Property and Microstructure of Waterborne Self-Setting Geopolymer Coating: Optimization Effect of SiO2/Na2O Molar Ratio

Mu, Song; Liu, Jianzhong; Liu, Jiaping; Wang, Yaocheng; Shi, Liang; Jiang, Qian

doi:10.3390/min8040162

Cited by 16 publications

(6 citation statements)

References 28 publications

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“…Compared to organic coatings, inorganic coatings, including silicate-based, − geopolymer-based, , and carbonate-based − coatings, are shown to have higher hardness and durability. The silicate-based and carbonate-based coatings are achieved by the hydration of cementitious materials and the biomineralization of bacillus, respectively, on the surface of the concrete substrate, which necessitates a relatively long time to ensure a dense protective layer.…”

Section: Introductionmentioning

confidence: 99%

Carbon-Absorbing Inorganic Coating with Ultrahigh Bonding Strength for Concrete: Bonding, Durability Performances, and the Underlying Mechanisms

Huang,

Lei,

Liu

et al. 2024

ACS Sustainable Chem. Eng.

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Inorganic coatings are widely used to protect concrete structures due to their high durability. However, improving the antipenetration performance and bonding strength of these coatings remains a challenge. This study aims to develop an inorganic coating with excellent performances using high-carbonation reactivity γ-dicalcium silicate (γ-C2S) and delve into the underlying mechanisms. This γ-C2S coating exhibits an excellent bonding strength of 5.25 MPa to the concrete substrate by absorbing CO2 and demonstrates great durability, with a bonding strength retention of 90% after 28 days of irradiation. Compared to the noncoated concrete, the capillary water absorption of the coated concrete has decreased by 58%, while the contents of free and total chloride ions in the coated concrete substrate have decreased by 68 and 60%, respectively. Furthermore, the phase assembly and pore structure of the γ-C2S coating were investigated to understand the antipenetration and bonding mechanism. A connecting section was revealed, which positively impacts the bonding strength between the coating and the substrate. This coating-to-substrate interface interaction was further explored to elucidate the underlying mechanisms of the bonding performance of the γ-C2S coating to the concrete substrate.

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Section: Introductionmentioning

confidence: 99%

Carbon-Absorbing Inorganic Coating with Ultrahigh Bonding Strength for Concrete: Bonding, Durability Performances, and the Underlying Mechanisms

Huang,

Lei,

Liu

et al. 2024

ACS Sustainable Chem. Eng.

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“…In recent years, the geopolymers have been used in geotechnical engineering elds, such as durable materials, infrastructure construction related to foundation and slope engineering [31], and building materials such as replacing cement [32]. The growth in population and urbanization has led to a signi cant surge in concrete demand [33].…”

Section: Introductionmentioning

confidence: 99%

Eco-efficient recycling of engineering muck for manufacturing low-carbon geopolymers assessed through LCA: Exploring the impact of synthesis parameters of the performance

Yuan,

Liang,

Huang

et al. 2024

Preprint

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The construction industry's excessive reliance on cement has led to significant environmental concerns. With the push towards global low-carbon and sustainable development goals, there is an urgent need to find building materials that can replace cement. In this study, engineering muck (EM) produced by foundation pit engineering in subtropical area was used as raw material. The properties of EM were activated by pre-treatment methods to prepare low-carbon geopolymers. This study investigated the effects of synthesis parameters (SiO2/Na2O ratio and liquid-solid ratio) on the performance of the alkaline activated EM-based geopolymers. The results showed that the geopolymer with a SiO2/Na2O ratio of 1.5 achieved the highest compressive strength of 40 MPa in 7 days, exhibiting the densest structure and fewest cracks. In addition to also having the smallest pore sizes and highest thermal stability, indicating optimal pore structure for minimizing evaporation. This study showed that increasing the liquid-solid ratio refined the pore structure, but increased carbonate formation and mass loss at elevated temperatures. Moreover, a life cycle assessment (LCA) was used to compare the cradle-to-gate environmental impacts of the EM-based geopolymers and cement concretes, including global warming and acidification. The LCA demonstrated the CO2 and SO2 emissions of EM-based geopolymers were reduced by 4–26% and 8–19%, respectively, compared to concrete. This study suggests the use of alkaline activation technology to transform the EM into the geopolymers should be expected to become a substitute for concrete, providing a new type of green building material for the geotechnical engineering.

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“…While, other geopolymer source materials can be found as natural minerals such as clays, kaolinite, etc. GPs are frequently produced from materials possessed alkali-activated aluminosilicates compounds without or with calcium elements [7]. According to alkali-activated aluminosilicate technology, geopolymers show lower energy consumptions and thus result in lower CO2 compared to conventional cement (OPC).…”

Section: Introductionmentioning

confidence: 99%

Evaluating the Impact of Inclusion Metakaolin and Silica Fume on the Green and Mechanical Properties of Low Calcium Fly Ash Concrete

Al-Qutaifi¹,

Ethaib²,

Awei³

2022

ACSM

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Generally, low calcium fly ash concretes (FFACs) subjected to ambient temperatures exhibit low initial strengths. Thus, FFACs require higher temperatures to improve the monomer dissolutions, but that increases the energy consumption. Thus, this paper aims to evaluate the influence of the incorporation of different dosages of silica fume (SF) and metakaolin (MK) on the green and hardened properties of FFACs cured at room temperature of 21 ˚C. Slump and air content tests were applied to evaluate the green characteristics of the designed geopolymer concrete mixes (GPCMs). The hardened properties of FFACs were assessed in terms of compressive, flexural, and splitting tensile strengths at different curing ages. Outcomes revealed that the slump and air content of GPCMs declined with improving SF or MK percentages. The 28 days flexural, compressive, and splitting tensile strengths of FFACs manufactured with the optimum dosages of 20% MK and 10% SF cured at 21 ˚C were evidently higher than those of FFACs (100 % FFA) subjected to curing temperatures ranging from 10-to-50 ˚C. Also, the strength enhancement of MK was relatively comparable to those of SF with less requirement for superplasticizers.

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Property and Microstructure of Waterborne Self-Setting Geopolymer Coating: Optimization Effect of SiO2/Na2O Molar Ratio

Cited by 16 publications

References 28 publications

Carbon-Absorbing Inorganic Coating with Ultrahigh Bonding Strength for Concrete: Bonding, Durability Performances, and the Underlying Mechanisms

Carbon-Absorbing Inorganic Coating with Ultrahigh Bonding Strength for Concrete: Bonding, Durability Performances, and the Underlying Mechanisms

Eco-efficient recycling of engineering muck for manufacturing low-carbon geopolymers assessed through LCA: Exploring the impact of synthesis parameters of the performance

Evaluating the Impact of Inclusion Metakaolin and Silica Fume on the Green and Mechanical Properties of Low Calcium Fly Ash Concrete

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