Effect of pozzolanic micro and nanoparticles as secondary fillers in carbon nanotubes/cement composites

Reales, Oscar Aurelio Mendoza; Carisio, Pedro Almeida; Santos, Thaís Carvalho dos; Pearl, William C.; Filho, Romildo Dias Tolêdo

doi:10.1016/j.conbuildmat.2021.122603

Cited by 16 publications

(4 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The reason is that the role of slag with lower reactivity mainly is to fill the voids and compact the matrix during the early hydration process. The slag can be activated by alkali solution and Ca(OH) 2 at late age [11,45]. In the meantime, the secondary hydration of slag will improve the formation of C-S(A)-H gel with a low Ca/Si ratio, and also contribute to the development of compressive strength and the volume stability [46].…”

Section: Effect Of Cement Contentmentioning

confidence: 99%

Long-term (2 years) drying shrinkage evaluation of alkali-activated slag mortar: Experiments and partial factor analysis

Wang

Yang

et al. 2023

Case Studies in Construction Materials

View full text Add to dashboard Cite

Section: Effect Of Cement Contentmentioning

confidence: 99%

Long-term (2 years) drying shrinkage evaluation of alkali-activated slag mortar: Experiments and partial factor analysis

Wang

Yang

et al. 2023

Case Studies in Construction Materials

View full text Add to dashboard Cite

“…The hydration products of CSA were mainly AFt, AH 3 , and less CH (Equations ( 1) and ( 2)) [18]. However, on the one hand, the content of CH was low due to the small content of the silica phase, and on the other hand, CH was more likely to be consumed during hydration, as shown in Equation (3) [19][20][21]. The alkalinity of CSA was low, and it had poor resistance to carbonation.…”

Section: Introductionmentioning

confidence: 99%

The Effect of CH on Improving the Carbonation Resistance of OPC-CSA Binary Blends

Yang

Zhang

2023

Materials

View full text Add to dashboard Cite

Due to the large amount of CO2 generated during steelmaking, to resume production as soon as possible, a fast repair material with good carbonation resistance is needed to repair the factory building. First, the performance of an ordinary Portland cement (OPC)-calcium sulfoaluminate cement (CSA) system under an accelerated carbonization environment was studied. Next, the OPC-CSA system with a CSA content of 15 wt% was selected to be modified by adding calcium hydroxide (CH). The findings showed that the addition of 15 wt% CSA to the OPC-CSA system resulted in the highest mechanical properties. Specifically, the flexural strength and compressive strength after 84 d of carbonization were 18% and 15% higher, respectively, compared to those of OPC alone. The degradation of the mechanical properties of the OPC-CSA system due to carbonation was improved by adding CH. The flexural strength (3.0 wt% CH) and the compressive strength (4.5 wt% CH) of the OPC-CSA-CH system after 84 d of carbonization were 13% and 5% higher, respectively, than those of the OPC-CSA system. The addition of CH increased the alkalinity of the OPC-CSA system and enhanced the stability of Aft, resulting in better carbonation resistance in the OPC-CSA-CH system.

show abstract

“…Many scholars have carried out a large number of experimental studies on the dispersion of nanoclay. Dry mixing [17], surfactant formation [18], and ultrasonic dispersion [19] are adopted to improve the distribution of nanoclay in cement and promote the application of nano clay in cement concrete. As a nanomaterial, the effectiveness of NC is highly dependent on the dosage and method of dispersion.…”

Section: Introductionmentioning

confidence: 99%

Study on Shrinkage Cracking Morphology of Cement Mortar with Different Nanoclay Particles under Restraint

et al. 2022

View full text Add to dashboard Cite

In this paper,different types and particle sizes of nanoclay(nano-metakaolin—NMK—and nano-attapulgite—NMA—clay) were selected to study the effect of nanoclay on the properties of cement-based cementitious materials. The stability of different nanoclay dispersions wasanalyzed. The effects of nanoclay on the mechanical properties and cracking behavior of cement mortar were discussed. The crack propagation behavior of nanoclay cement mortar was analyzed by flatknife-edge induced constraint and ring constraintexperiments. The research shows that the degree of aggregation of NMA particles is lower than that of NMK. The larger the particle size of NMA, the lower the degree of particle aggregation. The larger the particle size of NMK, the lower the degree of particle aggregation in water.NMK has the best improvement effect on cement mortar. The smaller the particle size, the more pronounced the improvement effect. The flexural strength ratio, compressive strength ratio, and elastic modulus ratio of 7d and 28d are 76.7%, 67.4%, and 61.2%, respectively. In the flat plate cracking experiment, the maximum crack width of NMK-3 and NMA-2 was reduced by 33.3% and 25.0%, respectively, compared withordinary cement mortar. The maximum crack length was reduced by 55.1% and 33.1% compared with cement mortar. In the ring constraintexperiment, the total cracked area of NMK-1, NMA-1, NMK-3, and NMA-2 rings increased by 64.3%, 45.0%, 92.7%, and 49.7%, respectively, compared with ordinary cement mortar rings after 60 days. NMK can advance the cracking time of cement mortar, but it can inhibit the generation and development of cracks and refine the crack width.

show abstract

Effect of pozzolanic micro and nanoparticles as secondary fillers in carbon nanotubes/cement composites

Cited by 16 publications

References 31 publications

Long-term (2 years) drying shrinkage evaluation of alkali-activated slag mortar: Experiments and partial factor analysis

Long-term (2 years) drying shrinkage evaluation of alkali-activated slag mortar: Experiments and partial factor analysis

The Effect of CH on Improving the Carbonation Resistance of OPC-CSA Binary Blends

Study on Shrinkage Cracking Morphology of Cement Mortar with Different Nanoclay Particles under Restraint

Contact Info

Product

Resources

About