Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

Khan, Kaffayatullah; Ahmad, Waqas; Amin, Muhammad; Nazar, Sohaib

doi:10.3390/nano12121989

Cited by 56 publications

(23 citation statements)

References 177 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Results from this research are in agreement with previous studies on concrete specimens conducted by (Tobón et al, 2015) which found that adding 3% Nano silica resulted in up to a 63% reduction in expansion when compared to a control specimen (Khan et al, 2022). It also showed that a lower replacement amount of Nano silica was useful for increasing concrete resistance to sulphate.…”

Section: Resultssupporting

confidence: 91%

“…While useful, it does not offer special protection against attack on the hydrated calcium silicate (CSH) cement matrix or calcium hydroxide produced from the hydration of cement (Bensted et al, 2007). Cement possesses superior mechanical characteristics but it has been unable to meet the standards of durability (Khan et al, 2022). When exposed to geothermal good condition attacks are still deterred by chemical sulphate attacks.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Investigation of Performance of Nano Silica Cement Additive on Sulphate Attack In Geothermal Wells

Luswata¹,

Onyancha²,

Thuo³

2023

AJAR

View full text Add to dashboard Cite

Purpose: This research was intended to evaluate Nano silica as an additive to improve the sulphate resistance of cement used in geothermal wells. Design/ Methodology/ Approach: Sulphate resistance was determined by measuring the longitudinal change in cement cube specimens that were cured in sodium sulphate solution for 21 days. Cube specimens with varied concentrations of Nano silica (0%, 0.3%, 0.6%, 0.9% and 1.2%) were used in the study. Five separate solutions were maintained at 23℃, 40℃, 65℃, 70℃ and 80℃ for 21 days. Final length measurements were taken and compared as a percentage of initial length measurements. Findings: Beyond 65℃, the sulphate resistance of cement improved for each percentage concentration of Nano silica replacement. Control specimens with 0% Nano silica had the most inferior performance at all temperatures. Higher concentrations of 1.2% and 0.6% Nano silica replacement gave the most resistance between 23℃ and 65℃. A lower concentration of 0.3% proved more suitable between 65℃ and 80℃. Research limitation: The results of the experiment indicate performance in low-temperature geothermal wells. Practical implications: The application of this additive can improve the durability and strength of the cement, reducing the potential for degradation due to exposure to sulphates. This can lead to a longer lifespan of the geothermal well, reducing maintenance costs and increasing its overall efficiency. Social implications: Improved cement designs that create longer-lasting cement sheaths can be developed from this research, thereby fostering geothermal energy development. The option to replace certain volumes of cement with Nano silica contributes to a reduction of the carbon footprint by minimising the demand for, and therefore the production of cement. Originality/ Value/ Novelty: Previous research that tested cement at high temperatures analysed mechanical resistance. This research examined the sulphate resistance of cement at high temperatures.

show abstract

Section: Resultssupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Investigation of Performance of Nano Silica Cement Additive on Sulphate Attack In Geothermal Wells

Luswata¹,

Onyancha²,

Thuo³

2023

AJAR

View full text Add to dashboard Cite

show abstract

“…The emission of CO 2 from the manufacturing of Portland cement is nearly 5 to 7% of the worldwide release of carbon dioxide [ 1 , 2 , 3 , 4 ], which has detrimental impacts on the world’s response to environmental protection [ 5 ]. Hence, environmental activists and concerned officials in different nations have been inspiring the cement sector to decrease its release of carbon dioxide [ 6 , 7 , 8 ]. There are two methods of reducing the utilization of cement, the 1st is the usage of blended cement, and the 2nd is the usage of alkali-activated granulated blast furnace slag (GBFS) [ 9 ], rice husk ash (RHA) [ 10 ], fly ash (FA) [ 11 ], palm ash [ 4 , 12 , 13 ], or any other material with rich aluminosilicates [ 14 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Alkali-Activated Slag-Based Composite Incorporating Dehydrated Cement Powder and Red Mud

et al. 2023

View full text Add to dashboard Cite

Recycled construction cementitious materials (RCCM) and red mud (RM) could be considered a type of discarded material with potential cementitious properties. Generally, landfilling and stacking are utilized to dispose of this type of solid waste, which can be detrimental to the environment and sustainability of the construction sector. Accordingly, a productive process for making eco-efficient alkali-activated slag-based samples with the inclusion of RCCM and red mud is studied in this paper. Dehydrated cement powder (DCP) is attained through the high-temperature treatment of RCCM, and red mud can be obtained from the alumina industry. Subsequently, DCP and RM are utilized as a partial substitute for granulated blast furnace slag (GBFS) in alkali-activated mixtures. Two different batches were designed; the first batch had only DCP at a dosage of 15%, 30%, 45%, and 60% as a partial substitute for GBFS, and the second batch had both DCP and RM at 15%, 30%, 45%, and 60% as a partial substitute for GBFS. Different strength and durability characteristics were assessed. The findings show that when both dehydrated cement powder and red mud are utilized in high quantities, the strength and durability of the specimens were enhanced, with compressive strength improving by 42.2% at 28 days. Such improvement was obtained when 7.5% each of DCP and RM were added. The results revealed that DCP and RM have a negative effect on workability, whilst they had a positive impact on the drying shrinkage as well as the mechanical strength. X-ray diffraction and micro-structural analysis showed that when the amount of DCP and RM is increased, a smaller number of reactive products forms, and the microstructure was denser than in the case of the samples made with DCP alone. It was also confirmed that when DCP and RM are used at optimized dosages, they can be a potential sustainable binder substitute; thus, valorizing wastes and inhibiting their negative environmental footprint.

show abstract

“…Conventional concrete is one of the most widely used building materials in the world [ 1 , 2 , 3 ]. It is considered a complex substance, which is a mixture of fine and coarse aggregates coupled with a cementitious matrix that is suspended in the air [ 4 , 5 , 6 ]. However, fresh concrete without enough flowability makes casting, pumping, spreading, and molding around steel reinforcement extremely difficult [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Predicting the Rheological Properties of Super-Plasticized Concrete Using Modeling Techniques

et al. 2022

Self Cite

View full text Add to dashboard Cite

Interface yield stress (YS) and plastic viscosity (PV) have a significant impact on the pumpability of concrete mixes. This study is based on the application of predictive machine learning (PML) techniques to forecast the rheological properties of fresh concrete. The artificial neural network (NN) and random forest (R-F) PML approaches were introduced to anticipate the PV and YS of concrete. In comparison, the R-F model outperforms the NN model by giving the coefficient of determination (R2) values equal to 0.92 and 0.96 for PV and YS, respectively. In contrast, the model’s legitimacy was also verified by applying statistical checks and a k-fold cross validation approach. The mean absolute error, mean square error, and root mean square error values for R-F models by investigating the YS were noted as 30.36 Pa, 1141.76 Pa, and 33.79 Pa, respectively. Similarly, for the PV, these values were noted as 3.52 Pa·s, 16.48 Pa·s, and 4.06 Pa·s, respectively. However, by comparing these values with the NN’s model, they were found to be higher, which also gives confirmation of R-F’s high precision in terms of predicting the outcomes. A validation approach known as k-fold cross validation was also introduced to authenticate the precision of employed models. Moreover, the influence of the input parameters was also investigated with regard to predictions of PV and YS. The proposed study will be beneficial for the researchers and construction industries in terms of saving time, effort, and cost of a project.

show abstract

Nano-Silica-Modified Concrete: A Bibliographic Analysis and Comprehensive Review of Material Properties

Cited by 56 publications

References 177 publications

Investigation of Performance of Nano Silica Cement Additive on Sulphate Attack In Geothermal Wells

Investigation of Performance of Nano Silica Cement Additive on Sulphate Attack In Geothermal Wells

Investigation of Alkali-Activated Slag-Based Composite Incorporating Dehydrated Cement Powder and Red Mud

Predicting the Rheological Properties of Super-Plasticized Concrete Using Modeling Techniques

Contact Info

Product

Resources

About