The Effect of TiO2 Doped Photocatalytic Nano-Additives on the Hydration and Microstructure of Portland and High Alumina Cements

Perez-Nicolas, M.; Navarro-Blasco, Í.; Fernández, José María Fernández; Álvarez, J.I.

doi:10.3390/nano7100329

Cited by 17 publications

(13 citation statements)

References 47 publications

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“…TiO 2 [17]. The decrease in strength is normally caused by an increase in porosity [18][19][20]. In our samples, an increase in porosity was also observed caused by the addition of TiO 2 nanoparticles, as will be shown later.…”

Section: Mechanical Propertiessupporting

confidence: 77%

Effect of TiO2 Addition on Mortars: Characterization and Photoactivity

et al. 2019

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In this study, mortar specimens were prepared with a cement:sand:water ratio of 1:3:0.5, in accordance with standard EN196-1. Portland CEM I 52.5 R grey (G) and white (W) cements were used, together with normalised sand and distilled water. Different amounts of TiO 2 photocatalyst were incorporated in the preparation of the mortar samples. The effect of the addition of TiO 2 was studied on mechanical properties of the mortar and cement including compressive and flexural strength, consistency (the flow table test), setting time and carbonation. Characterization techniques, including thermogravimetry, mercury porosimetry and X-ray diffraction spectroscopy (XRD), were applied to study the physico-chemical properties of the mortars. It was shown that adding the photocatalyst to the mortar had no negative effect on its properties and could be used to accelerate the setting process. Specimen photoactivity with the incorporated photocatalyst was tested for NOx oxidation in different conditions of humidity (0% RH and 65% RH) and illumination (Vis or Vis/UV), with the results showing an important activity even under Vis radiation.

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Section: Mechanical Propertiessupporting

confidence: 77%

Effect of TiO2 Addition on Mortars: Characterization and Photoactivity

et al. 2019

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“…The NO x degradation capability was evaluated in the test section built at the Institute of Highway Engineering in Aachen, Germany, to understand the applicability of the surface treatment to asphalt pavements. María Pérez-Nicolás et al modified the mortars with two different binders (Portland cement (PC) and high alumina cement (HAC)) as well incorporating them with nano-structured photocatalytic additives (bare TiO 2 , Fe doped (Fe-TiO 2 ) or vanadium doped TiO 2 (V-TiO 2 ) [120]. The inclusion of nano-structured additives resulted in the generation of additional nucleation sites, which in turn caused the acceleration of the hydration process of the cementitious binders.…”

Section: No X Removalmentioning

confidence: 99%

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

et al. 2020

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Titanium dioxide (TiO2) has been extensively investigated in interdisciplinary research (such as catalysis, energy, environment, health, etc.) owing to its attractive physico-chemical properties, abundant nature, chemical/environmental stability, low-cost manufacturing, low toxicity, etc. Over time, TiO2-incorporated building/construction materials have been utilized for mitigating potential problems related to the environment and human health issues. However, there are challenges with regards to photocatalytic efficiency improvements, lab to industrial scaling up, and commercial product production. Several innovative approaches/strategies have been evolved towards TiO2 modification with the focus of improving its photocatalytic efficiency. Taking these aspects into consideration, research has focused on the utilization of many of these advanced TiO2 materials towards the development of construction materials such as concrete, mortar, pavements, paints, etc. This topical review focuses explicitly on capturing and highlighting research advancements in the last five years (mainly) (2014–2019) on the utilization of various modified TiO2 materials for the development of practical photocatalytic building materials (PBM). We briefly summarize the prospective applications of TiO2-based building materials (cement, mortar, concretes, paints, coating, etc.) with relevance to the removal of outdoor/indoor NOx and volatile organic compounds, self-cleaning of the surfaces, etc. As a concluding remark, we outline the challenges and make recommendations for the future outlook of further investigations and developments in this prosperous area.

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“…Titanium dioxide (NT) nanoparticles find their application mainly in the production of photocatalytically active cement-based surfaces, due to their ability to decontaminate pollutants via photocatalytic processes [ 81 , 82 ]. Their effect on the hydration, mechanical properties, and durability of cement-based composites has also been extensively studied [ 24 , 83 , 84 , 85 , 86 ]. However, the incorporation of NT as an admixture for improving the thermal resistance of cement-based composites has not yet gathered significant attention ( Table 3 ).…”

Section: The Effect Of Nanotitania On the Thermal Resistance Of Cementioning

confidence: 99%

The Influence of Nanomaterials on the Thermal Resistance of Cement-Based Composites—A Review

2018

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Exposure to elevated temperatures has detrimental effects on the properties of cementitious composites, leading to irreversible changes, up to total failure. Various methods have been used to suppress the deterioration of concrete under elevated temperature conditions. Recently, nanomaterials have been introduced as admixtures, which decrease the thermal degradation of cement-based composites after exposure to high temperatures. This paper presents a comprehensive review of recent developments related to the effects of nanoparticles on the thermal resistance of cementitious composites. The review provides an updated report on the effects of temperature on the properties of cement-based composites, as well as a detailed analysis of the available literature regarding the inclusion of nanomaterials and their effects on the thermal degradation of cementitious composites. The data from the studies reviewed indicate that the inclusion of nanoparticles in composites protects from strength loss, as well as contributing to a decrease in disruptive cracking, after thermal exposure. From all the nanomaterials presented, nanosilica has been studied the most extensively. However, there are other nanomaterials, such as carbon nanotubes, graphene oxide, nanoclays, nanoalumina or nano-iron oxides, that can be used to produce heat-resistant cementitious composites. Based on the data available, it can be concluded that the effects of nanomaterials have not been fully explored and that further investigations are required, so as to successfully utilize them in the production of heat-resistant cementitious composites.

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The Effect of TiO2 Doped Photocatalytic Nano-Additives on the Hydration and Microstructure of Portland and High Alumina Cements

Cited by 17 publications

References 47 publications

Effect of TiO2 Addition on Mortars: Characterization and Photoactivity

Effect of TiO2 Addition on Mortars: Characterization and Photoactivity

Recent Progress in the Abatement of Hazardous Pollutants Using Photocatalytic TiO2-Based Building Materials

The Influence of Nanomaterials on the Thermal Resistance of Cement-Based Composites—A Review

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