Fiber reinforced alkali-activated slag foam concretes containing recycled aggregates produced using Petrit-T: An application of acoustic panels for indoor walls
Author(s): Mohammad Mastali, Paivo Kinnunen, Marjaana Karhu, Zahra Abdol-
lahnejad, Mirja Illikainen
Paper category: Proceedings
Book title: International Conference on Sustainable Materials, Systems and Structures (SMSS 2019) Energy Efficient Building Design and Legislation
Editor(s): Marina Bagarić, Ivana Banjad Pečur, Hartwig M. Künzel
Publisher: RILEM Publications SARL
Publication year: 2019
Total Pages: 09
Abstract: This paper presents experimental results regarding the efficiency of using acoustic panels made with fiber reinforced alkali-activated slag foam concretes containing lightweight recycled aggregates produced using an industrial side stream, Petrit-T. Process was developed in a laboratory setting, and its scalability was assessed by an industrial pilot: 50 acoustic panels with dimension 500×500×35 mm were produced using a common concrete production line and used to cover the indoor walls in a reverberation room. The acoustic absorption in diffuse field conditions was measured and the interrupted random noise source method was used to measure the sound pressure decay rate over time.
Since the rate of the drying shrinkage could be high for alkali-activated slag foam concretes and this increased greatly the possibility of crack formation, the rate of the drying shrinkage was also evaluated by using some prismatic beams with dimension 40×40×160 mm. Additionally, the negative effects of high rate of drying shrinkage on the crack formation of acoustic panels were monitored visually.
This investigation demonstrated the production feasibility of the acoustic panels made with fiber reinforced alkali-activated slag foam concretes using a common concrete production line. Furthermore, the experimental results showed that the panels exhibited good acoustic properties to absorb the sound. Moreover, the results indicated that the maximum acoustic absorption coefficients for the panels could be varied in the range of 0.5–0.6 in the high frequency regions (4000-5000 Hz). The rate of the drying shrinkage was limited to 0.25% after 1100 hours and no localized crack was detected on the surface panels.
Online publication: 2019
Publication type : full_text
Public price (Euros): 0.00
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