Development of sustainable concrete using silica fume and stone dust

This research evaluates the behavior corrosion of galvanized steel (GS) and AISI 1018 carbon steel (CS) embedded in conventional concrete (CC) made with 100% CPC 30R and two binary sustainable concretes (BSC1 and BSC2) made with sugar cane bagasse ash (SCBA) and silica fume (SF), respectively, after 300 days of exposure to 3.5 wt.% MgSO4 solution as aggressive medium. Electrochemical techniques were applied to monitor corrosion potential (Ecorr) according to ASTM C-876-15 and linear polarization resistance (LPR) according to ASTM G59 for determining corrosion current density (icorr). Ecorr and icorr results indicate after more than 300 days of exposure to the sulfate environment (3.5 wt.% MgSO4 solution), that the CS specimens embedded in BSC1 and BSC2 presented greater protection against corrosion in 3.5 wt.% MgSO4 than the specimens embedded in CC. It was also shown that this protection against sulfates is significantly increased when using GS reinforcements. The results indicate a higher resistance to corrosion by exposure to 3.5 wt.% magnesium sulfate two times greater for BSC1 and BSC2 specimens reinforced with GS than the specimens embedding CS. In summary, the combination of binary sustainable concrete with galvanized steel improves durability and lifetime in service, in addition to reducing the environmental impact of the civil engineering structures.

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Determination of the optimal replacement content of Portland cement by stone powder using particle packing methods and analysis of the influence of the excess water on the consistency of pastes

Revista IBRACON de Estruturas e Materiais ◽

10.1590/s1983-41952019000200002 ◽

2019 ◽

Vol 12 (2) ◽

pp. 210-232 ◽

Cited By ~ 4

Author(s):

H. F. CAMPOS ◽

T. M. S. ROCHA ◽

G. C. REUS ◽

N. S. KLEIN ◽

J. MARQUES FILHO

Keyword(s):

Portland Cement ◽

Silica Fume ◽

Packing Density ◽

Particle Packing ◽

Attractive Alternative ◽

Excess Water ◽

Stone Dust ◽

Powder Content ◽

Substitution Content

Abstract Cement is considered the basic component with the highest environmental impact in construction, in terms of CO2 emissions. As for the aggregates, the process of comminution of rocks, in addition to artificial sand, generates stone powder that ends up being stored outdoors, generating environmental damages. Thus, the replacement of cement by stone powder appears as an attractive alternative towards the sustainable concretes. In this context, the objective of this paper is to determine the maximum packing density in Portland cement, silica fume and stone dust pastes, to determine the optimal cement substitution content for the stone powder. In addition, it is intended to verify the influence of excess water on the consistency of the mixtures produced. The substitution was done in contents equal to 0%, 7%, 14% and 21% by volume and, for each content, the packing density was determined analytically by CPM model and combinations were reproduced experimentally. Excess water was checked by the mini Kantro cone test. The results showed that the higher cement substitution content of the stone powder obtained the higher packing density, experimental and analytical, and the higher workability, allowing economic and environmental advantages. Analyzing each material, the stone powder resulted in the highest packing density and silica fume is the lowest one. Therefore, finer particles resulted in lower packaging densities, due to the greater specific surface area, which demands more water. The agglomeration resulted in more empty gaps between the grains. In addition, mixtures flowability increased with the increase of the stone powder content. As the excess water is responsible for mixture lubrication, a higher packing density for a given volume of water improves the flowability.

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A step towards sustainable glass fiber reinforced concrete utilizing silica fume and waste coconut shell aggregate

Scientific Reports ◽

10.1038/s41598-021-92228-6 ◽

2021 ◽

Vol 11 (1) ◽

Author(s):

Osama Zaid ◽

Jawad Ahmad ◽

Muhammad Shahid Siddique ◽

Fahid Aslam ◽

Hisham Alabduljabbar ◽

...

Keyword(s):

Glass Fiber ◽

Silica Fume ◽

Glass Fibers ◽

Fiber Reinforced Concrete ◽

Coconut Shell ◽

Waste Materials ◽

Partial Replacement ◽

Sustainable Concrete ◽

Concrete Production ◽

The Impact

AbstractToday, it’s getting harder to find natural resources for concrete production. Utilization of the waste materials not just helps in getting them used in concrete, cement, and other construction materials, but also has various secondary advantages, for example, saving in energy, decrease in landfill cost, and protecting climate from pollution. Considering this in the development of modern structural design, utilizing waste materials instead of natural aggregate is a good option to make concrete that is sustainable and eco-friendly. The present research aims to find the impact of adding glass fiber into sustainable concrete made with silica fume, as a partial replacement of cement, and coconut shell added with different ratios as a replacement of coarse aggregate, on concrete mechanical and durability aspects. Various blends were made, with coconut shell as a substitution of coarse aggregates with different ratios. Portland cement was substituted with silica fume at 5%, 10%, 15%, and 20% by cement weight in all concrete blends. The volume ratios of glass fibers utilized in this study were 0.5%, 1.0%, 1.5% and 2.0%. Adding glass fibers increases concrete density to some extent and then marginally reduces the density of coconut shell concrete. When the percentage of glass fibers increases, the compressive, flexural and split tensile strength of coconut shell concrete also increases. From the lab results and SEM images of the present research display that glass fibers might be utilized in coconut shell concrete to enhance its mechanical and durability attributes, to accomplish sustainable concrete with acceptable strength with ease.

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Developing a sustainable concrete incorporating bentonite clay and silica fume: Mechanical and durability performance

Journal of Cleaner Production ◽

10.1016/j.jclepro.2021.130315 ◽

2022 ◽

pp. 130315

Author(s):

Muhammad Ashraf ◽

Muhammad Farjad Iqbal ◽

Momina Rauf ◽

Muhammad Usman Ashraf ◽

Aman Ulhaq ◽

...

Keyword(s):

Silica Fume ◽

Bentonite Clay ◽

Sustainable Concrete ◽

Durability Performance

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PERFORMANCE OF SUSTAINABLE GREEN CONCRETE INCORPORATED WITH FLY ASH, RICE HUSK ASH, AND STONE DUST

Acta Polytechnica ◽

10.14311/ap.2021.61.0279 ◽

2021 ◽

Vol 61 (1) ◽

pp. 279-291

Author(s):

Ayesha Siddika ◽

Md. Ruhul Amin ◽

Md. Abu Rayhan ◽

Md. Saidul Islam ◽

Md. Abdullah Al Mamun ◽

...

Keyword(s):

Fly Ash ◽

Rice Husk ◽

Rice Husk Ash ◽

High Surface ◽

Absorption Capacity ◽

Partial Replacement ◽

Shear Cracks ◽

Green Concrete ◽

Sustainable Concrete ◽

Stone Dust

The performance of a sustainable green concrete with fly ash (FA), rice husk ash (RHA), and stone dust (SD) as a partial replacement of cement and sand was experimentally explored. FA and RHA have a high silica content, are highly pozzolanic in nature and have a high surface area without any treatment. These by-products show filler effects, which enhance concrete’s density. Results showed that the FA and RHA materials have good hydration behaviour and effectively develop strength at an early age of concrete. SD acts as a stress transferring medium within concrete, thereby allowing the concrete to be stronger in compression, and bending. Consequently, water absorption capacity of the sustainable concrete was lower than that of the ordinary one. However, a little reduction in strength was observed after the replacement of the binder and aggregate using the FA, RHA and SD, but the reduction was insignificant. The reinforced structure with sustainable concrete containing the FA, RHA, and SD generally fails in concrete crushing tests initiated by flexural cracking followed by shear cracks. The sustainable concrete could be categorized as a perfect material with no significant conciliation in strength properties and can be applied to design under-reinforced elements for a low-to-moderate service load.

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Optimization of Sustainable Concrete Mixes Containing Binary and Ternary Blends

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.853.131 ◽

2020 ◽

Vol 853 ◽

pp. 131-141

Author(s):

Reem Sabouni ◽

Hassan Raad Abdulhameed

Keyword(s):

Silica Fume ◽

Optimization Process ◽

Partial Replacement ◽

Cost Ratio ◽

Concrete Durability ◽

Sustainable Concrete ◽

Benefit Cost Ratio ◽

Class F Fly Ash ◽

Benefit Cost ◽

Class F

In this research 26 mixes in six different group were studied with three groups for each of the water cementitious material ratios (w/b) of 0.3 and 0.4 and a control mix. The first and fourth groups contained five percentages of silica fume (SF) as partial replacement of cement (5%, 7.5%, 10%, 12.5, 15%) for w/b ratios of 0.3 and 0.4, respectively. The second and fifth groups contained four percentages of Class F fly (FA) ash as partial replacement of cement (10%, 15%, 20% and 25%) for the w/b ratios of 0.3 and 0.4, respectively. The third and sixth groups contained three different percentages of both Class F fly ash and silica fume as partial replacement of cement with SF 5%+ FA 10%, SF 10%+ FA 15% and SF 15%+ FA 20% for w/b ratios of 0.3 and 0.4, respectively. For all of these mixes the compressive strength was first studied then the benefit greenhouse gases (GHG) ratio and Benefit cost ratio were found for all the studied mixes. Two optimization processes were performed during the course of this research, the first optimization process results can be used when the concrete durability is not a concern (concrete durability results are not accounted for). Whereas, the results of the second optimization process can be used when the concrete durability is a concern (concrete durability results are accounted for). The details of the results and the optimization processes are presented in this paper.

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