Influence of TiO&lt;sub&gt;2&lt;/sub&gt; and Fly ash on Fracture Parameters of Concrete Notched Beams

Pathak, Sudhanshu; Vesmawala, Gaurang R.

doi:10.3151/jact.20.624

Cited by 12 publications

(4 citation statements)

References 40 publications

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“…On the other hand, it should be noted that FA has a great potential to be used as a partial replacement for OPC, especially due to its physicochemical properties [80], fine grain size [81] and quite good pozzolanic activity [82]. Therefore, the problem of effective use of this by-product of coal combustion in cement binder technology and in concrete technology has been the subject of numerous studies for many years [83][84][85]. Therefore, experiments and analyses are carried out regarding the properties of cement composites with FA as a replacement for cement part-using both the most commonly used, i.e.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, experiments and analyses are carried out regarding the properties of cement composites with FA as a replacement for cement part-using both the most commonly used, i.e. siliceous FA [85][86][87], and other FA varieties meeting the requirements of standards and suitable for use as SCMs, e.g. calcaerous FA, fluidised-bed FA or bottom ash [88,89].…”

Section: Introductionmentioning

confidence: 99%

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Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

Golewski

2023

Mater. Res. Express

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The studies were carried out to find a relation between important physical property and the main mechanical parameter of concretes containing fly ash (FA) in order to develop indications for the production of durable composites with the addition of this waste. The tests included low volume fly ash concrete (LVFAC). The cements used in the studies were following: ordinary Portland cement (OPC), (FA-00) and two blended Portland cements containing FA in the amount of: 20%, (FA-20) and 30% (FA-30). Measurements of water adsorption (wa) by immersion and compressive strength (fcm) of analysed composites have been performed. The methodology of the wa tests was to reflect the conditions prevailing in the case of concrete- and reinforced concrete structures operating below the water table. The microstructure of all three materials was also assessed. Test results indicated that LVFAC mixes developed 28-day fcm between 45.10 for FA-30 to 48.96 MPa for FA-20 with a value of 47.51 MPa for the reference concrete. Neverless wa of LVFAC mixes decreased with the increase in FA content. The average values of wa was 4.6% for FA-30 and 5.3% for FA-20, respectively, while for concrete without FA it was 5.0%. Thus, it was found that wa by immersion was inversely proportional to the fcm. Based on the microstructural studies it was found that this behavior is attributed to reduced pore diameters and densification of cement matrix microstructure in FA-30 concrete. On the other hand concrete of series FA-20 showed a loose and porous microstructure, and wa in this composite increased accordingly. It can be stated that, the LVFAC containing 30% FA may increase durability of reinforced concrete structures subjected to immersion conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

Golewski

2023

Mater. Res. Express

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“…However, like any other material, RC can be susceptible to cracking (Golewski, 2023). It's worth noting that cracks in concrete and RC structures are quite common and can be considered a natural feature of concrete, even an integral part of its structure (Akram, 2021;Pathak and Vesmawala, 2022). Cracks in RC structures can lead to a deterioration in their strength, stability, and durability.…”

Section: Introductionmentioning

confidence: 99%

Injection of Cracks in a Rc Beam With Epoxy Resin Using the Gravity Flow Method

Klym,

Blikharskyy

2023

Theory build. pract.

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The restoration of the load-bearing capacity of RC beams through crack injection is one of the most efficient and practical methods for executing repairs in the field of civil engineering. In the article, following an analysis of crack injection methods in RC structures, an economically viable method for injecting RC beams is proposed. The core approach of the proposed crack injection method involves the process of introducing epoxy resin into the crack, which occurs by gravity flow (without specialized equipment and pressure). The paper outlines a systematic process for preparing the crack in the RC beam for epoxy resin injection. The crack injection method was conducted comprehensively, including the restoration of the compressed concrete zone within the RC beam. The test results demonstrated the effectiveness of the crack injection method, as there were no new crack formations at the injection sites, and the load-bearing capacity of the RC beam was restored to 115%.

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“…On the other hand, it should be noted that CFA has great potential to be used as a partial replacement for OPC, especially due to its physicochemical properties [43], fine grain size [44], and quite good pozzolanic activity [45]. Therefore, the problem of the effective use of this by-product of coal combustion in cement binder technology and concrete technology has been the subject of numerous studies for many years [46][47][48].…”

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confidence: 99%

The Effect of the Addition of Coal Fly Ash (CFA) on the Control of Water Movement within the Structure of the Concrete

Golewski

2023

Materials

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Studies were carried out to find a relation between the important physical property, i.e., water absorption and the main mechanical parameter, i.e., compressive strength (fcm), of concretes containing coal fly ash (CFA) in the amounts of 0% (CFA-00), 20% (CFA-20%), and 30% (CFA-30). The methodology of the water absorption tests reflected the conditions prevailing in the case of reinforced concrete structures operating below the water table. The microstructure of all materials was also assessed. Based on the conducted studies, it was found that both the fcm of concretes with the addition of CFA and its water absorption depended on the percentage of waste used, whereas both analyzed parameters were closely related to the structure of the cement matrix and interfacial transition zone area between the coarse aggregates and the paste. It should be stated that at the content of 20% CFA in the binder composition, an increase in the fcm of the material is observed, with a simultaneous increase in its water absorption. On the other hand, the addition of 30% CFA results in a significant decrease in both the strength of the composite and its water absorption. Thus, it was found that in the case of concretes with the addition of CFA, the strength of the material is directly proportional to the level of its water absorption. Moreover, the concrete including 30% CFA may increase the durability of reinforced concrete structures subjected to immersion conditions. From an application point of view, the obtained research results may be helpful in understanding the impact of the CFA additive on the level of water absorption in cement concretes with this waste.

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Influence of TiO<sub>2</sub> and Fly ash on Fracture Parameters of Concrete Notched Beams

Cited by 12 publications

References 40 publications

Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

Examination of water absorption of low volume fly ash concrete (LVFAC) under water immersion conditions

Injection of Cracks in a Rc Beam With Epoxy Resin Using the Gravity Flow Method

The Effect of the Addition of Coal Fly Ash (CFA) on the Control of Water Movement within the Structure of the Concrete

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