A new approach for application of silica fume in concrete: Wet granulation

Karein, S. Mahmoud Motahari; Ramezanianpour, Ali Akbar; Ebadi, Taghi; Isapour, Soroush; Karakouzian, Moses

doi:10.1016/j.conbuildmat.2017.09.132

Cited by 57 publications

(17 citation statements)

References 21 publications

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“…Electrical resistivity is directly dependent on CEBs permeability. In water-saturated CEBs with higher porosity, the propagation of ions is easier, and therefore, there is a lower electrical resistivity [47]. From Figure 8, it is possible to conclude that the measurements done in the direction of the bigger dimension (length) of the sample showed similar results for all samples.…”

Section: Electrical Resistivitymentioning

confidence: 68%

Mechanical and Thermal Performance Characterisation of Compressed Earth Blocks

et al. 2020

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The present research is focused on an experimental investigation to evaluate the mechanical, durability, and thermal performance of compressed earth blocks (CEBs) produced in Portugal. CEBs were analysed in terms of electrical resistivity, ultrasonic pulse velocity, compressive strength, total water absorption, water absorption by capillarity, accelerated erosion test, and thermal transmittance evaluated in a guarded hotbox setup apparatus. Overall, the results showed that compressed earth blocks presented good mechanical and durability properties. Still, they had some issues in terms of porosity due to the particle size distribution of soil used for their production. The compressive strength value obtained was 9 MPa, which is considerably higher than the minimum requirements for compressed earth blocks. Moreover, they presented a heat transfer coefficient of 2.66 W/(m2·K). This heat transfer coefficient means that this type of masonry unit cannot be used in the building envelope without an additional thermal insulation layer but shows that they are suitable to be used in partition walls. Although CEBs have promising characteristics when compared to conventional bricks, results also showed that their proprieties could even be improved if optimisation of the soil mixture is implemented.

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Section: Electrical Resistivitymentioning

confidence: 68%

Mechanical and Thermal Performance Characterisation of Compressed Earth Blocks

et al. 2020

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“…The materials used in the preparation of the concrete are presented in Table 1. The cement has a specific gravity (helium gas pycnometry -AccuPyc II 1340 Micromeritics) equal to 3.14 g/cm 3 , specific surface area BET (Gemini 2370 V1.02 -Micrometrics) equal to 7480 cm 2 /g and median equivalent diameter, D 50 (Mastersizer 2000 Malvern), equal to 0.038 mm.…”

Section: Methodsmentioning

confidence: 99%

“…The addition of supplementary materials with pozzolanic characteristics has been proving to be a good alternative for improve the concrete properties while also reducing cement consumption. The addition of silica fume (a byproduct with a high SiO 2 content) to concrete allows the formation of secondary calcium silicate hydrates (C-S-H), which promote the pore sealing and discontinuity, making the passage of chloride ions more difficult and increasing their adsorption on the surface of the formed C-S-H [1]- [3].…”

Section: Introductionmentioning

confidence: 99%

Correlation between diffusion coefficient values of chloride ions obtained through column and ion migration tests in cementitious matrices with varying contents of silica fume and mortar

Pinto

Machado

Ribeiro

2022

Rev. IBRACON Estrut. Mater.

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Corrosion is one of the main phenomena that lead to pathological manifestations in reinforced concrete structures under aggressive environments. with the chloride ion being the most responsible for its occurrence. In this way, understanding the transport mechanisms of this ion through the microstructure of the concrete is of fundamental importance to prevent or delay the penetration of these aggressive agents to guarantee a durable structure. In the literature, there are extensive studies concerning the diffusion of chlorides in concrete and the influence of pozzolanic additions in this mechanism. However, only a few correlate the different methods of analysis. This work aims to determine the chloride ion diffusion coefficients in concrete containing various levels of silica fume (5%, 10%, and 15%) or varying the mortar content (54%, 80%, and 100%), and compares the results obtained through column tests and chloride migration tests. It was observed that, although the techniques used were quite distinct, the diffusion values obtained were similar, contributing to the validation of both techniques. Furthermore, the variation in the mortar ratio causes a reduction in the interfacial transition zone of coarse aggregate/mortars and an increase in the content of aluminates, which promotes a similar effect to the use of silica fume.

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“…In the study [37], the density of silica fume was increased by producing silica fume granules mixed with a solid super plasticizer. Results indicated an increase in strength and surface electrical resistivity, and a decrease in permeability for both slurry silica fume and granule, compared to the control sample.…”

Section: Highly Reactive Pozzolansmentioning

confidence: 99%

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

Strzałkowski

Garbalińska

2020

Materials

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The paper examines the impact of aggregate shape on the compressive strength and thermal properties of concretes with silica fume based on two different aggregates: natural round gravel aggregate and crushed basalt aggregate. Compressive strength and thermal properties of individual concretes were determined during the first year of specimens curing. Additionally, porosity tests were conducted using mercury intrusion porosimetry and optical porosimetry. Mercury porosimetry tests showed that the use of silica fume led to a decrease in the content of pores of size smaller than 0.15 µm compared to the reference concretes without the addition of silica fume. However, tests carried out on crushed basalt-based concrete showed the presence of numerous additional pores with diameters ranging from 0.05 to 300 μm. In case of natural round gravel aggregate-based concrete, the addition of silica fume brought about an increase in its compressive strength. In turn, basalt-based concrete exhibited notably lower compressive strength values due to significantly higher porosity within the range of more than 70 μm. In basalt concrete, the obtained λ values are much lower than in concretes with normal gravel aggregate. In addition, the specific porosity structure had its impact on the process of drying of specimens of each group which occurred at a significantly faster rate in the basalt-based concrete. In conclusion, it can be stated that the use of crushed basalt aggregate causes a significant aeration of concrete, even despite the use of silica fume. As a result, the concrete based on crushed aggregate is characterized by a definitely lower compressive strength, but also better thermal insulation properties compared to analogous concrete made on natural round gravel aggregate.

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A new approach for application of silica fume in concrete: Wet granulation

Cited by 57 publications

References 21 publications

Mechanical and Thermal Performance Characterisation of Compressed Earth Blocks

Mechanical and Thermal Performance Characterisation of Compressed Earth Blocks

Correlation between diffusion coefficient values of chloride ions obtained through column and ion migration tests in cementitious matrices with varying contents of silica fume and mortar

The Effect of Aggregate Shape on the Properties of Concretes with Silica Fume

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