| dc.description.abstract | In recent years, the global environmental protection has risen in the development of industry and changes of environment. Promoting the technology of carbon capture and storage in the world, and the way how to consume the carbon dioxide could become a part of the research.
Using pervious concrete is one of the recommended methods to reduce the urban heat island effect. However, the pervious concrete is not so wide at all and the strength of pervious concrete is much lower than general concrete because of the permeability requirement. The research tried to produce a high strength pervious concrete and use carbon dioxide for curing to find out whether it could enhance the compressive strength.
Two dimensions of cylinders are Φ10×20 cm and Φ15×30 cm samples for testing compressive strength, elastic modulus, abrasion resistance, X-ray diffraction (XRD) and Scanning Electron Microscope (SEM).
The results show that the compressive strength of the control group increases rapidly and its 90-day compressive strength closed to 60 MPa. Although the porosity is less than 15%, the permeability coefficient complies with the regulations of ACI 522. The compressive strength has a major impact after 1 hour of CO2 curing and their strength decreased by about 0% to 23% as compared to the control group. This result is similar to the value of literature-based recommendation, 12000, and the aggregate with small particle size has a higher modulus of elasticity. The test results showed that abrasion resistance of high strength pervious concrete is about 0.06% weight loss less than the normal concrete and has excellent abrasion resistance properties. XRD analysis showed that the surface product of the test piece decreased with the increase of age, for example calcite, aragonite, vaterite, portlandite, quartz and ettringite, but the peak value has no obvious relationship with both the pressure and time of CO2 curing. SEM analysis revealed that the surface product of the test piece, such as ettringite, was increased after CO2 curing. | en_US |