Influence of fine aggregates on the microstructure, porosity and chemico-mechanical stability of inorganic polymer concretes

Kamseu, Elie; Ponzoni, Chiara; Tippayasam, Chayanee; Taurino, Rosa; Chaysuwan, Duangrudee; Bignozzi, Maria Chiara; Barbieri, Luisa; Leonelli, Cristina

doi:10.1016/j.conbuildmat.2015.08.090

Cited by 22 publications

(20 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This could be justified by the fact that, if more fine powder of reactive mineral is added, the reactive phase also increases. The changes in microstructure observed in SEM images are in line with the findings of other authors [32,33,44] who used a secondary aluminosilicate source as alumina, metakaolin, pumice and feldspars to improve the physico-chemical properties of geopolymer binder from volcanic scoria and metakaolin, respectively. They concluded that, with the more reactive additive mineral included into these systems, a higher dissolution extent of raw materials in alkaline media has been observed, the amorphous binder phase increased with Si/Al ratio in the range of 1-2, resulting in the development of higher strength.…”

Section: Microstructuresupporting

confidence: 89%

Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials

Kaze

Venyite

Nana

et al. 2020

Materials Chemistry and Physics

Self Cite

View full text Add to dashboard Cite

show abstract

Section: Microstructuresupporting

confidence: 89%

Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials

Kaze

Venyite

Nana

et al. 2020

Materials Chemistry and Physics

Self Cite

View full text Add to dashboard Cite

show abstract

“…, they react essentially on the surface, during the dissolution, thus participating in the chemical-physical reactions typical of geopolymeric consolidation, reducing the volume of air voids and bubbles as generally observed in metakaolin-based inorganic polymer cement [ 15 , 19 ]. The role of fines in the reduction of pores volume has already been demonstrated by Kamseu et al [ 15 ]. The fines into the context of inorganic reactions are known to accelerate the hydration acting as nucleation sites for binding phases (C–S–H, C–(N)–A–S–H, N–A–S–H, etc. )…”

Section: Resultsmentioning

confidence: 99%

“…To evaluate the capability to help in the control of indoor humidity in buildings, the adsorption/desorption behavior of the AAS mortars was evaluated on two specimens aged 28 days per each formulation dried at room temperature for 24 h and then soaked in deionizer water for 24 h accordingly to previous studies [ 15 ]. Specimens of prismatic shape as those used for mechanical characterization were weighted in their saturated condition and the time of the first measurement was considered as t 0 .…”

Section: Methodsmentioning

confidence: 99%

Design of Inorganic Polymer Mortar from Ferricalsialic and Calsialic Slags for Indoor Humidity Control

Kamseu

Lancellotti

Modolo³

et al. 2016

Materials

Self Cite

View full text Add to dashboard Cite

Amorphous silica and alumina of metakaolin are used to adjust the bulk composition of black (BSS) and white (WSS) steel slag to prepare alkali-activated (AAS) mortars consolidated at room temperature. The mix-design also includes also the addition of semi-crystalline matrix of river sand to the metakaolin/steel powders. The results showed that high strength of the steel slag/metakaolin mortars can be achieved with the geopolymerization process which was particularly affected by the metallic iron present into the steel slag. The corrosion of the Fe particles was found to be responsible for porosity in the range between 0.1 and 10 µm. This class of porosity dominated (~31 vol %) the pore network of B compared to W samples (~16 vol %). However, W series remained with the higher cumulative pore volume (0.18 mL/g) compared to B series, with 0.12 mL/g. The maximum flexural strength was 6.89 and 8.51 MPa for the W and B series, respectively. The fracture surface ESEM observations of AAS showed large grains covered with the matrix assuming the good adhesion bonds between the gel-like geopolymer structure mixed with alkali activated steel slag and the residual unreacted portion. The correlation between the metallic iron/Fe oxides content, the pore network development, the strength and microstructure suggested the steel slag's significant action into the strengthening mechanism of consolidated products. These products also showed an interesting adsorption/desorption behavior that suggested their use as coating material to maintain the stability of the indoor relative humidity.

show abstract

“…The results showed that the porosity of each sample is greater than 90% and the variation in EVA content does not have a significant effect on porosity. On the other hand, Elie Kamseu et al, 2015 [19] have shown that semi-crystalline and amorphous polymers contribute to reducing porosity in concrete.…”

Section: Possible Explanation Of the Porosity And Mechanical Testing mentioning

confidence: 99%

The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement

Dakhli¹,

Chaffar²,

Lafhaj³

2019

Sci

View full text Add to dashboard Cite

When focusing on materials science in civil engineering, the current trend is to investigate the use of innovative solutions in order to enhance thermal and energy performances. This trend is amplified with the need for a sustainable development strategy for the construction sector. This paper assesses the integration of a Phase Change Material (PCM) in cement intended for building construction. The key characteristic of PCMs is their capacity to absorb energy and restore it. In building construction, this feature could be harnessed to save energy by incorporating PCMs in the materials used. In this study, passive integration of PCM in cement was tested and thermal properties of such an integration was assessed. The results provide insights into how PCMs affect cement as part of the concrete mixture, thus identifying the contribution of PCM-based cements in concrete mixtures.

show abstract

Influence of fine aggregates on the microstructure, porosity and chemico-mechanical stability of inorganic polymer concretes

Cited by 22 publications

References 23 publications

Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials

Meta-halloysite to improve compactness in iron-rich laterite-based alkali activated materials

Design of Inorganic Polymer Mortar from Ferricalsialic and Calsialic Slags for Indoor Humidity Control

The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement

Contact Info

Product

Resources

About