Effect of activator nature on the impact behaviour of Alkali-Activated slag mortar

Soliman, Ahmed M.; Diab, S.H.

doi:10.1016/j.conbuildmat.2020.119531

Cited by 38 publications

(20 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The compressive strengths of the 3 days and 14 days cured samples with the activator of a Na 2 O content of 8%, increased by 16.4% and 40%, respectively, compared with that of the sample added the activator with a Na 2 O content of 6%. On the other hand, from Figure 7, the increase in activator modulus from 1.0 to 1.5 leads to the reduction in the compressive strength of alkali-activated slag mortar, which is consistent with the results in the previous studies [34,35]. Using the activator with high modulus increases the silicate content in the system which induces the higher surface tension of the solution, thus hindering the dissolution of precursor particles [34,36].…”

Section: Compressive Strength Development Of Alkali-activated Slag Mortarssupporting

confidence: 89%

“…On the other hand, from Figure 7, the increase in activator modulus from 1.0 to 1.5 leads to the reduction in the compressive strength of alkali-activated slag mortar, which is consistent with the results in the previous studies [34,35]. Using the activator with high modulus increases the silicate content in the system which induces the higher surface tension of the solution, thus hindering the dissolution of precursor particles [34,36].…”

Section: Compressive Strength Development Of Alkali-activated Slag Mortarssupporting

confidence: 89%

See 1 more Smart Citation

Understanding the Role of Metakaolin towards Mitigating the Shrinkage Behavior of Alkali-Activated Slag

Cheng

Han

et al. 2021

Materials

View full text Add to dashboard Cite

This research investigates the mechanism of metakaolin for mitigating the autogenous and drying shrinkages of alkali-activated slag with regard to the activator parameters, including concentration and modulus. The results indicate that the incorporation of metakaolin can decrease the initial viscosity and setting time. Increasing activator concentration can promote the reaction process and shorten the setting time. An increase in the metakaolin content induces a decrease in compressive strength due to reduced formation of reaction products. However, increasing activator dosage and modulus can improve the compressive strength of alkali-activated slag containing 30% metakaolin. The inclusion of metakaolin can mitigate the autogenous and drying shrinkage of alkali-activated slag by coarsening the pore structure. On the other hand, increases in activator concentration and modulus result in an increase in magnitude of the autogenous and drying shrinkage of alkali-activated slag containing metakaolin. The influence of the activator modulus on the shrinkage behavior of alkali-activated slag-metakaolin binary system should be further investigated.

show abstract

Section: Compressive Strength Development Of Alkali-activated Slag Mortarssupporting

confidence: 89%

Section: Compressive Strength Development Of Alkali-activated Slag Mortarssupporting

confidence: 89%

Understanding the Role of Metakaolin towards Mitigating the Shrinkage Behavior of Alkali-Activated Slag

Cheng

Han

et al. 2021

Materials

View full text Add to dashboard Cite

show abstract

“…In order to solve the problem of large shrinkage of slag system, Puertas et al [ 29 ] studied the effect of polypropylene fibers on the properties of alkali activated composites and found that adding 1% polypropylene fiber can reduce the shrinkage. Kai et al [ 30 ] used MgO, CaO and MgO-CaO mixtures to excite slag, and the results showed that MgO and CaO mixtures can effectively inhibit the shrinkage of harden specimens, but the strength is lower than that of composite with potassium silicate and NaOH [ 31 ]. Zheng et al [ 32 ] used MgO and sodium silicate to excite the slag, and the results showed that the composite excitation could form richer hydration products possessing higher mechanical strength.…”

Section: Introductionmentioning

confidence: 99%

The Influence of CaO and MgO on the Mechanical Properties of Alkali-Activated Blast Furnace Slag Powder

et al. 2022

View full text Add to dashboard Cite

CaO and MgO are both reported as effective activators for blast furnace slag. However, the synergistic effect of these two components on the mechanical properties of alkali-activated blast furnace slag remains unclear. In this study, the flexural and compressive strengths of alkali-activated blast furnace slag powder with MgO and CaO range from 0% to 30% by the mass ratio of alkali-activated blast furnace slag powder are investigated. Moreover, the dry shrinkage rate of alkali-activated blast furnace slag powder is measured. One percent refractory fibers by volume of binder materials are added in the alkali-activated blast furnace slag. Some refractory fibers are treated with water flushing, meanwhile, some refractory fibers are directly used without any treatment. Finally, the scanning electron microscope, the thermogravimetric analysis curves and the XRD diffraction spectrums are obtained to reflect the inner mechanism of the alkali-activated blast furnace slag powder’s mechanical properties. The water-binder ratios of the alkali-activated blast furnace slag powder are 0.35 and 0.42. The curing ages are 3 d, 7 d and 28 d. The measuring temperature for the specimens ranges from 20 °C to 800 °C. Results show that the flexural and compressive strengths increase with the increased curing age, the decreased water-binder ratio and the addition of refractory fibers. The water-treated refractory fibers can improve the mechanical strengths. The mechanical strengths increase in the form of a quadratic function with the mass ratio of MgO and CaO, when the curing age is 3 d, the increasing effect is the most obvious. A higher water-binder ratio leads to an increasing the drying shrinkage rate. The activated blast furnace slag powder with CaO shows a higher drying shrinkage rate. The mechanical strengths decrease with the increasing testing temperature.

show abstract

“…In the concentrated alkaline solution, precursors are dissolved rapidly and release alumina [AlO 4 ] − and silica [SiO 4 ]- tetrahedral units. These units are alternatively connected forming a polymeric bond that develops its binding features based on the reaction shown in Equation (1) [ 22 ]. (Si 2 O 5 Al 2 O 2 ) n + H 2 O + OH → Si(OH) 4 + Al(OH) 4− …”

Section: Introductionmentioning

confidence: 99%

Performance of Fly Ash-Based Inorganic Polymer Mortar with Petroleum Sludge Ash

et al. 2021

View full text Add to dashboard Cite

Petroleum sludge is a waste product resulting from petroleum industries and it is a major source of environmental pollution. Therefore, developing strategies aimed at reducing its environmental impact and enhance cleaner production are crucial for environmental mortar. Response surface methodology (RSM) was used in designing the experimental work. The variables considered were the amount of petroleum sludge ash (PSA) in weight percent and the ratio of sodium silicate to sodium hydroxide, while the concentration of sodium hydroxide was kept constant in the production of geopolymer mortar cured at a temperature of 60 °C for 20 h. The effects of PSA on density, compressive strength, flexural strength, water absorption, drying shrinkage, morphology, and pore size distribution were investigated. The addition of PSA in the mortar enhanced the mechanical properties significantly at an early age and 28 days of curing. Thus, PSA could be used as a precursor material in the production of geopolymer mortar for green construction sustainability. This study aimed to investigate the influence of PSA in geopolymer mortar.

show abstract

Effect of activator nature on the impact behaviour of Alkali-Activated slag mortar

Cited by 38 publications

References 37 publications

Understanding the Role of Metakaolin towards Mitigating the Shrinkage Behavior of Alkali-Activated Slag

Understanding the Role of Metakaolin towards Mitigating the Shrinkage Behavior of Alkali-Activated Slag

The Influence of CaO and MgO on the Mechanical Properties of Alkali-Activated Blast Furnace Slag Powder

Performance of Fly Ash-Based Inorganic Polymer Mortar with Petroleum Sludge Ash

Contact Info

Product

Resources

About