In the relentless pursuit of durability and sustainability in construction materials, a groundbreaking study has emerged from the labs of Henan Polytechnic University and Pingdingshan University, led by Guangling Shi. The research, published in the journal Developments in the Built Environment, explores a novel method to enhance the carbonation resistance of sulphoaluminate cement (SAC), a material widely used in grouting applications due to its rapid setting and high early strength. The findings could have significant implications for the energy sector, where infrastructure often faces harsh, high-CO2 environments.
Sulphoaluminate cement has long been valued for its quick setting time and robust initial strength, making it ideal for various construction applications. However, its susceptibility to carbonation in high-CO2 environments has been a persistent challenge, limiting its broader use. Carbonation can lead to structural deterioration, compromising the integrity of buildings and infrastructure over time. This is particularly problematic in the energy sector, where pipelines, storage facilities, and other critical infrastructure are often exposed to elevated CO2 levels.
Shi and his team set out to address this issue by exploring the enhancement of SAC’s carbonation resistance through in-situ polymerization of acrylamide (AM). The process involves modifying SAC with varying dosages of AM, ranging from 0% to 40%, and then evaluating the material’s carbonation depth, mechanical properties, and microstructure after different carbonation periods.
The results are promising. Samples with 20% or more AM exhibited carbonation depths of less than 3 mm after 28 days of accelerated carbonation. This significant improvement in long-term carbonation resistance opens up new possibilities for SAC in high-CO2 environments.
“The in-situ polymerized polyacrylamide (PAM) forms an interpenetrating organic-inorganic network with the cement hydration products,” explains Shi. “This network enhances both the ductility and strength of the material, making it more resistant to carbonation-induced deterioration.”
Microstructural analysis revealed that the PAM encapsulation of hydration products hinders CO2 contact, while the pore-filling effects reduce CO2 diffusion pathways. This dual action significantly improves the material’s resistance to carbonation, potentially extending the lifespan of structures in high-CO2 environments.
The implications for the energy sector are substantial. Enhanced carbonation resistance could lead to more durable pipelines, storage facilities, and other infrastructure, reducing maintenance costs and improving safety. Moreover, the use of SAC in these applications could be expanded, providing a more sustainable and cost-effective solution for construction in harsh environments.
“This study demonstrates that in-situ polymerized PAM is a promising solution for mitigating carbonation-induced deterioration in SAC,” says Shi. “It could potentially expand the application of SAC in high-CO2 environments, benefiting various industries, including the energy sector.”
As the construction industry continues to seek more durable and sustainable materials, this research offers a compelling solution. The enhanced carbonation resistance of SAC, achieved through in-situ polymerization of acrylamide, could revolutionize the way we build and maintain infrastructure in high-CO2 environments. The findings, published in the journal Developments in the Built Environment, pave the way for future developments in the field, promising a more resilient and sustainable built environment.