Modeling with ANN and effect of pumice aggregate and air entrainment on the freeze–thaw durabilities of HSC

Karakoç, Mehmet Burhan; Demirboğa, Ramazan; Türkmen, İbrahim; Can, İbrahim

doi:10.1016/j.conbuildmat.2011.04.068

Cited by 28 publications

(21 citation statements)

References 28 publications

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“…[1][2][3][4][5][6][7] Regarding the use of a porous aggregate for cement composites, very interesting and significant findings were published in study. 8 Here, the research focuses on the contact zone (or surface transition zone) of the porous aggregates and the cement matrix.…”

Section: Introductionmentioning

confidence: 77%

Changes in the composite structure and parameters after an exposure to a synergic action of various extreme conditions

Melichar¹,

Dufka²,

Bydžovský³

2017

Mater. tehnol.

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The research presented in this paper is aimed at studying the properties of composites designed for a redevelopment of reinforced concrete structures where it is possible to expect an increased risk of fire, i.e., shock actions of extreme temperatures. Such conditions may occur, for example, in transport constructions, particularly in tunnels. We have developed two recipes (formulas) for materials based on a polymer-cement matrix and a porous filler. These materials were subjected to cyclic freezing and de-freezing in combination with a water action. In terms of a long-term durability, we monitored the characteristics after 50 and 100 cycles. The impact of an increased humidity was not considered in this phase of the research. After testing the frost resistance, the bodies were dried up. Then, temperature shocks of (400, 600 and 1000)°C followed. The bodies were cooled down under control, with gradual temperature decreases. The reason for assessing the impact of these two exposure conditions on the properties of designed materials was mainly the use of the porous filler. This filler has a favourable effect on the temperature resistance. On the other hand, however, the frost resistance can be negatively affected in combination with water. Studying the influence of the above two exposures was carried out using the basic physico-mechanical and also physico-chemical methods. We also utilized analytical methods for assessing the microstructure. The structure was also examined using an innovative imaging technique allowing a three-dimensional visual assessment, which was primarily aimed at identifying faults of the structure. Keywords: composite, polymer-cement matrix, cementitious supplementary material, high temperature, frost resistance, synergic, microstructure Namen predstavljene raziskave je {tudij lastnosti kompozitov namenjenih obnovi betonskih zgradb, kjer je mo`no pri~akovati pove~ano nevarnost po`ara in delovanje ekstremnih temperatur. Taki pogoji se lahko pojavijo, na primer, v prometnih konstrukcijah, posebno v tunelih. Razvili smo dva recepta (formuli) materialov, ki temeljijo na me{anici polimer-cement in poroznega polnila. Ti materiali so bili izpostavljeni cikli~nemu zamrzovanju in odtajanju, v kombinaciji z delovanjem vode. V smislu dolge zdr`ljivosti, smo pregledali zna~ilnosti po 50 in 100 ciklih. Vpliv pove~anja vla`nosti v tem delu raziskav ni bil obravnavan. Po preizku{anju odpornosti na mraz, so bila telesa osu{ena. Sledili so temperaturni {oki na (400, 600 in 1000)°C. Telesa so bila kontrolirano ohlajena, s postopnim zmanj{anjem temperature. Razlog za ocenjevanje u~inka teh dveh pogojev izpostavitve na lastnosti materiala, je bila predvsem uporaba poroznega polnila. To polnilo ima ugoden vpliv na temperaturno obstojnost. Po drugi strani pa je lahko odpornost na zmrzal manj{a v kombinaciji z vodo. [tudij vpliva obeh na~inov izpostavitve je bil izveden z uporabo osnovnih fizikalno-mehanskih in tudi fizikalno-kemijskih metod. Za ocenjevanje mikrostrukture smo uporabili tudi analiti~ne metode. Str...

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Section: Introductionmentioning

confidence: 77%

Changes in the composite structure and parameters after an exposure to a synergic action of various extreme conditions

Melichar¹,

Dufka²,

Bydžovský³

2017

Mater. tehnol.

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“…However, the measured UPV values did not show the signs of internal damage. The operating time of the signal was reduced for all mixtures by the number of cycles attributable to the increasing higher order of saturation of all mixtures. After 200 freeze–thaw cycles UPV values decreased according to ASTM C 666 procedure A and B.…”

Section: Resultsmentioning

confidence: 99%

“…The connection of the pore structure may vary from fully closed to fully open, thus its behavior is different from the other LWA. Karakoc et al report that using fine PA (0–2 mm) by 10, 20, and 30% in replacement of sand, compressive strength, ultrasonic pulse velocity (UPV) and relative dynamic modulus of elasticity (RDEM) of samples decreased with increasing of pumice aggregate (PA) ratios. However, according to ASTM C666/C666M‐15 procedure B, the concrete with high strength after freezing and thawing at 100, 200, and 300 cycles is still durable.…”

Section: Introductionmentioning

confidence: 99%

The influence of lightweight aggregate, freezing–thawing procedure and air entraining agent on freezing–thawing damage

Karagöl

Yegin

Polat

et al. 2018

Structural Concrete

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This article presents the results of a study dealing with the concrete resistance to repeated cycles of freezing and thawing of nonair entrained, fine lightweight aggregate (LWA) and air‐entrained concrete when tested in accordance with ASTM C 666, procedures A and B. The water‐to‐binder ratios (w/b) of the mixtures ranged from 0.25 to 0.35, and the percentage of cement replacement by silica fume were 7% on a weight basis and constant throughout study. Binder dosage was 500 kg/m3 and constant. LWA was pumice aggregate (PA) and expanded perlite aggregate (EPA). PA and EPA were replaced by 10, 20, and 30% of total volume of 1 m3 as a fine aggregate (0–2 mm fine aggregate fraction). Also one group was produced with air entraining agent by 0.1% ratio of binder dosage. The 200 freeze–thaw cycles were carried out according to ASTM C666/C666M‐15, procedure A and B. The compressive strength, ultrasonic pulse velocity, relative dynamic modulus of elasticity and dry unit weight of mixtures were investigated. Based upon the analysis of the test data, it is concluded that samples contain air‐entrained agent and 10% LWA were more durable than that of control sample. With the increasing of the LWA content the freeze–thaw resistance of samples decreased. Thus, higher content of LWA is not recommended when it is to be subjected to repeated freeze–thaw cycles. Freezing–thawing procedures were compared with each other and found that procedure A was more severe than procedure B.

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“…Pumice is the most widely used natural lightweight aggregate [17]. It is a natural material of volcanic origin produced by the release of gases during the solidification of lava [18].…”

Section: Introductionmentioning

confidence: 99%

“…Pores ranging from hundreds of microns to a few microns are visible. e pores appear irregular in shape and well connected [17].…”

Section: Introductionmentioning

confidence: 99%

Chloride Penetration in Lightweight Aggregate Mortars Incorporating Supplementary Cementing Materials

Stratoura

Iaz

Badogiannis

2018

Advances in Civil Engineering

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The current research is aiming to investigate the chlorides’ penetration resistance of 9 different pumice lightweight aggregate mortars (LWAMs). The composition of the mixture is altered by the addition of metakaolin, fly ash, silica fume, and ground granulated blast furnace slag, substituting 10% and 20% of cement by mass. Workability and compressive strength of the mortars are studied together with durability parameters like water absorption due to capillary absorption and porosity. Moreover, the mortar resistance to chloride penetration is evaluated through non-steady-state chloride migration coefficient, complying to NT BUILD 492 standard. Summarizing all the laboratory test results, while the addition of metakaolin in the range of 20% led to better workability, higher compressive strength, lower sorptivity, and lower volume of open porosity, it did not improve the resistance against chlorides’ penetration.

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Modeling with ANN and effect of pumice aggregate and air entrainment on the freeze–thaw durabilities of HSC

Cited by 28 publications

References 28 publications

Changes in the composite structure and parameters after an exposure to a synergic action of various extreme conditions

Changes in the composite structure and parameters after an exposure to a synergic action of various extreme conditions

The influence of lightweight aggregate, freezing–thawing procedure and air entraining agent on freezing–thawing damage

Chloride Penetration in Lightweight Aggregate Mortars Incorporating Supplementary Cementing Materials

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