Liquid nitrogen effect on the fresh concrete properties in hot weathering concrete

Harith, Iman Kattoof; Hassan, Maan S.; Hasan, Shatha S.

doi:10.1007/s41062-021-00731-6

Cited by 20 publications

(4 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The increase in saline territories is explained by the drying up of the Aral Sea and the blowing out of a large amount of salt. Chemical additives primarily affect cement paste and stone's structure formation and properties [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Influence of compound additive on concrete in hot and dry climate

2023

View full text Add to dashboard Cite

In the conditions of hot and dry climate, the concrete mixture quickly loses its mobility and workability. In this regard, it is necessary to plasticize it by introducing various surfactants; at the same time, the surfactant additive should not slow down the process of hydration and hardening. To ensure salt resistance, it is necessary to increase the density and strength of concrete. The proposed complex additive is obtained by joint grinding in a ball mill of soda sulfate melt and gossypol resin to a specific surface of 2800 cm2/g at the rate of 0.5-1.5% and 0.1-0.3% by weight of cement. From the obtained results, it can be seen that with an increase in the content of gossypol resin from 0.1 to 0.3%, the normal density decreases by 1.4-4 points, and the setting time due to the accelerating action of the soda sulfate melt is reduced at the beginning by 20-50 minutes and the end by 60 - 240 min. Reference cement for 28 days gained a strength of 56 MPa, with a complex additive of 60-68 MPa. The coefficient of salt resistance of the reference 0.55-0.65 and with a complex additive of 0.80-0.86 is observed due to the strength and density of the samples. Increasing the strength makes it possible to save 17-21% of cement.

show abstract

Section: Introductionmentioning

confidence: 99%

Influence of compound additive on concrete in hot and dry climate

2023

View full text Add to dashboard Cite

show abstract

“…The cement industry is one of the major sources of pollution due to carbon dioxide (CO2) emissions due to the energy-intensive nature of cement production. The trend of gas emissions is evaluated as a tonne of CO2 per tonne of cement produced [1][2][3]. On the other hand, electric arc furnace steel slag (EAFS, abbreviated here as SS) and waste glass (WG) are the main by-products of human industrial activities.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Performance of Steel Slag and Waste Glass as a Cement Replacement

Azeez,

Hassan,

Atiyah

2023

ETJ

View full text Add to dashboard Cite

This work assessed the pozzolanic activity of locally available steel slag and waste glass in mortars.• Effects of steel slag and waste glass replacing cement on workability, density, and strength index are studied. • Unlike waste glass, steel slag decreased mortar strength and workability. • Steel slag improved compressive strength and mitigated the negative impact of waste glass in concrete.The industrial development and growth in population activity caused an annual increase in solid wastes over the past decades. The emissions of CO2 from the cement industry are the main source of air pollution. Recycling wastes as cementitious materials conserve the ecosystem in different aspects, e.g., reduction of CO2 footprint. Consequently, the pozzolanic activity of two solid wastes abundantly available in Iraq, steel slag (SS) and waste glass (WG), were evaluated. This study aimed to replace them with ordinary Portland cement. This will achieve a sustainable, eco-efficient, and environmentally friendly construction industry. The Chemical analysis of the wastes by XRF and XRD suggests a possible cementitious capability owing to the amorphous nature of WG and the presence of C3S and C2S in SS. Accordingly, due to international standards, cubic mortars were produced by replacing cement with SS at 50% and WG at 50% and 20%. The effects of such replacements on the compressive strength of mortars were evaluated by comparison with that of the control mortars. WG increases workability and results in a higher strength index (72.8%) than that of SS (48.7%) at similar replacement levels (50%). Subsequently, SS and WG replaced coarse aggregates (CA) and cement, respectively, in concrete. The results revealed positive effects of SS on compressive strength in contrast to WG influence. The compressive strength of concrete cured for 91d increased by about 20% compared to the control sample upon incorporation of 50% SS without any WG.

show abstract

“…Another method is to add dozes of liquid nitrogen to the mixture as illustrated by the ACI report [15]. As a cooler, liquid nitrogen LN was injected with the concrete mixing in order to improve the properties of fresh concrete [16,17]. However, several practical safety considerations should be considered during the transport of LN to cool concrete should be considered and used on the San Francisco-Oakland Bay Bridge project [18].…”

Section: Introductionmentioning

confidence: 99%

Pre-Cooling Concrete System in Massive Concrete Production: Energy Analysis and Refrigerant Replacement

et al. 2022

View full text Add to dashboard Cite

Several techniques for cooling mass concrete structures were developed in order to increase structural integrity and reduce the influence of cement hydration, which sometimes causes cracking in concrete structures, negatively affecting their durability. This research focuses on cooling system design, initial investment, and the influence of different refrigerants on cooling system performance aims in producing higher quality massive concrete. Cooling aggregates in massive concrete structures such as desert dams can be performed by employing cooled air from an air conditioning duct system or chilled water. The experimental study illustrates the relationship between the coefficient of performance COP, the evaporator temperature, cooling capacity, and refrigerant mass flow rate as a function of the evaporator temperature, cooling capacity, and refrigerant mass flow rate. The findings of the experiments were utilized to verify a numerical model developed utilizing engineering equation solver (EES) software. The performance of the vapor compression of the cooling systems was compared using alternative refrigerants, including R22, R32, and R410a at different operating conditions. This study revealed that R22 refrigerant has a higher coefficient of performance than R32 and R410A, while R32 has the highest cooling capacity among other refrigerants.

show abstract

Liquid nitrogen effect on the fresh concrete properties in hot weathering concrete

Cited by 20 publications

References 21 publications

Influence of compound additive on concrete in hot and dry climate

Influence of compound additive on concrete in hot and dry climate

Evaluation of the Performance of Steel Slag and Waste Glass as a Cement Replacement

Pre-Cooling Concrete System in Massive Concrete Production: Energy Analysis and Refrigerant Replacement

Contact Info

Product

Resources

About