Particularly, in the backdrop of advanced biomedical application, 10 the synthesis of CHNPs evolves as a very important aspect that demands thorough attention.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

et al. 2015

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The present work reports a simple, inexpensive method for synthesis of calcium hydroxide [Ca(OH) 2 ] nanoparticles (CHNPs). The method involves chemical precipitation (CP) in aqueous medium at room temperature. Calcium nitrate dihydrate [Ca (NO 3 ) 2 .2H 2 O] and sodium hydroxide were used as precursors. The CHNPs were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), Rietveld analysis, field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM), BET surface area evaluation as well as particle size distribution analysis techniques. The results confirmed the synthesis of CHNPs as the major phase. The CHNPs exhibited an average size of about 350 nm. In addition, some calcite phase formed due to the inevitable carbonation process. A very minor amount of aragonite phase was also present. A schematically developed new qualitative model is proposed to explain the genesis and subsequent evolution of the various phases at the nanoscale. The model helps to identify the rate-controlling step. It also highlights the implication of reaction kinetics control in synthesis of predesigned nanophase assembly.

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Section: Introductionmentioning

confidence: 99%

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

et al. 2015

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“…e experimental results in the literature [11] show that there is a good linear correlation between the adhesion rate of the recycled aggregate mortar and the water absorption rate, apparent density, and crushing index as well as the randomness and uncertainty of the value λ in equation (2). e expression of equation ( 2) can be directly used to obtain the linear expression in w water � a • w oldcem + b.…”

Section: Quantitative Analysis Of the Itz Icknessmentioning

confidence: 99%

“…Xie [1] studied the ITZ of concrete in 1983, and he divided the ITZ from the aggregates to the mortar into the following four microstructural models: the permeation and diffusion layer, contact layer, enrichment layer, and weak effect layer. According to Berger's sidewall effect [2], the water-cement ratio of the water film layer near the aggregate surface is higher than that of the cement slurry, and ettringite and other crystalline compounds with large crystals easily form around the aggregates, resulting in a loose structure and high porosity of the ITZ. e loose structure and high porosity reduce the bonding strength and permeability resistance of the interfacial zone, so the ITZ is referred to as the weak link in concrete.…”

Section: Introductionmentioning

confidence: 99%

Influence of the ITZ Thickness on the Damage Performance of Recycled Concrete

Tian

2021

Advances in Materials Science and Engineering

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The interfacial transition zone (ITZ) is a weak region of recycled concrete. To further study the influence of the ITZ on the damage performance of recycled concrete, a formula for calculating the ITZ thickness is derived, and the ITZ thickness is calculated for various recycled concrete mixtures with a recycled aggregate content of 30%. The concrete model test method and finite element analysis software were used to numerically simulate common concrete and recycled concrete with ITZ thicknesses of 0.05 mm, 1 mm, 2 mm, 3 mm, and 4 mm. The results show that the thickness of the ITZ has an obvious influence on the cracking strength of recycled concrete and that the cracking strength of recycled concrete decreases with increasing ITZ thickness. The cracks in recycled concrete initiate from the ITZ, and the damage degree increases with increasing ITZ thickness. Compared with that of common concrete, the cracking strength of recycled concrete with an ITZ thickness of no more than 2 mm (i.e., the replacement rate of the recycled aggregates is no more than 30%) is not significantly reduced.

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“…ITZ is a thin layer caused by the wall effect occurred between the aggregate and the bulk paste [14].…”

Section: Three-phase Composite Model Of Itzmentioning

confidence: 99%

“…e failure mechanism of concrete under high strain rate with a three-phase model was studied by Zhou and Hao [7], and this study showed that it influences the failure mode, failure time, and tensile strength remarkably. Berger [14] held that the wall effect led to higher porosity of cement paste on aggregate surface, which created a suitable circumstance for migration of water and ions and resulted in enrichment of calcium hydroxide and ettringite on aggregate surface. Simeonov and Ahamd [5] et al pointed out the unsteadiness of ITZ properties along direction perpendicular to aggregate surface.…”

Section: Introductionmentioning

confidence: 99%

A Trans‐Scale Young’ Modulus Calculation Model of ITZ Based on Void Shape Randomness and Calcium Hydroxide Enrichment

Liu

Zuo

Liu

2020

Advances in Materials Science and Engineering

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The randomness of void shape and enrichment of calcium hydroxide are significant in interfacial transition zone (ITZ) of concrete; however, current theoretical models of ITZ do not include these features. In this article, ITZ was regarded as a three-phase composite material, and the pore morphological parameters were defined according to the characteristics of microscopic pores, and the corresponding random distribution function was constructed. The calcium hydroxide enrichment factor was introduced, and a cross-scale ITZ Young’s modulus calculation model was established in combination with the Mori–Tanaka method. The reliability of the proposed model in this paper was verified through comparison to experimental results in a reference.

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Calcium hydroxide as a binder in portland cement paste

Cited by 5 publications

References 0 publications

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

Synthesis of Nano Calcium Hydroxide in Aqueous Medium

Influence of the ITZ Thickness on the Damage Performance of Recycled Concrete

A Trans‐Scale Young’ Modulus Calculation Model of ITZ Based on Void Shape Randomness and Calcium Hydroxide Enrichment

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