Influencing factors analysis and optimized prediction model for rheology and flowability of nano-SiO2 and PVA fiber reinforced alkali-activated composites

Zhang, Peng; Gao, Zhen; Wang, Juan; Guo, Jinjun; Wang, Ting‐Ya

doi:10.1016/j.jclepro.2022.132988

Cited by 63 publications

(17 citation statements)

References 66 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It is the use of such technological methods as thermal and alkaline activation that made it possible to achieve high performance. Fresh properties of the developed alkali-activated materials correspond to similar characteristics of geopolymer composites prepared from previously studied precursors [ 42 ].…”

Section: Resultsmentioning

confidence: 86%

Structural Formation of Alkali-Activated Materials Based on Thermally Treated Marl and Na2SiO3

et al. 2022

View full text Add to dashboard Cite

Modern materials science is aimed towards abandoning Portland cement in the production of building materials. The scientific novelty of this study lies in its being the first time a comprehensive study of the structure formation of alkali-activated materials (AAM) based on thermally treated marl and Na2SiO3 is carried out. The tasks for achieving this goal were to characterize the thermally treated marl as a new binder, and to comprehensively research the microstructure, fresh, physical, and mechanical properties of the AAM based on the binder. Received active particles of marl with a smaller size than Portland cement have a specific surface area of 580–590 m2/kg. The mineral composition of heat-treated marl is characterized by calcium silicates, which guarantee good binding properties. The results of X-ray diffraction analysis of the samples based on the clinker-free binder of alkaline activation using opoka-like marl confirmed the presence of calcite, quartz, and feldspar close to albite, micas, and zeolites. The obtained products of the chemical interaction of the components of the binder confirm the effectiveness of the newly developed AAM. As a result of comparing several binders, it was found that the binder “thermally treated marl—Na2SiO3” is the most effective, since for specimens based on it, a maximum compressive strength of 42.6 MPa, a flexural strength of 4.6 MPa, and minimum setting time were obtained (start 26 min, end 32 min) as well as a water absorption of 10.2 wt.%. The research results will be of interest to specialists in the construction industry, since the proposed recipes for clinker-free cements are an alternative to expensive and energy-intensive Portland cement and provide the creation of strong and durable concrete and reinforced concrete composites.

show abstract

Section: Resultsmentioning

confidence: 86%

Structural Formation of Alkali-Activated Materials Based on Thermally Treated Marl and Na2SiO3

et al. 2022

View full text Add to dashboard Cite

show abstract

“…The decrease in the slump of RAC occurs primarily owing to the high absorption of RA. The higher water absorption decreases the quantity of mortar, which affects the slump [53,54]. Therefore, reducing the water absorption of RA can reduce the decrease in the workability of RAC.…”

Section: Influence Of Ra On the Workability Of Concretementioning

confidence: 99%

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

Zhang¹,

Wang²,

Zheng³

et al. 2023

Journal of Renewable Materials

View full text Add to dashboard Cite

Using recycled aggregate (RA) and slag instead of natural aggregate (NA) and cement can reduce greenhouse gas emissions (GHGE) and achieve effective waste recovery. In recent years, RA has been widely used to replace NA in concrete. Every year, several researchers conduct investigations on the mechanical performance and durability of recycled aggregate concrete (RAC). Due to the loose and porous material properties of RA, the mechanical properties and durability of RAC, such as strength, carbonation resistance, permeability resistance and chloride ion penetration resistance, are greatly reduced compared with natural aggregate concrete. In contrast, concrete containing slag instead of NA and cement generally improved the strength of concrete and reduced the internal porosity of materials. Herein, we discuss the effects of RA and slag on the workability, compressive strength, splitting tensile strength, ultrasonic pulse velocity (UPV) value, and elastic modulus of concrete. The relationships between the compressive strength and the splitting tensile strength, UPV value, and elastic modulus are discussed, and the optimal substitution method is proposed. In addition, various equations for calculating the compressive strength of concrete based on performance factors related to the compressive strength are summarized.

show abstract

“…Combined with the unique nucleation effect of nano-SiO 2 , it has a significant optimization effect on the internal microscopic defects of concrete. However, the content of nano-SiO 2 is not linearly related to the improvement effect of concrete [13][14][15]. Since the slump of concrete will also decrease significantly after adding nano-SiO 2 , combined with the characteristics that nano-SiO 2 particles are not easy to disperse inside the concrete and considering the inconsistency between test conditions and materials, the current recommendations for the optimal dosage of nano-SiO 2 are also inconsistent to a certain extent [16,17], so the research on the optimal dosage in concrete remains limited.…”

Section: Introductionmentioning

confidence: 99%

The Counterbalance of the Adverse Effect of Abrasion on the Properties of Concrete Incorporating Nano-SiO2 and Polypropylene Fiber Based on Pore Structure Fractal Characteristics

et al. 2022

Self Cite

View full text Add to dashboard Cite

Abrasion damage is a typical hydraulic structure failure and considerably impacts the durability of buildings. In severe circumstances, it can even prevent hydraulic structures from being used and operated normally. Thus, it is essential to research abrasion-resistant hydraulic systems that are more durable, inexpensive, safe, and ecologically friendly, given its unavoidable characteristics. In this context, five dosages of nano-SiO2 and three dosages of fibers are selected to evaluate and analyze the modification effect of nano-SiO2 and polypropylene fibers on the abrasion resistance of concrete. The evolution of the concrete properties was characterized based on the abrasion resistance strength. Moreover, the mineralogical composition and microstructure characterization were investigated through X-ray diffraction and scanning probe microscope. Mercury intrusion porosimetry was applied to determine the pore-structure parameters of concrete, such as pore-size distribution and the fractal characteristics. The results indicate that nano-SiO2 improves the abrasion resistance of concrete by densifying the pore structure and promoting the formation of hydration products. Results reveal that the excessive dosage of fibers agglomerates in the concrete to form an unsubstantial pore structure due to poor dispersibility. The fractal dimension of the pore structure exhibits a close relationship with the abrasion resistance strength of concrete. The implications of these findings inform the design of abrasion and erosion resistance for hydraulic engineering structures.

show abstract

Influencing factors analysis and optimized prediction model for rheology and flowability of nano-SiO2 and PVA fiber reinforced alkali-activated composites

Cited by 63 publications

References 66 publications

Structural Formation of Alkali-Activated Materials Based on Thermally Treated Marl and Na2SiO3

Structural Formation of Alkali-Activated Materials Based on Thermally Treated Marl and Na2SiO3

Effect of Recycled Aggregate and Slag as Substitutes for Natural Aggregate and Cement on the Properties of Concrete: A Review

The Counterbalance of the Adverse Effect of Abrasion on the Properties of Concrete Incorporating Nano-SiO2 and Polypropylene Fiber Based on Pore Structure Fractal Characteristics

Contact Info

Product

Resources

About