Related Experiment Video
Updated: May 14, 2025

Analyzing Multifactorial RNA-Seq Experiments with DiCoExpress
Published on: July 29, 2022
Comparative Analysis of CO2 Resistance on NaOH-Activated and Na2C2O4 + Ca(OH)2-Activated Geopolymers
Shenglai Guo1, Rong Wang1, Ye Zhang2
1Key Laboratory of Unconventional Oil & Gas Development (China University of Petroleum (East China)), Ministry of Education, School of Petroleum Engineering, China University of Petroleum (East China), Qingdao 266580, China.
Abstract:
The combination of Na2C2O4 and Ca(OH)2 acts as an eco-friendly alkaline activator characterized by low alkalinity, reduced carbon footprint, and controllable thickening behavior. Calcium oxalate, a byproduct of the Na2C2O4 and Ca(OH)2 reaction, may enhance the CO2 resistance of geopolymers. In this study, we compared the CO2-resistant performance of geopolymers activated by Na2C2O4 + Ca(OH)2 and NaOH under high-temperature conditions (110 °C, 5 MPa CO2). Fly ash sinking beads and slag were used as precursors. Trends in alkalinity and strength variations were recorded, and changes in microscopic composition were analyzed via XRD, FTIR, and DTG. The results demonstrated that after 21 days of CO2 exposure, the compressive strength of geopolymers activated by either NaOH or Na2C2O4 + Ca(OH)2 increased by 7.14-22.58%. Notably, both activators exhibited no significant difference in the CO2 resistance. Extending the pre-exposure curing time more effectively enhanced the geopolymers' CO2 resistance, with samples cured for 7 days exhibiting 28.9-34.2% higher compressive strength than those cured for 1 day. Fourier-deconvolution spectroscopy analysis revealed that N-A-S-H gels displayed superior CO2 resistance compared to C-A-S-H gels.
Related Concept Videos
Assessment of Diffusion and Perfusion
The Role of Diffusion in Respiration
Diffusion is the process by which molecules move from an area of higher concentration to an area of lower concentration. In the respiratory system, this...
Oxygen Transport in the Blood
Hypoxia
Types of Hypoxia
There are four primary types of hypoxia, each resulting from a different cause:
1. Anemic hypoxia: This type occurs due to insufficient oxygen delivery caused by a lack of red blood cells (RBCs) or RBCs with abnormal or...
Carbon Dioxide Transport in the Blood
Forms of CO2 Transport
1. Dissolved in plasma: A small percentage (7-10%) of CO2 is transported and dissolved directly in the plasma.
2. Carbaminohemoglobin: Just over 20% of CO2 is chemically bound to...
Multiple Comparison Tests
It would be easy to compare two samples using a significance alpha level of 0.05. In other words, there is only one sample pair to be compared. However, it would be difficult to identify a significantly different sample if the number...
Chronic Obstructive Pulmonary Disease-IV: Assessement and Diagnostic Studies
Medical History

