The Effect of Curing Temperature on the Properties of Cement Pastes Modified with TiO2 Nanoparticles

Teixeira, Karine Pimenta; Rocha, Isadora Perdigão; Carneiro, Leticia De Sá; Flores, Jessica; Dauer, Edward A.; Ghahremaninezhad, Ali

doi:10.3390/ma9110952

Cited by 44 publications

(13 citation statements)

References 53 publications

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“…Two interesting phenomena were observed, which are surprisingly similar to what has been reported as occurring in concrete [24]. The first one, is evident from Figure 9; greater the curing temperature, faster is the reactivity kinetics, which is known to be true for cement mixes as well [48]. The effect of temperature comes into play right from the end of the 'dormant period' of cement hydration and may be noticed after around two hours from the time of casting.…”

Section: Effect Of Curing Temperature On MIX 1c1l6ssupporting

confidence: 80%

Mechanical properties of lime–cement masonry mortars in their early ages

Ramesh

Azenha

2019

Mater Struct

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Lime-cement mortars are often used in restoration of existing buildings (especially twentieth century onward) as well as new constructions, in order to combine the individual strengths of either type of binder. Despite the knowledge that mortars have a significant impact on the non-linear mechanical behaviour of masonry from the earliest moments of construction, literature that systematically quantifies the impact of adding lime to cement mortars, or vice versa is scarce and scattered. This work is therefore focussed on bridging the research gap that exists in lime-cement masonry mortars with regard to their mechanical properties in the early ages (up to 7 days of curing). Five different mix compositions have been studied with 1:3 binder-aggregate ratio and 10% to 75% lime content in the binder, both by volume. Changes in properties like mechanical strength and stiffness along with ultrasound pulse velocity have been quantified, correlated and associated with change in quantity of lime in the binder (by volume) of the mortar. It was found that every 10% increase in the quantity of lime in the binder led to a 14% decrease in mechanical strength and a corresponding 12% decrease in stiffness, at 7 days of curing age. Emodulus was found to evolve faster than flexural strength, which in turn was found to evolve faster than compressive strength. Impact of curing temperature and the concept of activation energy has been addressed for the mix 1:1:6 (Cement: Lime: Sand).

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Section: Effect Of Curing Temperature On MIX 1c1l6ssupporting

confidence: 80%

Mechanical properties of lime–cement masonry mortars in their early ages

Ramesh

Azenha

2019

Mater Struct

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“…This phenomenon is called COE [44][45][46]. The scanning electron microscope (SEM) images of cement paste cured at room temperature and elevated temperature of 60• C at the ages of three and 28 days were studied by Teixeira et al [47] as shown in Figures 3 and 4, respectively. From the images, they observed more uniformly distributed hydration products in the cement pastes cured at room temperature than in the cement pastes cured at 60 • C. The observed that cement paste cured at room temperature had porous microstructure with uniformly distributed capillary pores at early age of three days.…”

Section: Coe and Mechanismmentioning

confidence: 99%

Crossover Effect in Cement-Based Materials: A Review

et al. 2019

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Cement-based materials (CBMs) such as pastes, mortars and concretes are the most frequently used building materials in the present construction industry. Cement hydration, along with the resulting compressive strength in these materials, is dependent on curing temperature, methods and duration. A concrete subjected to an initial higher curing temperature undergoes accelerated hydration by resulting in non-uniform scattering of the hydration products and consequently creating a great porosity at later ages. This phenomenon is called crossover effect (COE). The COE may occur even at early ages between seven to 10 days for Portland cements with various mineral compositions. Compressive strength and other mechanical properties are important for the long life of concrete structures, so any reduction in these properties is of great concern to engineers. This study aims to review existing information on COE phenomenon in CBMs and provide recommendations for future research.

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“…Addition of TiO 2 powder to cement mixes was found to significantly affect the hydration rate of cement and the properties of cement pastes and mortars. According to several authors [4,12,14,15,16], the early stage hydration rate and hydration degree of cement was significantly enhanced. Fluidity and strength at evening ages were found to decrease [17].…”

Section: Introductionmentioning

confidence: 99%

“…This leads the strength of cement mortar at early ages to increase a lot and the fluidity and strength at evening ages to decrease, obviously [17]. The workability and setting time of fresh mortar and concrete were decreased by increasing the content of TiO 2 nanoparticles [12,14,15,16,17,18,19]. These aspects were consistently reported in even higher concentrations of TiO 2 up to 15 wt % at the early stage of C 3 S hydration.…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Oxides Mitigation Efficiency of Cementitious Materials Incorporated with TiO2

et al. 2018

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We explored the photocatalytic capacities of cementitious materials (cement paste and mortar) incorporating titanium dioxide (TiO2). P-25 is a commercial TiO2 preparation which, if incorporated into large civil buildings, is extremely expensive. It is essential to produce low-cost TiO2. A cheap anatase form of TiO2 powder, NP-400, manufactured under relatively low burning temperature, was considered in this paper. Addition of NP-400 to 0, 5, 10, and 20 wt % did not significantly affect the compressive strengths of mortar or cement paste. However, the compressive strengths of P-25-containing specimens were more consistent than those of NP-400-containing materials. The nitrogen oxide (NO) removal efficiencies by mortar with 5 and 10 wt % TiO2 were similar at ca. 14–16%; the removal efficiency by mortar with 20 wt % NP-400 was ca. 70%. Although the NP-400 cluster size was almost halved by ultrasonication, NO removal efficiency was not enhanced. Removal was enhanced by the presence of accessible surface area: NP-400 dispersed in these surfaces readily adsorbed NO, aided by the large surface areas of the top and bottom faces. Scanning electron microscopy coupled with energy dispersive X-ray analysis (SEM–EDX) confirmed that NP-400 tended to sink when added to cement, fine aggregates, and water because the true densities of P-25, NP-400, and cement powder differed (3.41, 3.70, and 3.15 g/mL). The true density of NP-400 was thus the highest of all ingredients. The relatively low apparent density of P-25 compared to that of NP-400 was associated with a more bulky distribution of P-25 within cementitious materials. Nevertheless, NP-400 could be a viable alternative to the definitive product, P-25.

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The Effect of Curing Temperature on the Properties of Cement Pastes Modified with TiO2 Nanoparticles

Cited by 44 publications

References 53 publications

Mechanical properties of lime–cement masonry mortars in their early ages

Mechanical properties of lime–cement masonry mortars in their early ages

Crossover Effect in Cement-Based Materials: A Review

Nitrogen Oxides Mitigation Efficiency of Cementitious Materials Incorporated with TiO2

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