Influence of the granular skeleton packing density on the static elastic modulus of conventional concretes

Klein, Nayara Soares; Lenz, Lauri Anderson; Mazer, Wellington

doi:10.1016/j.conbuildmat.2020.118086

Cited by 30 publications

(4 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The CPPM assumes that all particles follow a specific size distribution and thus the gaps among the particles are minimized. Klein, Lenz, and Mazer 16 adopted a particle packing method (PPM) in concrete mix design, and found that increasing dry packing density of the aggregates by around 9% could increase the 7‐day Young's modulus of concrete by 21%. However, the effect of PPM on the workability and other mechanical properties of concrete has not been widely reported.…”

Section: Introductionmentioning

confidence: 99%

Effects of aggregate packing optimization and cement paste volume on the properties of natural and recycled aggregate concrete

Jiang

Shu

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

This paper investigates the influence of aggregate packing optimization based on a particle packing method (PPM) and cement paste volume (CPV) on the workability and mechanical properties of both natural aggregate concrete (NAC) and recycled aggregate concrete (RAC). The slump, compressive strength, flexural strength and Young's modulus of concrete were first examined, followed with the characterization of macro-pore structure inside RAC by using X-ray computed tomography (CT). The results indicate that the PPM can help to densify the granular skeleton of aggregates in concrete by reducing the void around the aggregates and the cement paste film thickness, and subsequently enhances the mechanical properties of the concrete with a constant CPV. This enhancement is higher for RAC than NAC, particularly for the Young's modulus. The particle packing optimization can also decrease the number of macro pores in RAC, contributing to the enhancement in the mechanical properties of RAC. Moreover, increasing CPV in concrete with a maximum aggregate packing status considerably decreases the mechanical properties of concrete, whereas increases its workability. This is mainly caused by the increased number of macro pores in the cement paste and at the interfaces between RCAs and hardened cement paste.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of aggregate packing optimization and cement paste volume on the properties of natural and recycled aggregate concrete

Jiang

Shu

et al. 2021

Structural Concrete

View full text Add to dashboard Cite

show abstract

“…Subsequently, the destruction of particles with a high degree of crystallinity occurs. Obtaining a more uniform granulometric composition of finely dispersed fillers is preferable for dense packing of particles of a high-strength concrete matrix and preferably in compositions with a decrease in the proportion of cement [33].…”

Section: Innovations and Technologies In Constructionmentioning

confidence: 99%

Microstructural Analysis of Changes in the Morphology of Quartz Raw Materials of Different Genesis at Dry Milling

Фомина

Kozhukhova

Belovodsky

et al. 2021

MSF

View full text Add to dashboard Cite

The influence of the genesis of quartz-containing rocks on the strength of particles and changes in morphology during destruction from the standpoint of the mineralogical approach in the development of the scientific direction "geonics" ("geomimetics") has been investigated. The kinetics of dry grinding of raw materials in a laboratory ball roller mill was carried out. The features of the formation and development of cracks, particle size distribution, changes in the morphology and microstructure of fragments have been studied. It was found that in natural quartz cracks develop along the surface, where the highest concentration of impurities creates a defect structure with destruction into small particles. The purest structure of hydrothermal quartz is susceptible to brittle fracture into fragments similar in morphology to the base particle. Reducing the defectiveness of the structure increases the strength of the crystals. The internal energy potential of techno genic raw materials is determined by its defective structure, which undergoes the greatest deformations during grinding, allowing obtaining the maximum values of the specific surface area and reduce the grinding time. A difference in the degree of crystallinity of quartz, which composes the polymineral techno genic raw materials, makes it possible to obtain the optimal granulometry of fine particles. The conducted research is aimed at identifying the mechanisms of destruction of quartz rocks and can be used in solving engineering problems not only in construction materials science, but also in geotechnics.

show abstract

“…KLEIN, LENZ e MAZER [27] investigaram a influência do empacotamento de agregados no módulo de elasticidade estático de concretos com resistência à compressão entre 25 e 40 MPa. Concluíram que o empacotamento produziu um aumento médio no módulo de elasticidade estático do concreto de 21% em 7 dias e 8% em 28 dias.…”

Section: Introductionunclassified

Efeitos da forma e do módulo de elasticidade dos agregados graúdos, dos parâmetros de dosagem e suas interações sobre o módulo de elasticidade do concreto

Santos,

Molin,

Isaia

et al. 2022

Matéria (Rio J.)

View full text Add to dashboard Cite

RESUMO Este estudo avaliou a influência das diferentes variáveis (teor de pasta, relação a/c, forma e módulo de elasticidade do agregado graúdo) e suas interações, sobre o módulo de elasticidade estático do concreto de cimento Portland. Foram fixados três teores de pasta (24,7%, 19,8% e 16,5%), três relações água/cimento (0,38, 0,48 e 0,58), mediu-se o módulo de elasticidade das quatro rochas selecionadas (basalto, diabásio, calcário e granito), para o basalto e o diabásio utilizou-se três formas de agregado graúdo (com beneficiamento, intermediário e sem beneficiamento), e para o calcário e granito apenas uma forma (sem beneficiamento). Após a seleção e estudo dos diferentes materiais utilizados para a produção dos concretos, foram produzidas diferentes misturas para avaliação da resistência à compressão e módulo de elasticidade, ambos medidos aos 28 dias de idade do concreto. As interações entre as variáveis apresentaram influências sobre o módulo de elasticidade do concreto, porém a variável teor de pasta, de primeira ordem, apresentou o maior impacto, em todas as situações analisadas. Portanto, os resultados confirmaram que todas as variáveis avaliadas e suas interações possuem influência significativa sobre o módulo de elasticidade do concreto.

show abstract

Influence of the granular skeleton packing density on the static elastic modulus of conventional concretes

Cited by 30 publications

References 15 publications

Effects of aggregate packing optimization and cement paste volume on the properties of natural and recycled aggregate concrete

Effects of aggregate packing optimization and cement paste volume on the properties of natural and recycled aggregate concrete

Microstructural Analysis of Changes in the Morphology of Quartz Raw Materials of Different Genesis at Dry Milling

Efeitos da forma e do módulo de elasticidade dos agregados graúdos, dos parâmetros de dosagem e suas interações sobre o módulo de elasticidade do concreto

Contact Info

Product

Resources

About