Effect of Elevated Temperatures on Properties of Blended Cements with Clinoptilolite

Beycioğlu, Ahmet; Aruntaş, Hüseyin Yılmaz; Gençel, Osman; Lobland, Haley E. Hagg; Şamandar, Ayhan; Brostow, Witold

doi:10.5755/j01.ms.22.4.13354

Cited by 8 publications

(5 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Portland cement-based mortars with 45% or 10% clinoptilolite substitution have compressive strength exceeding 42.5 MPa after being subjected to 400°C and 500°C. 20 One of the eco-friendly compositions prepared from a mixture of polypropylene fibers, porcelain, and blast furnace slag as a cement replacement displays excellent fire resistance. 21 Passive fire-protection compositions have been developed to insulate the load-bearing substrates from fire.…”

Section: Introductionmentioning

confidence: 99%

Modified xonotlite–type calcium silicate hydrate slabs for fire doors

Levinskas

Lukošiūtė

Baltušnikas

et al. 2018

Journal of Fire Sciences

Self Cite

View full text Add to dashboard Cite

Xonotlite-type calcium silicate hydrate slabs were examined under the thermal shock conditions in a solar furnace at the Plataforma Solar de Almeria which can reach a peak of 300 W/cm 2. We have studied the original slabs as well as those modified with a mixture of liquid sodium silicate including montmorillonite as thermal insulation materials for fire doors applications. The slabs were kept at 950°C for 1 h. We performed X-ray diffraction, thermogravimetry and differential scanning calorimetry analysis, scanning electron microscopy, Fourier transform infrared spectroscopy, and thermal conductivity measurements and determined N 2 adsorption/desorption isotherms. X-ray diffraction shows that during the thermal shock at 950°C xonotlite is converted to wollastonite. Specific surface areas of xonotlite slabs decrease due to release of crystalline water molecules. It is possible to maintain temperatures of the back door not exceeding 70°C while the front door is subjected to 950°C for 1-h time periods. The standard requires no more than 140°C at the back door.

show abstract

Section: Introductionmentioning

confidence: 99%

Modified xonotlite–type calcium silicate hydrate slabs for fire doors

Levinskas

Lukošiūtė

Baltušnikas

et al. 2018

Journal of Fire Sciences

Self Cite

View full text Add to dashboard Cite

show abstract

“…In earlier work on concretes we have included clinoptilolite [23], a natural mineral available among others in California and also around the shores of the Aegean Sea. Significant improvement of the compressive strength was found after such concretes were subjected to 400 °C or 500 °C treatments.…”

Section: Fig 2 Abrasive Weight Loss Resultsmentioning

confidence: 99%

Durability of Portland Concrete Containing Polymeric Fillers and Fly Ash

Brostow

Chetuya²,

Gençel³

et al. 2019

Self Cite

View full text Add to dashboard Cite

Portland concrete suffers in service brittle failure, extensive crack propagation, and wear rates increasing with time. In spite of all the effort expended, these problems persisted when we had started our project. We used several polymeric fillers and fly ash. Higher compressive moduli than the starting concrete are seen for some compositions, the highest for 5 % of one of the polymers + 5 % fly ash. The same composition has the lowest Taber abrasive wear loss. All composites show lower wear loss values than Portland concrete. After 25 days of acidic degradation in 4.0 molar aq. HCl, the starting Portland concrete suffers stronger degradation that our composites. Polymer swelling mitigates acidic degradation. Repetitive freeze-thaw cycles between 15oF and 85oF show disappearance of the deep voids present before the first cycle in our composites—but not in the Portland cement. While the use of fly ash mitigates contamination of the environment, it is the combination of fly ash with polymers which provides significantly improved properties - tribological, chemical and mechanical ones – of the Portland concrete.

show abstract

“…In order to correctly process information, neural networks have to undergo a training process during which the weights of synaptic connections are modified. In most cases, gradient optimization methods are used during the training process (the Levenbeg-Marquardt method of steepest descent, methods of variable metrics and conjugate gradients) [26]. A fuzzy inference system consists of a set of fuzzy rules, a database described by membership functions and an inference and aggregation mechanism.…”

Section: Methodsmentioning

confidence: 99%

Application of the Takaga-Sugeno neuro-fuzzy model for determining of engineering structures

Mrówczyńska

2019

MATEC Web Conf.

View full text Add to dashboard Cite

The objective of the paper is to show the role of geodetic monitoring and modern methods of measurement data processing with the use of neural-fuzzy systems in identifying changes occurring in engineering structures. Fast methods of measurement and data processing are of key importance whenever rapidly changing phenomena should be captured (e.g. deformations of buildings, fires spreading in forest areas, flood waves, landslides caused by endogenous and exogeonic factors). Processes and phenomena occurring in engineering structures can be modelled based on information obtained by geodetic monitoring. At present, elements of geodetic technologies are being supplemented with artificial intelligence methods, which include neuro-fuzzy systems. These systems can process information that is provided at the input both as numerical and linguistic values. This approach is used for qualitative assessment of the condition of objects and physical quantities and it is characterized by parallel information processing. The paper presents the possibility of using the Takaga-Sugeno neural-fuzzy model for prediction and assessment of horizontal and vertical displacements of engineering structures as illustrated by the example of a historical footbridge in Muskauer Park, located in Germany and Poland.

show abstract

Effect of Elevated Temperatures on Properties of Blended Cements with Clinoptilolite

Cited by 8 publications

References 15 publications

Modified xonotlite–type calcium silicate hydrate slabs for fire doors

Modified xonotlite–type calcium silicate hydrate slabs for fire doors

Durability of Portland Concrete Containing Polymeric Fillers and Fly Ash

Application of the Takaga-Sugeno neuro-fuzzy model for determining of engineering structures

Contact Info

Product

Resources

About