Research into Carbon Dioxide Curing’s Effects on the Properties of Reactive Powder Concrete with Assembly Unit of Sulphoaluminate Cement and Ordinary Portland Cement

Cao, Hui; Zhao, Liang; Peng, Xi; Cai, Xin; Wang, Kewei; Wang, Hui; Lyu, Zhongda

doi:10.3390/coatings12020209

Cited by 16 publications

(5 citation statements)

References 35 publications

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“…The first one breaks down over time, and the second one breaks down with ambient temperatures. New phases formed instead of Са(ОН) 2 play a significant role in the formation of the structure of the cement stone, as their breakdown in some cases reduces the strength [4].…”

Section: Research Conditions and Methodsmentioning

confidence: 99%

Energy Saving Factors in Winter Concreting

Brzhanov

SADUEVA

Курбанмагомедов

et al. 2022

jour

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This article considers energy-saving technologies for winter concreting of building structures and constructions. Various authors have studied mathematical models of the thermal regime of a three-dimensional building structure. The mathematical model of the heat balance equations in the concrete structure, the thermal conductivity coefficient, the dependences of the heat balance equations in the concrete structure and the junction, the thermal conductivity coefficient, the volumetric thermal conductivity, respectively, in the erected fragment and the previously erected part of the wall was implemented on a computer. The article considers the processes of cement and concrete strength gain during early freezing of concrete. In previous studies by various authors, it was found that with an increase in the time for gaining critical strength, the cost of electricity is reduced by 25-50%, due to the use of thermal inertia of the structure. The rate of cooling of monolithic structures at negative temperatures is revealed. The chemistry of cement hardening processes during early freezing is shown. Thermodynamic calculations set the limits of negative temperatures at which concrete strength curing stops, but under the action of repeated positive temperatures, the cement hydration process resumes and concrete continues to harden. The aluminum minerals of Portland cement clinker are usually the first to hydrate when the cement hardens with water, and in the presence of gypsum they form calcium hydrosulfoaluminate. This connection is very fragile and is destroyed by mechanical stress (repeated vibration) and over time even at normal temperatures. The article reviews the foreign experience of winter concreting and the preferred methods of work in this case.

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Section: Research Conditions and Methodsmentioning

confidence: 99%

Energy Saving Factors in Winter Concreting

Brzhanov

SADUEVA

Курбанмагомедов

et al. 2022

jour

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“…Results showed that 10% limestone substitution improves concrete's properties (Tu et al, 2018). However, there are a few research studies on the CO2 curing of RPCs (Cao et al, 2022), where they considered the combination of 10% CO2 and 90% air as the carbonation curing media. Therefore, CO2 curing of RPCs is investigated in this study, where waste limestone powder was substituted as silica sand.…”

Section: Co2 Curing Of…mentioning

confidence: 99%

CO2 Curing of Reactive Powder Concretes Modified by Waste Limestone Powder

Rahmani,

Mohammadzade

2023

JJCE

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Incorporating waste stone powders into the production of reactive powder concretes (RPCs) can be eco-friendly. Since high cementitious material content is used in producing RPCs, CO2, as a harmful greenhouse gas, was used for carbonation curing in this study. For this purpose, waste limestone powder was substituted by 0%, 18%, 36% and 54% of silica sand and the specimens were cured in water for up to 90 days in a CO2 chamber for up to 48 hours. The physical and mechanical properties of the concrete and the specimens' CO2 uptake were measured at different ages. Results showed that the 28-day compressive strength of the moist cured RPCs was higher than 100 MPa and the properties of the RPCs were improved by increasing limestone substitution. CO2 curing of the RPCs significantly increased the samples' compressive strength and limestone-powder substitution as silica sand significantly decreased the carbonation and autogenous shrinkages of the RPCs. Moreover, carbonation curing can make eco-friendly limestone-modified RPCs, where their properties are improved. KEYWORDS: CO2 curing, Reactive powder concrete, Waste limestone powder, Shrinkage.

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“…CO 2 curing on building materials provides ideas for its absorption [7]. Additionally, prior research pointed out that CO 2 curing can effectively improve the mechanical strengths and the durability of cement-based materials [8,9]. Moreover, as described in some journals [10], the drying shrinkage rate of cement-based materials is decreased by CO 2 curing.…”

Section: Introductionmentioning

confidence: 99%

Improvement of CO2-Cured Sludge Ceramsite on the Mechanical Performances and Corrosion Resistance of Cement Concrete

et al. 2022

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The application of CO2 curing on sludge ceramsite may improve its mechanical properties, and then increase the corresponding corrosion resistance. In this study, the influence of CO2-cured sludge ceramsite on the strength and long-term properties of cement concrete is investigated. CO2 curing time ranges from 0 h to 2 d. The cylinder compressive strength and water absorption rate of CO2-cured sludge ceramsite are first determined. Additionally, the flexural and compressive strengths, the chloride permeability and the freeze—thaw damage, as well as the corresponding thermal conductivity of cement concrete, are tested. Furthermore, the corrosion resistance of reinforcement inner-sludge-ceramsite cement concrete is measured. Finally, the scanning electron microscope photos of sludge ceramsite are obtained. Results show that the cylinder compressive strength of CO2-cured sludge ceramsite is 15.1, ~34.2% higher than that of sludge ceramsite. Meanwhile, the water absorption rate of CO2-cured sludge ceramsite is 39.6, ~82.4% higher than that of sludge ceramsite. The compressive strength and the flexural strength of cement concrete with CO2-cured sludge ceramsite are 11.4 and 18.7, ~21.6% and ~31.5% higher than the cement concrete with sludge ceramsite, respectively. The resistance of NaCl freeze—thaw cycles, determined by comparing the mass loss rate and the loss rates of mechanical strengths, is effectively improved by CO2 curing, while the thermal conductivity of cement concrete is decreased by CO2 curing. The corrosion resistance of inner reinforcement is improved by the application of CO2 curing on sludge ceramsite.

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Research into Carbon Dioxide Curing’s Effects on the Properties of Reactive Powder Concrete with Assembly Unit of Sulphoaluminate Cement and Ordinary Portland Cement

Cited by 16 publications

References 35 publications

Energy Saving Factors in Winter Concreting

Energy Saving Factors in Winter Concreting

CO2 Curing of Reactive Powder Concretes Modified by Waste Limestone Powder

Improvement of CO2-Cured Sludge Ceramsite on the Mechanical Performances and Corrosion Resistance of Cement Concrete

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