Investigation of internal curing effects on microstructure and permeability of interface transition zones in cement mortar with SEM imaging, transport simulation and hydration modeling techniques

Sun, Xiao; Zhang, Bin; Dai, Qingli; Yu, Xiong

doi:10.1016/j.conbuildmat.2014.12.014

Cited by 59 publications

(19 citation statements)

References 48 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Assuming that there was no experimental error when measuring the creep deformation of these specimens and since they were exposed to a dry environment (RH of 50%), it is possible that the greater water absorption capacity of these RA allowed lower creep strain values than those expected. Because the RA were water-compensated, water may have been released over time and thus contributed to an internal curing [95], which reduced the permeability of the ITZ section due to less percolated porosity and smaller characteristic pore sizes, when compared with specimens without internal curing [96]. This may have led to the production of specimens with stronger C-S-H microstructure thus preventing a nano-particle sliding under sustained loading [28].…”

Section: Replacement Level (%)mentioning

confidence: 99%

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Silva

Dhir

2015

Engineering Structures

View full text Add to dashboard Cite

Section: Replacement Level (%)mentioning

confidence: 99%

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Silva

Dhir

2015

Engineering Structures

View full text Add to dashboard Cite

“…Therefore, the selection of the appropriate material is a governing factor that could either improve or impede the process of internal curing and must be investigated by means of physical and chemical characterization. Aggregates with high porosity can maintain humid conditions in mixtures and compensate the loss of water due to evaporation and provide continuous water supply, thus preventing the cement from undergoing substantial self-desiccation [19].…”

Section: Internal Curing In Cementitious Compositesmentioning

confidence: 99%

Mechanical and Microstructure Properties of Biochar-Based Mortar: An Internal Curing Agent for PCC

Mrad

Chehab

2019

Sustainability

View full text Add to dashboard Cite

In pursuing sustainability targets, the construction industry has witnessed significant efforts exerted on exploring new alternatives for raw materials. Such initiatives aim to alleviate concerns of overexploitation of natural resources leading to their depletion. On a different note, the disposal of municipal solid waste (MSW) has also become a major concern in some countries, such as the case of Lebanon, where illegal dumping continues to take its toll on the environment. Pyrolysis has been introduced as a biomass decomposition process of MSW and is considered an environmentally friendly process that can mitigate open dumping. However, pyrolysis produces significant amounts of biochar as a byproduct that in turn needs to be disposed of or treated. This research aims to investigate the viability of using biochar as a sustainable alternative material to sand in cementitious mortar composites. A thorough microscale physicochemical characterization of the biochar is conducted prior to its inclusion in mortar. Then, its incorporation as a partial replacement of sand in mortar is assessed at the mesoscale level, based on performance indices that included compressive strength and microstructure properties. Analysis of the experimental results are used to provide guidelines and recommendations as to the effective incorporation of biochar fraction in cementitious mortar.

show abstract

“…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. 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.…”

Section: • Improved Interfacial Transition Zone (Itz)mentioning

confidence: 92%

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

et al. 2018

View full text Add to dashboard Cite

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.

show abstract

Investigation of internal curing effects on microstructure and permeability of interface transition zones in cement mortar with SEM imaging, transport simulation and hydration modeling techniques

Cited by 59 publications

References 48 publications

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Comparative analysis of existing prediction models on the creep behaviour of recycled aggregate concrete

Mechanical and Microstructure Properties of Biochar-Based Mortar: An Internal Curing Agent for PCC

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

Contact Info

Product

Resources

About