The proportion of water to cement/binder and the addition-reducing agent greatly affect the rheological characteristics of cement slurry.
A study established a mathematical model to predict the apparent viscosity of cement slurries with different water-cement/binder ratios and polycarboxylate superplasticizer contents by introducing a power-law shear stress-strain relationship of non-Newtonian fluids into the Navier Stokes equations of motion. The established model was compared with the rheological experimental results, and its accuracy in simulating the apparent viscosity of cement slurry was verified.
These models provide insights into the rheological properties of cement slurry and may have practical applications in the construction industry. The following conclusion has been drawn.
(1) Considering w/b and parameter K in the Ostwald model, an ordinary differential equation was established. The description of the connection between shear stress and shear rate is founded on the Navier-Stokes equation and the Ostwald model.
(2) The first-order Bernstein polynomials with different water-cement/binder ratios were used to approximate the global constitutive relationship of the four-parameter formula for cement slurry in the rheological stage;
(3) Taking into account the effects of both electrostatic repulsion and steric hindrance, a preliminary equation was developed to gauge the viscosity of high-performance water-reducing agents that are made
(4) The established model was validated through multiple rheological experiments with different water ash/binder ratios and high-efficiency water-reducing agent dosages.
It should be noted that the developed model is suitable for the initial mixing stage of cement slurry. Additional investigation is required to examine how various elements, like the hydration level and the inclusion of aggregates and other substances, impact the rheological properties of cement-based mixtures.
A cement water-reducing agent is an important concrete admixture whose main function is to reduce the amount of water used in mixing and improve the strength, rheological properties, plasticity, and other properties of concrete while maintaining the basic unchanged concrete slump. The following are the main manifestations of cement water-reducing agents in application:
Reduce water consumption
Adding an appropriate amount of water-reducing agent can greatly reduce mixing water consumption and improve concrete strength and rheological properties without changing the proportions of various raw materials (excluding water) and the slump of concrete; this can save water resources, reduce the shrinkage rate during the concrete hardening process, and reduce the occurrence of defects such as cracks and voids.
Incorporating a suitable water-reducing agent can optimize concrete production by enhancing its strength while maintaining the original proportions of raw materials, excluding cement; this significantly increases both early and later strength, with improvements of over 60% and 20%, respectively, compared to concrete without such agents; this, in turn, can improve the load-bearing capacity of building structures and extend their service life.
Improving rheological properties
Adding an appropriate amount of water-reducing agent without changing the proportion of various raw materials can significantly improve concrete’s rheological and plastic properties, allowing for self-flow, pumping, and vibration-free construction methods, improving construction speed and reducing construction energy consumption; this can improve construction efficiency, shorten the construction period, and reduce project costs.
Production performance cement
Adding multiple performance-enhancing substances to concrete mixtures can produce remarkable results, including delayed setting for high-strength concrete, increased strength for high-strength concrete, and unparalleled durability for ultra-high-strength concrete. These agents enhance the concrete’s performance by reducing the water required, resulting in improved strength and durability. Water-reducing agents for producing high-performance concrete are easy to operate, flexible to use, and economical; this can meet the requisitions of different projects and improve project quality and economic benefits.
Concrete water-reducing agent supplier
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