The Role of Polyethylene Glycol, a Water Entrainer on Characteristics of Silico Alumino Phosphate Geopolymer to Harvest Enhanced Gel Phase and Stability

Vanitha, N.; Jeyalakshmi, R.

doi:10.1007/s10904-023-02715-8

Cited by 2 publications

(4 citation statements)

References 40 publications

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“…A noteworthy increase in compressive strength is observed for thermally cured geopolymers, notably in the early stages. Thermal curing at 80 • C increased the compressive strength from 14 to 40 MPa at 14 days and from 20 to 46 MPa at 28 days [50]. Following the same trend, curing at 60 • C increased compressive strength from 21 to 30 MPa at 14 days [8].…”

Section: Compressive Strengthmentioning

confidence: 56%

“…Figure 6 compiles the optimal compressive strength results from studie MK as a single precursor, distinguishing between curing at RT and therma noteworthy increase in compressive strength is observed for thermally cure mers, notably in the early stages. Thermal curing at 80 °C increased the c strength from 14 to 40 MPa at 14 days and from 20 to 46 MPa at 28 days [50] the same trend, curing at 60 °C increased compressive strength from 21 to 3 days [8]. Rising temperature produces a geopolymer structure richer in alum phate phases that increase the material's compressive strength [8].…”

Section: Compressive Strengthmentioning

confidence: 71%

“…It is possible to see that the rate of increase in compressive strength is higher at early ages and decreases with increasing curing time [40,45,50,51]. The timeframe for gaining strength in these materials remains unknown, and it is common to evaluate the standard period of 28 days used for OCP, although the material apparently continues to gain significant strength beyond this period [45].…”

Section: Compressive Strengthmentioning

confidence: 99%

“…Adding an optimal dose of 2% rGO does not affect the product's existing gel network but densifies the microstructure and brings resistance gains of between 10 and 12% at all curing ages [40]. Intending to minimize the harmful effects of thermal curing and develop a shrinkage-free geopolymer, the addition of PEG prevented thermocracking and formed more amorphous aluminum silica phosphates with fewer micropores [50]. Replacement of up to 6% by weight with highly soluble Ca(OH) 2 improved compressive strength at any age, while poorly soluble CaSiO 3 decreased compressive strength for any percentage of replacement [51].…”

Section: Additivesmentioning

confidence: 99%

See 3 more Smart Citations

Acid Activation in Low-Carbon Binders: A Systematic Literature Review

Park,

Pimenta,

Bezerra

2023

Buildings

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Geopolymers have emerged as an alternative binding material to Ordinary Portland Cement (OPC). Recently, there has been an increase in studies exploring the synthesis of these materials using acid activation rather than traditional alkaline activation. This approach offers benefits such as good strength at an early age, better thermal properties, and a chemical activator that emits less carbon to be produced. In addition, it provides resistance to efflorescence and leaching, which are common challenges associated with alkali-activated products. This work analyzed the scientific advances in acid activation in synthesizing an alternative binder to OPC. To this end, a systematic review of the last five years of scientific literature was carried out using the Systematic Review for Engineering and Experiments (SREE) method. The results show a notable increase in research focused on acid activation over the last few years. The acid activators were always phosphate solutions, mainly phosphoric acid. Metakaolin was the most tested precursor, followed by fly ash, and volcanic ash. The research requires improvements in the methodological quality, providing data on molar ratios (Al/P, Si/Al, and Si/P), Liquid/Solid mass ratio, activator solution molarity, and curing process, in addition to statistical treatment and comparison of results. There exists a paucity of diversity in the examined precursors, activators, and additives. Future research developments need to clarify the behavior of mechanical resistance over time, better curing process, water resistance, durability, and the role of iron, magnesium, and calcium silicates and/or oxides. The paper identifies the main research gaps in the area and functions as a database, guiding researchers in selecting raw materials, dosing methodology, and curing processes.

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Section: Compressive Strengthmentioning

confidence: 56%