Monitoring Apparent pH Value in Geopolymer Concrete Using Glass Electrode

Jin, Dongping; Shen, Xuesong; Castel, Arnaud; Aldred, James

doi:10.22260/isarc2016/0066

Cited by 7 publications

(3 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Geopolymers use industrial by-products as precursors, and, therefore, result in the emission of significantly less CO 2 per ton of concrete produced [21]. Geopolymer concrete (GPC) is estimated to reduce 80% carbon footprint in construction projects compared with ordinary Portland cement [22,23].…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Compressive Strength of Geopolymers: A Review

et al. 2021

View full text Add to dashboard Cite

Geopolymers are created by mixing a source of aluminosilicates, which can be natural or by-products from other industries, with an alkaline solution. These materials based on by-products from other industries have proven to be a less polluting alternative for concrete production than ordinary Portland cement (OPC). Geopolymers offer many advantages over OPC, such as excellent mechanical strength, increased durability, thermal resistance, and excellent stability in acidic and alkaline environments. Within these properties, mechanical strength, more specifically compressive strength, is the most important property for analyzing geopolymers as a construction material. For this reason, this study compiled information on the different variables that affect the compressive strength of geopolymers, such as Si/Al ratio, curing temperature and time, type and concentration of alkaline activator, water content, and the effect of impurities. From the information collected, it can be mentioned that geopolymers with Si/Al ratios between 1.5 and 2.0 obtained the highest compressive strengths for the different cases. On the other hand, high moderate temperatures (between 80 and 90 °C) induced higher compressive strengths in geopolymers, because the temperature favors the geopolymerization process. Moreover, longer curing times helped to obtain higher compressive strengths for all the cases analyzed. Furthermore, it was found that the most common practice is the use of sodium hydroxide combined with sodium silicate to obtain geopolymers with good mechanical strength, where the optimum SS/NaOH ratio depends on the source of aluminosilicates to be used. Generally speaking, it was observed that higher water contents lead to a decrease in compressive strength. The presence of calcium was found to be favorable in controlled proportions as it increases the compressive strength of geopolymers, on the other hand, impurities such as heavy metals have a negative effect on the compressive strength of geopolymers.

show abstract

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Compressive Strength of Geopolymers: A Review

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Research has been carried out to address the challenges of environmental contamination caused by the disposal of these wastes in landfills [50]. Depending on the use of activators and precursors, an 80% reduction in the footprint of carbon has been observed while using geopolymer [54][55][56][57]. Moreover, a comprehensive survey has been conducted and the results demonstrated that alkali-activated binding materials have high strength, low carbon content, good frost resistance, etc.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Fibers in Geopolymer Concrete: A Comprehensive Review

Sharma,

Gupta,

Bahrami

et al. 2024

Buildings

View full text Add to dashboard Cite

Over the last decades, cement has been observed to be the most adaptive material for global development in the construction industry. The use of ordinary concrete primarily requires the addition of cement. According to the record, there has been an increase in the direct carbon footprint during cement production. The International Energy Agency, IEA, is working toward net zero emissions by 2050. To achieve this target, there should be a decline in the clinker-to-cement ratio. Also, the deployment of innovative technologies is required in the production of cement. The use of alternative binding materials can be an easy solution. There are several options for a substitute to cement as a binding agent, which are available commercially. Non-crystalline alkali-aluminosilicate geopolymers have gained the attention of researchers over time. Geopolymer concrete uses byproduct waste to reduce direct carbon dioxide emissions during production. Despite being this advantageous, its utilization is still limited as it shows the quasi-brittle behavior. Using different fibers has been started to overcome this weakness. This article emphasizes and reviews various mechanical properties of fiber-reinforced geopolymer concrete, focusing on its development and implementation in a wide range of applications. This study concludes that the use of fiber-reinforced geopolymer concrete should be commercialized after the establishment of proper standards for manufacturing.

show abstract

“…Geopolymer concrete (GPC) is estimated to have the capacity to reduce the carbon footprint in construction projects by 80% compared with ordinary Portland cement (Dang et al, 2016). To create a geopolymer with good compressive strength, various variables must be taken into account, including the type of aluminosilicate source, its composition, the composition and concentration of the alkaline activator, the amount of water used, and whether it is cured at ambient temperature or by adding heat (Castillo et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Effects of Alkaline Activator Molarity and Cure Temperature for Geopolymer Synthesized from Alternative Laterite Sources

Oluborode,

Olofintuyi,

Olulope

2023

International Journal of Mechanical and Civil Engineering

View full text Add to dashboard Cite

Geological source material remains one of the options for developing countries to participate in deployment of geopolymer material technology for environmental friendly infrastructure development. Geological source materials for geopolymer are heterogeneous in nature. This study sort to investigate and provide information for aggregation of repository comparative information on geopolymer specimen properties of alternative source material and their response to effect of alkaline activator molarity and cure temperatures. Pulverized 750°c calcined laterite obtained from two alternate sources were activated with alkaline activator solution of NaOH of 8M, 10M, and 12M with NaSiO3 and sterile water of ratio 7:3:3 were properly mixed at activator to source material ratio of 0.45. 50×50×50 specimen cubes were cast for density, porosity and comprehensive strength test for specimen cure at 27°c (room temperature), and 50°c and 90°c in oven temperature respectively for 28 days and 72 hours. The study shows that in each geopolymer specimen source material, the density of the specimen decreases with increased cure temperature while specimen porosity increases with increased cure temperature. Increased activator molarity increases the density of the specimen while specimen porosity does not follow a definite trend with activator molarity. Ekiti parapo pavilion laterite based geopolymer specimen has minimum density, porosity and comprehensive strength of 2.15 g/cm³, 5.27% and 1.74 N/mm². Geopolymer specimen based on polytechnic gate source material have density, porosity and compressive strength minimum values of 1.86 g/cm³, 11.46% and 0.58 N/mm2.. Their corresponding maximum values are respectively 2.40 g/cm³, 19.24% and 14.92 N/mm2 for pavilion based geopolymer specimens, 2.33 g/cm³, 26.08% and 6.90 N/mm².

show abstract

Monitoring Apparent pH Value in Geopolymer Concrete Using Glass Electrode

Cited by 7 publications

References 15 publications

Factors Affecting the Compressive Strength of Geopolymers: A Review

Factors Affecting the Compressive Strength of Geopolymers: A Review

Behavior of Fibers in Geopolymer Concrete: A Comprehensive Review

Comparison of Effects of Alkaline Activator Molarity and Cure Temperature for Geopolymer Synthesized from Alternative Laterite Sources

Contact Info

Product

Resources

About