DEVELOPMENT OF LOW COST-LOW CARBON-HIGH STRENGTH-GREEN PERVIOUS CONCRETE FROM STEEL PROCESSING INDUSTRY WASTE

• Main Author: Risnan, Muhammad
• Format: Theses
• Language: Indonesia
• Subjects: Teknik sipil
• Online Access: https://digilib.itb.ac.id/gdl/view/77918
• Institution: Institut Teknologi Bandung

Pervious concrete is a reliable solution for environmentally friendly concrete pavements, especially for densely populated urban areas. Some of the benefits of pervious concrete to the environment are mainly increasing the absorption of water into the soil, so that it can quickly purify rainwater runoff, recharge groundwater, reduce rainwater runoff, and when combined with well-designed drainage system it can minimize the potential of flooding. The uniqueness of this concrete is that it uses few or no fine aggregate at all, with the main composition consisting of coarse aggregate, binder (cementitious/pozzolanic materials), water and admixture. The development of green pervious concrete with steel slag as raw material as coarse aggregate and GGBFS as a partial replacement for cement is carried out to address environmental problems caused by impervious pavement that is commonly used in urban areas, as well as to increase the added value of material by-products of the steel processing industry. The aim of this research is to obtain a pervious concrete mixture with an optimum compressive strength, porosity and permeability utilizing locally available by-products and waste materials from steel processing industry to produce a more sustainable construction material. Efforts were made to vary the specimen due to the influence of aggregate gradation, use of a small percentage of fine aggregate and the influence of the percentage of cement substitute material. Evaluation based on the experimental results shows that the specimen with well graded or blended-size of steel slag coarse aggregates, with a maximum of 10% steel slag fine aggregate, and GGBFS as 32% cement substitute material (CSM) is found to be an optimized mixture in achieving high compressive strength of 20.39 MPa with a porosity value of 18.37% and a permeability of 1.7 mm/s which complies with ACI 522R-10. The parameters of porosity and permeability to the resulting compressive strength show a strong negative correlation, which means that the greater the porosity and permeability, the smaller the compressive strength. Other parameters in SSPC VI show flexural strength results of 2.878 MPa, elastic modulus of 38.004 MPa, and density of 2540.425 kg/m3. In addition, in the Scanning Electron Microscope (SEM) test, hydration products can be seen visually appearing in the test specimen, including phases in the form of tobermorite (calcium silicate hydrate/CSH), portlandite (calcium hydroxide/CH), ettringite (AFt), and mullite with the results of X-Ray Diffraction (XRD) testing at SSPC VI showed the phase content percentages were 27.3%, 8.0%, 15.9% and 29.2%, respectively. These results correspond to the resulting compressive strength, which means that the greater the CSH content, the greater the resulting compressive strength.