Journal of Advanced Concrete Technology Vol. 18, 633-647, October 2020 / Copyright © 2020 Japan Concrete Institute 633 Scientific paper Effects of Perlite, Leca, and Scoria as Lightweight Aggregates on Properties of Fresh and Hard Self-Compacting Concretes Yosef Askari Dolatabad 1* , Reza Kamgar 2 and Mohammad Amin Jamali Tazangi 3 Received 8 March 2020, accepted 15 Octobar 2020 doi:10.3151/jact.18.633 Abstract In this study, the effects of Perlite, Leca, and Scoria as lightweight aggregates have been investigated on the properties of self-compacting concrete at the fresh and hardened phases. For this purpose, the ratio of water to cement and super lubricant were kept constant in the mixing rules. Performance tests, such as Slump flow, J ring, U box, L box, and V- funnel tests, were used to investigate the flow ability, passing ability, and the resistance of concrete against detachment. The results showed that the performance of the witness concrete decreased due to the high water absorption of light- weight aggregate. The mechanical properties of hard self-compacting concrete have also been investigated in this study. A set of experiments, such as compressive strength, tensile strength, flexural strength, water diffusion, water absorption, and also corrosion tests in the sulfate and acid environments, were performed for this purpose. The results indicated that the addition of lightweight aggregate decreased the strength and increased the value of water absorption in all cases. It was also observed that the self-compacting lightweight concrete (SCLC) had less resistance during the compression in comparison with the ordinary self-compacting concrete in sulfate and acid environments. 1. Introduction Concrete is the most important construction material in the building industry due to its impermeability, avail- ability, and reasonable cost. Nevertheless, the high weight of this material, in comparison with other con- struction materials, makes it inapplicable in some cases. Besides, new high-performance construction materials and tools have been developed today with low require- ments for skilled workers (Kamgar et al. 2019, 2020; Maghsoudi and Rahgozar 2009; Askari Dolatabad et al. 2019). Today, the addition of different materials to im- prove the behavior of concrete members has widely attracted the attention of researchers of the field (Chaboki et al. 2019). Developing the various types of self-compacting concrete (SCC), with high performance, and low-weight concrete (LWC) is necessary for fast buildings (Aïtcin 2011; Aydin et al. 2015; Bentur et al. 2001; Kılıç et al. 2003). LWC can decrease the total weight and the total cost of construction for a building. It also can increase the resistance of the building against earthquakes by reducing the dead load of the structure. The addition of lightweight aggregate due to their low specific weight to the ordinary concrete might also de- crease some of the concrete problems such as aggregate separation. Adding these particles to the SCC, which has higher powder materials and lower aggregates, in com- parison with the ordinary concrete, increases its viscos- ity and solves such problems as aggregate separation (Hwang and Hung 2005; Wang 2009). The SCC has excellent advantages such as high efficiency and pro- duction rate and requiring low time for construction. It also is applicable as the in-situ concrete with a suitable performance without the need for vibration. Also, the Low-weight SCC (LWSCC) has a similar advantage (Uysal and Sumer 2011). Ahmad et al. (2019) pre- sented the formulation for using the lightweight aggre- gates as thermal insulation. Azari Jafari et al. (2018) used pozzolanic materials in the SCC and showed that the result of the V-funnel test reduces by adding these materials. Gonen and Yazicioglu (2018) examined the effect of basaltic pumice aggregate on the curing condi- tions of SCLWCs. They concluded that some properties of permeation, such as carbonation and capillary water absorption, got worse. Wan et al. (2018) investigated the effect of Perlite, Scoria, and polystyrene aggregates on the properties of SCC at the fresh and hard phases. In the paper mentioned above, the stress-strain curve for the SCCs was also investigated. The coarse lightweight expanded clay aggregates were used as a replacement for the SCCs by Nepomuceno et al. (2018). They de- picted that a satisfactory performance could be shown with a uniform distribution of lightweight aggregates when the dynamic and static segregation analysis were performed. In this study, the effects of Perlite, Leca, and Scoria on the properties of fresh and hard self-compacting con- crete have been investigated. Many studies have been conducted on the use of different lightweight aggregates 1 Assistant Professor, Department of Civil Engineering, Sirjan University of Technology, Sirjan, Iran. *Corresponding Author: E-mail: [email protected]. 2 Assistant Professor, Department of Civil Engineering, Shahrekord University, Shahrekord, Iran. 3 Master of Science Student, Department of Civil Engineering, Sirjan University of Technology, Sirjan, Iran.
Effects of Perlite, Leca, and Scoria as Lightweight Aggregates on Properties of Fresh and Hard Self-Compacting Concretes
May 03, 2023
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