Physical and mechanical properties of concrete repair materials in dry and hot-dry environment

Belaïdi, Akram Salah Eddine; Benabed, Benchaa; Soualhi, Hamza

doi:10.1080/01694243.2014.998001

Cited by 12 publications

(6 citation statements)

References 14 publications

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“…[34,35] For this purpose, several solutions can be proposed to counter these imbalances; this can be achieved through corrections in concretes or mortar composition.…”

Section: Effect Of Extra Water and Super Plasticizer On The Scc Crackingmentioning

confidence: 99%

The influence of bleeding, extra water and superplasticizer on the SCC plastic shrinkage cracking: case of hot weather

Yakoubi

Aggoun

Aider

et al. 2016

Journal of Adhesion Science and Technology

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a laboratory of experimental and numerical Modelling of Materials and structures in civil engineering (laMoMs), university Mouloud Mammeri of Tizi ouzou, Tizi ouzou, algeria; b l2Mgc, cergy-Pontoise university, cergy-Pontoise, france; c laboratory of Materials and durability of constructions (lMdc), university Mentouri of constantine, constantine, algeria ABSTRACT Self-compacting concrete (SCC) is a new material able to be put in place without vibration. However, this advantage is offset by some drawbacks, such as plastic shrinkage, one of the causes of cracking in concrete. Furthermore, the presence of fines absorbs a large amount of water and therefore minimizes bleeding. This paper endeavours to provide a better understanding of the appearance of plastic shrinkage cracking, and to justify his relation with bleeding phenomena. Five SCC formulas with different W/C ratios were prepared and compared to the same range of ordinary concrete (OC) in terms of restrained shrinkage (cracking width). At the same time, a study of cracks' propagation over time (cracking length) was conducted on the equivalent mortars (mOCe, mSCCe). Mixtures were placed in different hot environmental conditions. The results showed that bleeding significantly reduces cracking length and has no effect on cracking width. In the second part, extra water and superplasticizer was proposed as a solution to prevent SCC cracking and findings show the addition of 10% of water reduces cracking length and a slightly lower addition of superplasticizer reduces SCC's crack width.

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“…[34,35] For this purpose, several solutions can be proposed to counter these imbalances; this can be achieved through corrections in concretes or mortar composition.…”

Section: Effect Of Extra Water and Super Plasticizer On The Scc Crackingmentioning

confidence: 99%

The influence of bleeding, extra water and superplasticizer on the SCC plastic shrinkage cracking: case of hot weather

Yakoubi

Aggoun

Aider

et al. 2016

Journal of Adhesion Science and Technology

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“…Effect of PZ addition on CEM rheological parameters Figures 3 and 4 show natural pozzolana effect on CEM rheological behavior and the workability and flow time respectively. Note that the addition of 5% PZ, 10% PZ and 15% PZ in the cement matrix improved the rheological parameters [1]. However, beyond 15%, pozzolana increased mortars yield stress and the viscosity seems to be due to pozzolana angular shape.…”

Section: Effect Of Natural Pozzolanamentioning

confidence: 88%

“…This is especially important when attaching special importance to the influence of mineral additions and temperature. Numerous studies (Belaidi et al [1], Dada et al [2], Cassagnabere et al [3] present cement substitution effect by these mineral additions on workability and their influence on the rheological behavior. Escalante-Garcia et al [4] have confirmed that there are several mechanisms of mineral additions action that induce changes in cement paste rheology or concrete rheology.…”

Section: Introductionmentioning

confidence: 99%

Coupled Effect of temperature and additions on the rheological behavior of concrete equivalent mortars (CEM)

Dada

Belaidi

Soualhi³

et al. 2020

MATEC Web Conf.

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The aim of this work is to study the influence of mineral additions on the rheological behavior of low impact environmental concrete with its concrete equivalent mortar (CEM) at different temperatures.The experimental study is carried out on cement-based CEM substituted by two additions namely, natural pozzolana (PZ) and marble powder (PM), with a substitution rate of 5 to 20%, a ratio of water on binder E / L = 0.5 and a percentage of superplasticizer based on polycarboxylates SP = 0.30%. The rheological parameters, the workability and the flow time of the mixtures were tested by a coaxial rheometer, a mini cone and the LCPC maniabilitimetre respectively at 10 ° C, 20 ° C and 30 ° C. The results show that the substitution of cement by natural pozzolana and marble powder in binary system generally improved viscosity and yield stress at 20°C and 30°C, while at 10°C natural pozzolana negatively affected the rheological parameters and workability.

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“…The widespread risk of environmental degradation reinforces the installation of wireless and non-wireless electrochemical sensors for real-time corrosion monitoring. The corrosion of steel, concrete reinforcements, and degradation of plastic materials remain a complex challenge in farm environments, despite the development of advanced methods of passivation [ 70 , 71 ], cathodic protection [ 72 , 73 ], galvanizing, corrosion inhibition [ 74 ] and fiber-reinforced polymers for preventing corrosion [ 75 ], and development of metal stabilizers and UV absorbers to limit the impact of UV radiation [ 12 ]. The failure of existing mitigation methods could be due to the frequency of exposure.…”

Section: Sensors For Health Monitoring Of Agricultural Structuresmentioning

confidence: 99%

Sensors for Structural Health Monitoring of Agricultural Structures

Maraveas

Bartzanas

2021

Sensors

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The health diagnosis of agricultural structures is critical to detecting damages such as cracks in concrete, corrosion, spalling, and delamination. Agricultural structures are susceptible to environmental degradation due to frequent exposure to water, organic effluent, farm chemicals, structural loading, and unloading. Various sensors have been employed for accurate and real-time monitoring of agricultural building structures, including electrochemical, ultrasonic, fiber-optic, piezoelectric, wireless, fiber Bragg grating sensors, and self-sensing concrete. The cost–benefits of each type of sensor and utility in a farm environment are explored in the review. Current literature suggests that the functionality of sensors has improved with progress in technology. Notable improvements made with the progress in technology include better accuracy of the measurements, reduction of signal-to-noise ratio, and transmission speed, and the deployment of machine learning, deep learning, and artificial intelligence in smart IoT-based agriculture. Key challenges include inconsistent installation of sensors in farm structures, technical constraints, and lack of support infrastructure, awareness, and preference for traditional inspection methods.

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Physical and mechanical properties of concrete repair materials in dry and hot-dry environment

Cited by 12 publications

References 14 publications

The influence of bleeding, extra water and superplasticizer on the SCC plastic shrinkage cracking: case of hot weather

The influence of bleeding, extra water and superplasticizer on the SCC plastic shrinkage cracking: case of hot weather

Coupled Effect of temperature and additions on the rheological behavior of concrete equivalent mortars (CEM)

Sensors for Structural Health Monitoring of Agricultural Structures

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