Reinforced Spun Concrete Poles—Case Study of Using Chemical Admixtures

Abstract

The current research paper is focused on the experimental investigation of features of chemical admixtures (superplasticizers C-3, ‘Dofen’ and formaldehyde resin ACF-3M) utilizing in reinforced spun concrete structures. For the sake of comparison, the results of studying the effects of chemical admixtures on physical and mechanical properties on vibrated and spun concrete are provided. As a separate part of spun concrete products, the supporting poles of overhead power lines are introduced. The results obtained indicate, that the positive effect of chemical admixtures for spun and vibrated concrete is most pronounced at an early age of concrete. The effective amount of chemical admixtures for spun concrete is 0.15% of cement mass when formaldehyde resin ACF-3M and 1% of cement mass when superplasticizers C-3 and ‘Dofen’ are used. Moreover, the brief review about the reinforced spun concrete members is provided.

The Reinforced Spun Concrete Poles under Physical Salt Attack and Temperature: A Case Study of the Effectiveness of Chemical Admixtures

“…Speaking about spun concrete products (including the supporting poles of overhead power lines), it should be mentioned that their production technology is specific, which results in the different concrete structure and texture and a smaller value of the residual water-cement ratio (W/C) residual than those in regular vibrated concrete [ 24 ]. The performed tests have shown the high resistance and reliability of spun concrete structures [ 25 ].…”

“…One of the effective measures to improve the durability of concrete is using water-soluble chemical admixtures [ 26 , 27 , 28 ]. As shown by the research, chemical admixtures can decrease the initial water-cement ratio, not decreasing such concrete properties as workability and slump [ 24 ]. Positive qualitative mechanical characteristics of spun concrete with these admixtures are well known, but the behavior of these structures under long-term exposure to the salt environment and temperature changes have not been sufficiently investigated.…”

“…A series of previous papers by the authors analyzed the influence of chemical admixtures on the reinforced spun concrete elements-supporting poles of the overhead power transmission lines [ 24 ]. The present paper is focused on the investigations of the effects of various chemical admixtures on the strength and deformability parameters of the spun concrete under the combined long-term unfavorable physical actions of the aggressive salt-saturated groundwater and the great amplitude of the temperature changes during the day and night time (up to 50–60 °C).…”

Assessment of Internal Structure of Spun Concrete Using Image Analysis and Physicochemical Methods

“…Kliukas, Jaras, and Lukoševičienė in [6] found that each phase of the concrete centrifugation process has a specific rotational speed, which depends on the dimensions of the element and the time needed to obtain the selected speed. According to [6], the duration of the first phase should be 3-4 min, the second and third phase should be 1-2 min, and the fourth phase should be 10-15 min.…”

“…Kliukas, Jaras, and Lukoševičienė in [6] found that each phase of the concrete centrifugation process has a specific rotational speed, which depends on the dimensions of the element and the time needed to obtain the selected speed. According to [6], the duration of the first phase should be 3-4 min, the second and third phase should be 1-2 min, and the fourth phase should be 10-15 min. It should be noted that the centrifugation time of an element in a steel form also depends on the initial water-cement ratio of the concrete mix and the pressure caused by centrifugal force, depending on the rotational speed and the diameter of the product.…”