Study on microstructure and mechanical property of interfacial transition zone between limestone aggregate and Sialite paste

Zhang, Jixiu; Sun, Hongjuan; Wan, Jianhua; Yi, Zhihua

doi:10.1016/j.conbuildmat.2009.06.037

Cited by 32 publications

(13 citation statements)

References 13 publications

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“…That is consistent with the above results of crushing index. Therefore, the crack or damage of concrete would cross the spontaneous combustion gangue aggregates directly but bypassed the natural aggregates in the splitting tensile test, which is similar with other studies [12,16]. The cross-section morphologies of concrete are showed in Fig.…”

Section: Fig 4 Loading Equipment For Testsupporting

confidence: 71%

“…In the west, some developed countries firstly carried on comprehensive utilization of gangue, until the late 1960s, wide attention was caused all over the world [3]. Some studies have shown that spontaneous combustion gangue can be utilized in concrete as aggregates [4][5][6][7][8][9][10][11][12], only needing to crush and screen. Aggregates take up about 70% volume of concrete, compared to other ways to apply spontaneous combustion gangue, it is reasonable, efficient and green way for gangue utilization in building materials field, and its economic and environmental benefits are also quite remarkable.…”

Section: Introductionmentioning

confidence: 99%

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Study on Flexural Properties of Reinforced Spontaneous Combustion Gangue Concrete Beams

Wang

Zhou

2017

Period. Polytech. Civil Eng.

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Section: Fig 4 Loading Equipment For Testsupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

Study on Flexural Properties of Reinforced Spontaneous Combustion Gangue Concrete Beams

Wang

Zhou

2017

Period. Polytech. Civil Eng.

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“…In ICP ion dissolution testing, the group of hydroxyl ions with NaOH solution has a chemical reaction on the fine material on the surface of the SiO2 and Al2O3 activity component. Therefore, the set of coal gangue in material active substances are distributed in the surface, internal active substance does not participate in the chemical reaction, the same calcination temperature, the same table area of coal gangue in the material with the same ion dissolution ability, and the quality of the fine aggregates.According to the literature[27,28], different calcining temperatures of coal gangue are used in the NaOH solution. The Si 4+ and Al 3+ ion dissolution characteristics of the strength and cement mortar are consistent with the variation of coal gangue calcined temperature.…”

mentioning

confidence: 99%

Activity of calcined coal gangue fine aggregate and its effect on the mechanical behavior of cement mortar

Dong

Xia

Fan

et al. 2015

Construction and Building Materials

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In order to reveal the influence of coal gangue aggregate activity on the mechanical properties of the mortar, to promote coal gangue fine aggregate in concrete mortar application, this paper in view of the calcined coal gangue aggregate carried out ion dissolution test (ICP), construction of the coal gangue aggregate ion dissolution amount and its surface area ratio as a quantitative index of activity, namely activity index of Ka. The different fineness modulus, different curing age of concrete mortar carried out compressive strength and flexural strength test, and the hardening of cement mortar combined with microscopic test results, in order to analyze the influence of coal gangue aggregate activity on the mechanical performances of mortar. Experimental results show that, under the same calcination temperature and surface area of coal gangue fine aggregate with the same ion dissolution ability, coal gangue fine aggregate index activity increases with the gradual decrease of fineness modulus. A higher activity index of coal gangue fine aggregate mortar corresponds to higher compressive strength and flexural strength of mortar in the improved macro mechanical properties; the early strength of mortar has clear characteristics.

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“…Similarly, Sun et al [32] found that concrete structure has more pores and micro-cracks than buck paste at the ITZ region through SEM imaging, transport simulation, and hydration modelling analyses. Moreover, Jixiu et al [31] also experimentally found that mineral additives included in HPC are effective in improving strength at the interfacial transition zone. Likewise, in determining the suitability of IC in improving heat cured concrete, Nie et al [33] found that IC substantially improved both the ITZ as well as the microstructure with less porosity.…”

Section: • Improved Interfacial Transition Zone (Itz)mentioning

confidence: 98%

“…The interfacial transition zone (ITZ) between mineral aggregates is largely recognized as the weaker region within a concrete matrix. Jixiu et al [31] note that, at inception of hydration, the region nearest to the aggregate has average, less cement strains and is normally filled with water and pores. They also pointed out that concrete usually experiences stress concentration at the interfacial transition zone owing to different elastic ratios between aggregate and bulk cement paste resulting to micro cracks and macro cracks in concrete on load application.…”

Section: • Improved Interfacial Transition Zone (Itz)mentioning

confidence: 99%

Awareness and Benefits of Self-Curing Concrete in Construction Projects: Builders and Civil Engineers Perceptions

et al. 2018

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Self-cured concrete is a type of concrete with a special ability to reduce autogenous shrinkage responsible for early-stage cracking. It is useful generally for the construction of high rise buildings and bridges. The application and use of this technique of curing concrete, however, depends on the level of awareness among stakeholders regarding the application of the technique and its benefits among other factors. This study, therefore, sets out to investigate the level of awareness of selected construction professionals regarding the self-curing concrete technique in addition to the benefits. A cross-sectional survey design method was embraced by giving out 115 questionnaires to builders and engineers in Lagos who were purposely selected. The data was subjected to descriptive statistics. The results indicate that about 21% of selected builders and civil engineers practicing in Lagos are not aware and familiar with the concept of self-curing technology while about 43.1% of the professionals who have the knowledge of SCT have never used it in their professional practice. In addition, lower permeability, reduced coefficients of thermal expansion, and improved microstructures of cementitious paste were perceived as the dominant benefits of the self-curing concrete method. The implication of this study to construction professionals in Nigeria is in developing capacities on innovation practices in high-strength concrete technologies that will make them strike a balance with international counterparts.

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Study on microstructure and mechanical property of interfacial transition zone between limestone aggregate and Sialite paste

Cited by 32 publications

References 13 publications

Study on Flexural Properties of Reinforced Spontaneous Combustion Gangue Concrete Beams

Study on Flexural Properties of Reinforced Spontaneous Combustion Gangue Concrete Beams

Activity of calcined coal gangue fine aggregate and its effect on the mechanical behavior of cement mortar

Awareness and Benefits of Self-Curing Concrete in Construction Projects: Builders and Civil Engineers Perceptions

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