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Director of Shahid Rajaei Concrete Research Center
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سرباز وظیفه نخبه
Abstract
Superplasticizers are among the most important concrete additives that will improve the flow of fresh concrete by reducing its viscosity and yield stress. One of the most commonly used superplasticizers in the concrete industry are polycarboxylate-based superplasticizers. As a result of being absorbed on the surface of cement particles, these materials prevent particles from sticking together in concrete with the mechanism of spatial hindrance and improve its flow. In the conducted research, the effect of five types of superplasticizers on the properties of fresh and hardened mortar and concrete was investigated. The obtained results show that based on chemical tests, all five types of polycarboxylate superplasticizers are the same with functional groups and their differences are in molar mass and the length of their side branches. Is. Finally, according to the performance of all five types of superplasticizers, it was found that with the increase in the length of the polymer chain and the length of the side branches, as well as the increase in the percentage of superplasticizer solids, the viscosity of plastic mortar and concrete decreases. Because the steric hindrance of polymer chains absorbed on the surface of cement particles increases and the possibility of accumulation of these particles, which reduces the flow of concrete, decreases. Due to the use of anti-foam additive, the air trapped in the concrete is reduced, but by increasing its amount from an optimal value, the water permeability of concrete increases and its efficiency decreases.
ghanbari, M., & Tehranchi, M. (2023). The investigation of Polycarboxylate process parameters on concrete properties. Construction science and technology, 3(4), 31-37.
MLA
mohammadali ghanbari; Mohammadreza Tehranchi. "The investigation of Polycarboxylate process parameters on concrete properties", Construction science and technology, 3, 4, 2023, 31-37.
HARVARD
ghanbari, M., Tehranchi, M. (2023). 'The investigation of Polycarboxylate process parameters on concrete properties', Construction science and technology, 3(4), pp. 31-37.
VANCOUVER
ghanbari, M., Tehranchi, M. The investigation of Polycarboxylate process parameters on concrete properties. Construction science and technology, 2023; 3(4): 31-37.
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