RETRACTED: Monitoring of chloride and Friedel’s salt, hydration components, and porosity in high-performance concrete

Bachtiar, Erniati; Rachim, Fatmawaty; Makbul, Ritnawati; Tata, Arbain; Hassan, Muhammad; Kırgız, Mehmet Serkan; Syarif, Muhammad; Galdino, André Gustavo de Sousa; Khitab, Anwar; Benjeddou, Omrane; Kolovos, Konstantinos G.; Ledesma, Enrique; Yusri, Andi

doi:10.1016/j.cscm.2022.e01208

Cited by 9 publications

(6 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Thus, Figure 6 shows images with hexagonal plates of portlandite (b), where the C-S-H “honeycomb” structure can also be seen, along with column aggregates of portlandite (d) and short fibres of ettringite (f). Examination of this bundle of fibres, shown in Figure 6 h, at a higher magnification reveals crystals with a similar shape to those observed by other authors, attributed to Friedel’s salt [ 74 , 78 , 79 ]. In the microstructure of SCB1, although no hexagonal plates of portlandite were observed, some microstructures, which could be aggregates of portlandite (lower left corner of images ( Figure 6 a,c)), are visible.…”

Section: Resultssupporting

confidence: 82%

Municipal Solid Waste Incineration Fly Ash: From Waste to Cement Manufacturing Resource

et al. 2023

View full text Add to dashboard Cite

This study investigates the possibility of using municipal solid waste incineration fly ash as a supplementary cementitious material to replace part of the clinker in cement. Life cycle assessment has shown that the partial replacement of clinker with blast furnace slag (CEM III) reduces cement’s global warming potential by ~30%, while replacing clinker with fly ash reduces it by up to 55%. When using CEM III as the control binder in cement in which 55 wt% of the clinker was replaced with hydrothermally treated fly ash, the flexural strength decreased by ~60% and the compressive strength by ~65%. When the fly ash was mixed with calcined and vitrified demolition materials, flexural strength decreased by ~30% and compressive strength by ~50%. The hardening of the hydraulic binders fixed the heavy metals in the municipal solid waste incineration fly ash.

show abstract

Section: Resultssupporting

confidence: 82%

Municipal Solid Waste Incineration Fly Ash: From Waste to Cement Manufacturing Resource

et al. 2023

View full text Add to dashboard Cite

show abstract

“…The results indicated that a 10% substitution using rice husk ash was optimal. Bachtiar et al [ 22 ] selected seawater as the mixing water for HPC and discovered that adding seawater and curing concrete in a seawater environment produced concrete with comparatively lower porosity. Mokhtar et al [ 23 ] used nanoscale clay, silicon dioxide, and mixed aggregates to evaluate the performance of HPC after being cured for 28 days.…”

Section: Introductionmentioning

confidence: 99%

Engineering Properties of Green and Ecofriendly Grouting Materials with Different Sand Filling Ratios

Juang

Kuo

2023

Materials

View full text Add to dashboard Cite

With the active development of offshore wind power worldwide, the development of a green and ecofriendly grouting material (GEGM) has garnered global attention. Such a material must also be developed in Taiwan. Therefore, in this study, a series of environmentally friendly recycled materials were mixed in different proportions to develop a GEGM which can be implemented in the future construction of offshore wind turbines. To evaluate the mechanical properties of the GEGM, low water-to-binder (W/B) ratios (i.e., 0.21, 0.27, and 0.35) were used; cement was replaced with fixed amounts (20%) of ground granulated blast-furnace slag and fly ash; 2%, 2.5%, and 3% superplasticizers (SPs) were added; and two levels of sand content (60% and 70%) were used. The setting time of the GEGM was used to evaluate its workability; its compressive strength and flexural strength were used to evaluate its mechanical properties; and its sulfate resistance, length changes, and four-terminal resistance were used to evaluate its durability. The relationship between the durability and drying shrinkage of the GEGM was subsequently evaluated, and the ratio of final to initial setting times (F/I value) was calculated to determine the effects of the amount of SP added on workability. The highest F/I value (7.7) was achieved when 2 wt.% modified lignin sulfonate (MLS) was added because of the high viscosity of MLS, which compromised the workability of the concrete. The optimal compressive strength (83.62 MPa) was achieved when a W/B ratio of 0.21 was used, when the sand content was 70%, and when a 2% polycarboxylate superplasticizer (PCE) was added, whereas the optimal flexural strength (20.86 MPa) was achieved when 2.5% PCE was added. According to the nondestructive test results and the R2 value (>0.7) obtained from regression analyses of mechanical properties, the study results are reliable and may serve as a reference for future construction projects.

show abstract

“…Lin et al [17] examined the combined effects of expansive agents and glass fibres on the fracture performance of seawater and sea-sand concrete and found that the optimal expansive agent content was 3%-6%, which increased with increasing glass fibre content. Bachtiar et al [18] studied the effect of seawater as a curing/mixing constituent on highperformance concrete and observed that seawater-treated concrete contained increased hydration components (tobermorite and ettringite).…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of behaviour of concrete mixed and cured with Nembe seawater

Eziefula¹,

Egbufor²,

Udoha³

2023

Res. Eng. Struct. Mater.

View full text Add to dashboard Cite

Freshwater is conventionally used to produce concrete, but freshwater scarcity has become a significant challenge worldwide. The aim of this study is to experimentally investigate the workability and strength of Portland cement concrete mixed and cured with Nembe seawater. The initial and final setting times and slump of fresh concrete mixed with freshwater and seawater were determined. Four sets of concrete specimens were produced for the compressive strength tests: concrete cast and cured with freshwater, cast with freshwater and cured with seawater, cast with seawater and cured with freshwater, and cast and cured with seawater. The use of seawater for mixing concrete decreased the initial setting time of the cement paste and the slump of concrete by approximately 36% and 54%, respectively. Concrete specimens mixed with seawater and cured with freshwater exhibited the highest compressive strengths at the 60 th and 90 th days of curing. Although the concrete mixed with seawater yielded slightly higher compressive strengths than concrete mixed with freshwater, the difference between using freshwater and seawater as mixing and curing water in terms of compressive strength was minimal.

show abstract

RETRACTED: Monitoring of chloride and Friedel’s salt, hydration components, and porosity in high-performance concrete

Cited by 9 publications

References 45 publications

Municipal Solid Waste Incineration Fly Ash: From Waste to Cement Manufacturing Resource

Municipal Solid Waste Incineration Fly Ash: From Waste to Cement Manufacturing Resource

Engineering Properties of Green and Ecofriendly Grouting Materials with Different Sand Filling Ratios

Experimental investigation of behaviour of concrete mixed and cured with Nembe seawater

Contact Info

Product

Resources

About