Effect of Curing Conditions on the Strength Development of Alkali-Activated Mortar

Kong, Lijuan; Fan, Zirui; Ma, Wenchen; Lu, Jiatao; Liu, Yazhou

doi:10.3390/cryst11121455

Cited by 7 publications

(3 citation statements)

References 26 publications

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“…The silica content (SiO2) and the alumina content (Al2O3) represents approximately 80 -95% of the fly ash content [29], and plays a major role in produced GPC mix properties [30][31][32]. Similarly, the type of alkaline activator , and curing conditions [36,37] would affect the strength and durability of hardened geopolymers.…”

Section: Fly Ash Pozzolanic Activitymentioning

confidence: 99%

Role of Fly Ash in Concrete Construction Industry

Akhnoukh¹

2023

Preprint

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This paper discusses the use of fly ash in concrete construction industry. Fly ash is incorporated as a supplementary cementitious material (SCM) in ordinary Portland cement (OPC) concrete in partial replacement of cement, and is recently used as a geopolymer cement in the development of geopolymer concrete (GPC) mixes. Class C and Class F fly ash high aluminosilicate content, and fine granular size contributes to concrete improved workability, lower permeability, and reduced heat of cement hydration. Due to its chemical properties, the use of fly ash in producing OPC and GPC results in increased compressive strength, higher tensile strength evaluated by measuring hardened concrete modulus of rupture (MOR), and higher modulus of elasticity (MOE). The fine size of fly ash particles increases the concrete mix packing order, and reduce the ingress of moisture, and mitigates the impact of aggressive environmental attacks through the reduction of sulfates and chlorides rate of concrete penetration. Thus, fly ash improves concrete resistivity to alkali-aggregate reactions (AAR), and reduces the corrosion of reinforcing steel, and prestressing strands. Fly ash as an economic byproduct of coal industry results in reduced material cost, increased durability, and a higher sustainability of concrete construction projects.

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Section: Fly Ash Pozzolanic Activitymentioning

confidence: 99%

Role of Fly Ash in Concrete Construction Industry

Akhnoukh¹

2023

Preprint

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“…The largest application may be for airport runway materials in Australia [ 11 ]. Alkali-activated materials produced by steam curing and autoclaved curing, which are generally applied to conventional precast concrete products, were also studied; it was reported that rapid strength development is possible by these high-temperature curing methods [ 12 , 13 ].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on the Application of Cementless Material with Industrial By-Products to Steam-Cured Precast Concrete Products

Hata¹,

Sato²,

Miyazawa

2022

Materials

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The purpose of this study was to apply a cementless binder using industrial by-products (fly ash, ground-granulated blast furnace slag, and silica fume) to precast concrete products. In this binder, calcium hydroxide was included as an alkali stimulant but Portland cement was not included. Experiments on the compressive strength and durability of this type of material were conducted and its applicability to precast concrete products was investigated using full-scale specimens. The experiments proved that high-temperature steam curing is effective at obtaining strength development and that compressive strength can be expressed as a linear function of the binder–water ratio. Experimental results of chloride ion diffusion coefficient and sulfuric acid resistance suggested that the proposed material has higher resistances than conventional cement concrete against these deterioration factors. It was also demonstrated that full-scale specimens of a box culvert and a centrifugally compacted pipe using this type of material have almost the same load-bearing capacity and deformation performance as those using conventional cement concrete. It is believed that the proposed material could be used as a construction material instead of cement concrete, contribute to reducing CO2 emission, and increase the reuse of industrial by-products.

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“…RCP from waste cement mortars is mainly composed of silicon and aluminum compounds, such as SiO 2 and Al 2 O 3 , which have potential alkali activity. Hence, granulated blast furnace slag (GBFS), fly ash (FA) and AARCPC can be synthesized to geopolymers [17][18][19][20][21][22] by regulating the compounds, fineness and activation technology. However, RCP has low pozzolanic activity and is composed of irregular particles, which limits its use in cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Mineral Admixtures on Mechanical Properties of Alkali-Activated Recycled Concrete Powders Cement

et al. 2022

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Recycled concrete powders (RCPs) are collected during the treatment of recycled aggregates using devices that suction dust. However, RCPs have not been effectively utilized as mineral admixtures in concrete due to their low activity and high capacity for water absorption. In this study, alkali-activated recycled concrete powders cement (AARCPC) was prepared using chemical activation, and then the composition, fluidity, setting time, strength and micro-structure of hydration products in AARCPC were studied. We found that the addition of mineral admixtures significantly improved the strength of hardened paste at various ages, and that the effect of slag powders on the mechanical properties was significantly better than that of fly ash. Replacing AARCPC with 50% slag caused the 28 d and 90 d compressive strength of pastes to reach 79.5 and 84.4 MPa, respectively. The optimal ratio of the various minerals that make up AARCPC was 60% recycled concrete powder, 20% slag powder and 20% fly ash. In particular, hydration with fly ash and slag of AARCPC promotes better fluidity and compactness. AARCPC showed higher strength and has the potential to replace Portland cement and be applied to concrete.

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Effect of Curing Conditions on the Strength Development of Alkali-Activated Mortar

Cited by 7 publications

References 26 publications

Role of Fly Ash in Concrete Construction Industry

Role of Fly Ash in Concrete Construction Industry

Experimental Study on the Application of Cementless Material with Industrial By-Products to Steam-Cured Precast Concrete Products

Investigation of Mineral Admixtures on Mechanical Properties of Alkali-Activated Recycled Concrete Powders Cement

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