Flow simulation of self-consolidating concrete through V-funnel for sustainable buildings

Abstract

Self-consolidating concrete (SCC) is one of the trending low-yield stress material innovations of the new age building industry due to its ability to flow through heavily reinforced structural members without segregation and without losing its moderate viscosity. In this research paper, a V-funnel simulation has been developed for the flow time to establish its validity with allowable design conditions according to the European standard. The Bernoulli’s equation and the continuity flow state conditions were adopted for the V-funnel of 515 mm upper width, 75 mm thick, and vertical dimensions (depth) of 450 mm and 150 mm for the V-section and funnel duct (75 mm × 65 mm) respectively. Concrete shear stress with the funnel wall was considered as a factor of concrete unit weight (ρ) and frictional force under downward velocity with respect to variational height (dh). The result of the V-funnel simulation for the flow time shows that the kinematic viscosity (η) of the concrete is bound within the limits of 0 and 1/64. This implies that ηmin ≈ 0 (no friction with walls), and the minimum flow time (Tmin) becomes 8.7 sec while minimum shear stress is zero (τmin ≈ 0 N/m2). However, for ηmax ≈ 1/64 (maximum friction with walls of τmax τ ρ/64 N/m2 is attained) and Tmax becomes 18.9 sec. These values fall within the flow time after 10 seconds of mixing, ranging between 8 and 10 seconds, and the flow time after 5 minutes of mixing of 11 to 25 seconds, according to the European Guidelines for self-consolidating concrete. These results for the flow simulation of the concrete placement during construction, are also consistent with the United Nations sustainable development goals (SDGs) for technological innovation, infrastructure, and sustainable cities.

Numerical modeling of the funnel multiphysical flow of fresh self-compacting concrete considering proportionate heterogeneity of aggregates

“…The Bingham plastic model is commonly used to describe the flow behavior of materials that exhibit a yield stress, such as fresh self-compacting concrete (SCC) 11 . The model assumes that the material behaves as a solid until a certain stress threshold, known as the yield stress, is exceeded 13 .…”

“…This can help you understand how variations in aggregate heterogeneity affect the flow behavior of SCC. By incorporating aggregate heterogeneity into the numerical simulation of V-funnel flowability, you can gain insights into the impact of aggregates on the workability and flow characteristics of SCC 1,11 . This information can be valuable for optimizing mix designs and improving the performance of selfcompacting concrete in practical applications 4 .…”

“…Additionally, experimental validation and further analysis may be necessary to fully evaluate the impact of aggregate heterogeneity on SCC flowability.When considering the numerical modeling of V-funnel flowability of fresh self-compacting concrete (SCC) while incorporating the heterogeneity of aggregates, coupling ANSYS with SPH can be a challenging task due to the different numerical methods employed by each software 2-8 . However, I can provide a general strategy that combines the two methods to simulate the flow behavior of SCC with heterogeneous aggregates in the V-funnel: (a) preprocessing: create the geometry of the V-funnel and define the boundary conditions in ANSYS [11][12][13][14] . Define the material properties and constitutive models for the SCC mixture in ANSYS.…”

Compressive strength optimization and life cycle assessment of geopolymer concrete using machine learning techniques

“…Portland Cement is the most popular building material used throughout the construction industry. cement consumption is also increasing as a result of rising urbanization in emerging nations [8][9][10]. Cement production has a lot of environmental consequences.…”

“…They cannot be dumped in the water, and dumping them on land pollutes the environment. This sparked interest in developing Geopolymer Concrete (GPC), an alternative building material generated from industrial waste [9]. GPC is a relatively innovative green building material that is gaining popularity.…”