Performance of nano silica-modified cementitious composites reinforced with basalt fiber pellets under alkaline and salt-frost exposures

Azzam, A.; Bassuoni, M. T.; Shalaby, Ahmed

doi:10.1016/j.cemconcomp.2022.104761

Cited by 7 publications

(8 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even though none of the pre-cracked samples experimented on by Azzam et al [56] did not fail under the alkaline exposure, the detrimental impact of salt-frost exposure was more significant in pre-cracked samples than in uncracked samples because of the salt solution's direct access inside the cracking surface. The uncracked samples expanded up to 0.013% following this exposure, unlike alkaline exposure, where the samples shrank on an average of 0.006%.…”

Section: Salt-frost Exposurementioning

confidence: 85%

“…Meanwhile, the percentage of the micro-pores fell by 15, 17, and 21%, respectively. These findings by Azzam et al [56] revealed that the salt solution and the concurrent activities of low or freezing temperatures prevented the development of microstructure to various degrees. The apparent coarser microstructure following this salt-frost exposure, integrity reduction with the pellets at the ITZ, and, therefore, the decrease in the toughness and flexural strength was caused by the internal micro-cracking of the matrix, as indicated in Figure 12.…”

Section: Salt-frost Exposurementioning

confidence: 90%

“…Hence, the acceptability of BFPs in NFRCC requires evaluation. Azzam et al [56] exposed the uncracked and pre-cracked NFRCC specimens with BFPs to alkaline environment exposure for six months after initial curing. The authors found that all the NFRCC samples remained intact after alkaline exposure.…”

Section: Alkaline Exposurementioning

confidence: 99%

“…Combined chemical and environmental loading through salt-frost exposure negatively affected the NFRCC. The durability of BFP-reinforced NFRCC specimens under salt-frost scaling was examined by Azzam et al [56]. The authors exposed the uncracked and pre-cracked NFRCC specimens with BFP to salt-frost exposure (508 thermal cycles) for six months after 56 days of initial curing.…”

Section: Salt-frost Exposurementioning

confidence: 99%

See 3 more Smart Citations

Utilization of Novel Basalt Fiber Pellets from Micro- to Macro-Scale, and from Basic to Applied Fields: A Review on Recent Contributions

Ahmed,

Bediwy,

Azzam

et al. 2024

Fibers

Self Cite

View full text Add to dashboard Cite

Fiber-reinforced cementitious composites (FRCC) are one of the leading engineering materials in the 21st century, as they offer proficiency in enhancing strength, ductility, and durability in structural engineering applications. Because the recently developed basalt fiber pellets (BFP) offer combined strands of fibers encased in a polymer matrix, they are being prevalently studied to explore new possibilities when used in brittle materials such as mortar and concrete. Hence, this paper synthesizes the intensive research efforts and contributions to this novel class of fibers conducted by the authors. Specifically, it reviews the fresh, mechanical, and durability properties of FRCC incorporating single BFP or hybrid with polyvinyl alcohol fibers and modified with slag/fly ash and nano-materials and its suitability for different field applications. In addition, the nano- and meso-scale modeling of such matrices are described. BFP significantly contributes to improving post-cracking flexural behavior by toughening the cementitious matrix and minimizing strength losses when exposed to harsh environments. All results show promising progress in the development of high-performance FRCC comprising BFP, with potential success for structural and pavement applications.

show abstract

Section: Salt-frost Exposurementioning

confidence: 85%

Section: Salt-frost Exposurementioning

confidence: 90%

Section: Alkaline Exposurementioning

confidence: 99%

Section: Salt-frost Exposurementioning

confidence: 99%

See 2 more Smart Citations

Utilization of Novel Basalt Fiber Pellets from Micro- to Macro-Scale, and from Basic to Applied Fields: A Review on Recent Contributions

Ahmed,

Bediwy,

Azzam

et al. 2024

Fibers

Self Cite

View full text Add to dashboard Cite

show abstract

“…Brittleness, exposure conditions, and loading configurations typically result in the initiation and propagation of cracks in concrete and consequently affect its overall performance and longevity. Hence, numerous studies have been conducted to introduce high-performance fiber-reinforced cementitious composites (HPFRCCs) in which fibers are a crucial component to control cracking and enhance ductility [1][2][3]. HPFRCC can be employed in a suite of infrastructure applications such as production of thinner and lighter structural elements, beam-column joints, retrofitting/strengthening of flexural sides of elements, topping of heavy-duty flatwork (e.g., pavements, bridge decks), etc.…”

Section: Introductionmentioning

confidence: 99%

Cementitious Composites with Cellulose Nanomaterials and Basalt Fiber Pellets: Experimental and Statistical Modeling

Hosny,

Yasien,

Bassuoni

et al. 2024

Fibers

View full text Add to dashboard Cite

The production of high-performance fiber-reinforced cementitious composites (HPFRCCs) as a durable construction material using different types of fibers and nanomaterials critically relies on the synergic effects of the two materials as well as the cementitious composite mixes. In this study, novel HPFRCCs were developed, which comprised high content (50%) slag by mass of the base binder as well as nano-silica (NS) or nano-crystalline cellulose (NCC). In addition, nano-fibrillated cellulose (NFC), and basalt fiber pellets (BFP), representing nano-/micro- and macro-fibers, respectively, were incorporated into the composites. The response surface method was used in this study’s statistical modeling part to evaluate the impact of key factors (NS, NCC, NFC, BFP) on the performance of 15 mixtures. The composites were assessed in terms of setting times, early- and late-age compressive strength, flexural performance, and resistance to freezing-thawing cycles, and the bulk trends were corroborated by fluid absorption, thermogravimetry, and microscopy tests. Incorporating NS/NCC in the slag-based binders catalyzed the reactivity of cement and slag with time, thus maintaining the setting times within an acceptable range (maximum 9 h), achieving high early- (above 33 MPa at 3 days) and later-age (above 70 MPa at 28 days) strength, and resistance to fluid absorption (less than 2.5%) and frost action (DF above 90%) of the composites. In addition, all nano-modified composites with multi-scale fibers showed notable improvement in terms of post-cracking flexural performance (Residual Strength Index above 40%), which qualify them for multiple infrastructure applications (i.e., shear key bridge joints) requiring a balance between high-strength properties, ductility, and durability.

show abstract

Use of cellulose nanomaterials in cementitious composites reinforced with basalt/polymer pellets for repair of concrete

Sadoon,

Hosny,

Bassuoni

et al. 2024

Construction and Building Materials

View full text Add to dashboard Cite

Performance of nano silica-modified cementitious composites reinforced with basalt fiber pellets under alkaline and salt-frost exposures

Cited by 7 publications

References 33 publications

Utilization of Novel Basalt Fiber Pellets from Micro- to Macro-Scale, and from Basic to Applied Fields: A Review on Recent Contributions

Utilization of Novel Basalt Fiber Pellets from Micro- to Macro-Scale, and from Basic to Applied Fields: A Review on Recent Contributions

Cementitious Composites with Cellulose Nanomaterials and Basalt Fiber Pellets: Experimental and Statistical Modeling

Use of cellulose nanomaterials in cementitious composites reinforced with basalt/polymer pellets for repair of concrete

Contact Info

Product

Resources

About