Improvement Mechanism of the Mechanical Properties and Pore Structure of Rubber Lightweight Aggregate Concrete with S95 Slag

Zihao Guo, Hailong Wang (), Song Sun, Shuai Feng, Libin Shu and Chao Tang
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Zihao Guo: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
Hailong Wang: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
Song Sun: Gansu Provincial Seismological Bureau, Lanzhou 730000, China
Shuai Feng: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
Libin Shu: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
Chao Tang: College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China

Sustainability, 2023, vol. 15, issue 2, 1-11

Abstract: This paper used natural pumice from the Inner Mongolia region as coarse aggregate to produce a lightweight concrete mix with a 3% rubber particle (20 mesh) content and dissimilar slag contents (0%, 5%, 10%, 15%, 20%, 25%, and 30%). It measured the compressive strength in five periods (3, 7, 14, 21, and 28 d). It also observed the development of the microstructure and measured the air content and pore distribution of the concrete using environmental scanning electron microscopy and nuclear magnetic resonance. A microtest combined with macroscopic mechanical experiments were used to analyze the influence on the mechanical properties of the rubber lightweight aggregate by the content of the S95 slag. The results showed that slag can improve the microstructure of rubber lightweight aggregate concrete. It hydrated the products, optimized the porous structure, and enhanced the compressive strength of the rubber lightweight aggregate concrete at 28 days, with excellent results regarding the air entraining. The best compressive strength of the rubber powder lightweight aggregate concrete at 28 days was when the content of the slag was 15%. An Atzeni pore-structure–strength model was introduced that contained a cement mass fraction. The results of the fitting indicate that the pore structure located at 0.1~1 μm had a marked influence on the mechanical properties of the rubber powder concrete.

Keywords: S95 slag; waste rubber powder; pore structure; compressive strength (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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