Effects of particle characteristics of lightweight aggregate on mechanical properties of lightweight aggregate concrete

He, Yan; Xiong, Zhang; Zhang, Yongjuan; Zhou, Yufen

doi:10.1016/j.conbuildmat.2014.07.043

Cited by 53 publications

(20 citation statements)

References 30 publications

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“…A recent study by He et al [30] concluded that the interfacial roughness of LWAs has a significant effect on the mechanical performance of mortar. The smoother outer layers of FA and LECAs could explain the lower-than-expected strength of FA and LECA aggregates and higher-thanexpected strength of MT aggregates.…”

Section: Discussionmentioning

confidence: 99%

Development and incorporation of lightweight waste-based geopolymer aggregates in mortar and concrete

Yliniemi

Paiva

Ferreira

et al. 2017

Construction and Building Materials

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Section: Discussionmentioning

confidence: 99%

Development and incorporation of lightweight waste-based geopolymer aggregates in mortar and concrete

Yliniemi

Paiva

Ferreira

et al. 2017

Construction and Building Materials

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“…The first microcracks resulting from me- chanical or hydrothermal actions will appear in this zone. In term of hydration products, previous studies showed that calcium hydroxides (Portlandite) is mainly crystallizing in the ITZ with a preferential orientation weakening the ITZ (Ollivier et al 1995;Tang et al 2015;He et al 2014;Gao et al 2018). Ollivier et al (1995) also observed a very significant increase in Ca/Si ratio of hydrated cement paste in the ITZ (up to 6) compared to that of the bulk matrix (around 3) due to both excess in Portlandite and low C-S-H content.…”

Section: Microstructural Characterisation Of Itzmentioning

confidence: 93%

Mitigating the Risk of Early Age Cracking in Fly Ash Blended Cement-Based Concrete Using Ferronickel Slag Sand

Nguyen

Khan

et al. 2019

ACT

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A concrete mix (FNS25) including 50% natural sand replacement by ferronickel slag (FNS) sand and 25% ordinary portland cement (OPC) substitution by fly ash (FA) was considered to mitigate the risk of early-age cracking in fly ash blended cement-based concrete. Experiments were carried out to accurately quantify early-age shrinkage and tensile creep and assess their influence on early-age cracking in reinforced concrete members. The results show the free shrinkage strain is not influenced by either fly ash or FNS significantly, whereas the tensile creep of FNS25 is significantly larger than that of both OPC100 and FA20. Both restrained ring test and simulations on reinforced concrete members confirm that partly replacing conventional sand by FNS sand reduces the risk of early-age cracking. Microstructural analysis of the Interface Transition Zone (ITZ) of FNS sand shows that excess in Portlandite is absent in FNS sand ITZ leading to a higher early-age tensile strength of FNS25 concrete.

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“…In equation (6), M(r \ d i )/M T represents the cumulative percentage of undersize rock when the particle size is smaller than a characteristic size. The value of this term can be determined via a sieve test.…”

Section: Mass Fractal Model For Particle Size Distributionmentioning

confidence: 99%

Evaluation of particle size distribution of granular blasting materials based on the fractal theory

Yao

et al. 2019

Advances in Mechanical Engineering

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The particle size distribution of granular blasting materials has a vital influence on the filling quality of earth-rockfill dams. The engineering experience-based method used to evaluate the particle size distribution has shortcomings at both the theoretical and practical aspects. This article proposes a new evaluation method based on the fractal theory. Grading sieve tests on granular materials, mass fractal analysis of particle size distribution, and a probability distribution model test of the characteristic parameters are used to revise the functional relationships between the fractal dimension D and the uniformity coefficient/curvature coefficient ( Cu/ Cc) of the grading curve. The feasibility of using D to evaluate the particle size distribution and the optimal fine grain content is then analyzed and determined. According to the results, the geometric shapes of the granular blasting materials have fractal characteristics, and their particle size distribution has a fractal distribution. The ranges of D where the rockfill and transition materials have a good particle size distribution are D = 2.254–2.529 and D = 2.358–2.559, corresponding to optimal fine grain content of 1.953%–11.805% and 10.268%–23.123%, respectively. Fractal dimension has a solid theoretical basis and strong practical applicability as an evaluation index for the particle size distribution of granular blasting materials.

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Effects of particle characteristics of lightweight aggregate on mechanical properties of lightweight aggregate concrete

Cited by 53 publications

References 30 publications

Development and incorporation of lightweight waste-based geopolymer aggregates in mortar and concrete

Development and incorporation of lightweight waste-based geopolymer aggregates in mortar and concrete

Mitigating the Risk of Early Age Cracking in Fly Ash Blended Cement-Based Concrete Using Ferronickel Slag Sand

Evaluation of particle size distribution of granular blasting materials based on the fractal theory

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