Article
Construction & Building Technology
Khurram Shahzad, Zhonghu Zhao
Summary: The addition of discarded scrap tires can pose serious environmental and health risks. However, these risks can be mitigated by partially replacing crumb rubber in concrete with fine aggregate. This study investigates the impact of pretreating crumb rubber with different concentrations of sodium hydroxide for varying durations. The mechanical performance of hardened concrete was used to evaluate the effect of pretreatment. The results show that pretreatment negatively affects the strength of the concrete at low dosages of crumb rubber, but can aid in recovering strength at high dosages. Additionally, a numerical relation between the mechanical characteristics of crumb rubber concrete has been developed, showing a strong correlation.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Crystallography
Hamad Hassan Awan, Muhammad Faisal Javed, Adnan Yousaf, Fahid Aslam, Hisham Alabduljabbar, Amir Mosavi
Summary: The study evaluates the mechanical performance of untreated and treated crumb rubber concrete, showing that treatment can enhance the mechanical properties. Lime treatment is the most effective, while detergent treatment is the least effective.
Article
Chemistry, Physical
Pretta Malaysia Appana, Bashar S. Mohammed, Isyaka Abdulkadir, M. O. A. Ali, M. S. Liew
Summary: The weak bond between crumb rubber and hardened cement paste is a primary cause of the low mechanical properties of rubberized concrete. This study aimed to develop models for predicting the mechanical and shrinkage properties of NaOH-pretreated crumb rubber concrete (NaOH-CRC) and conducted multi-objective optimization. The results showed that higher crumb rubber replacements led to lower mechanical strengths and higher shrinkage, but the strength loss and shrinkage significantly reduced after the pretreatment. The developed models had high R-2 values and the optimization yielded favorable NaOH and crumb rubber levels.
Article
Construction & Building Technology
Yang Li, Xianbing Yang, Peng Lou, Ruijun Wang, Yanlong Li, Zheng Si
Summary: This study investigated the sulfate attack resistance of recycled aggregate concrete with NaOH-solution-treated crumb rubber. The results showed that the addition of CR particles could improve the sulfate attack resistance of recycled aggregate concrete, with a more significant effect observed for the NaOH-solution-treated CR particles.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Muhammad Ashar Ul Aleem, Muhammad Shahid Siddique, Syed Hassan Farooq, Muhammad Usman, Muhammad Hamza Ahsan, Manzoor Hussain, Asad Hanif
Summary: Rubber decomposition is slow and harmful to the environment and public health. Adding waste rubber to green concrete can alleviate this environmental issue. In this study, the use of waste quarry dust (WQD) for pretreating crumb rubber was investigated to enhance the mechanical properties of concrete. The results showed that treated rubber exhibited better performance than untreated rubber in certain aspects.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Rui Xiao, Zhenglai Shen, Ruizhe Si, Pawel Polaczyk, Yucen Li, Hongyu Zhou, Baoshan Huang
Summary: The addition of crumb rubber to alkali-activated materials has both positive and negative effects. It reduces electrical conductivity and sulfate expansion, while increasing freeze-thaw durability. However, the low Young's modulus of crumb rubber impairs compressive strength and shrinkage control. The alkali-activation process can treat the crumb rubber aggregate simultaneously.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Construction & Building Technology
Rida Alwi Assaggaf, Mohammed Maslehuddin, Salah Uthman Al-Dulaija, Mohammed A. Al-Osta, Mohammed Rizwan Ali, Mohammed Shameem
Summary: This paper investigates the effect of different treatment methods on crumb rubber concrete (CRC) and finds that cement coating is the most effective method in improving its mechanical properties. The cement coating significantly enhances CRC's compressive and flexural strength while also reducing costs.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Green & Sustainable Science & Technology
Julia Nowak, Roman Jaskulski, Wojciech Kubissa, Bartlomiej Matusiak, Maciej Banach
Summary: This study investigated the strength and thermal properties of concrete with crumb rubber from used tyres replacing part of the aggregate. The results showed a decrease in compressive strength and improved insulation properties with an increase in rubber content. A thermomechanical index was introduced to evaluate the functionality of the concrete, and only three out of twelve series failed to meet the performance requirements.
Article
Chemistry, Physical
Robert B. Ataria, Yong C. Wang
Summary: Despite extensive research studies, recycled aggregates and worn-out tyres are still not fully reused. This study focuses on the workability, mechanical properties, and durability performance of concrete made with 100% recycled aggregates and crumb rubber. The results reveal that incorporating 5% crumb rubber improves the workability and mechanical properties of recycled aggregate concrete, but reduces its compressive strength. The durability performance suggests the use of rubber recycled aggregate concrete for applications where exposure conditions are not extreme.
Article
Green & Sustainable Science & Technology
Avijit Pal, Khondaker Sakil Ahmed, F. M. Zahid Hossain, M. Shahria Alam
Summary: This study proposes machine learning-based models to predict the compressive strength of fiber-reinforced rubberized recycled aggregate concrete (FR3C) and explores the internal dependencies among its constituents. The results show that the CatBoost model has the highest prediction accuracy and the lowest errors.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Construction & Building Technology
Bochao Sun, Wenjun Cui, Gaoyang Liu, Biao Zhou, Weijian Zhao
Summary: This study introduces an AutoML-SHAP strategy for automated prediction of concrete compressive strength and interpretability of the results. The AutoML-SHAP model outperforms other machine learning models in predicting compressive strength without human intervention.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Construction & Building Technology
Chellakavitha Nagarajan, Prabavathy Shanmugasundaram
Summary: This study investigates the use of modified clay treated rubber particles partially replacing cement and mixed with silica fume to obtain higher strength in rubberized concrete, making it suitable for structural elements.
STRUCTURAL CONCRETE
(2022)
Article
Construction & Building Technology
Honggen Chen, Xin Li, Yanqi Wu, Le Zuo, Mengjie Lu, Yisong Zhou
Summary: In this study, a LSTM model was proposed to predict the compressive strength of high-strength concrete (HSC) and compared with the traditional SVR model. The results showed that the LSTM model had higher prediction accuracy and reliability, and could be used for pre-estimation of concrete compressive strength before laboratory compression tests.
Article
Construction & Building Technology
Junli Liu, Sujeeva Setunge, Phuong Tran
Summary: The modification of rubber surface is effective in enhancing the mechanical performance of concrete with recycled rubber particles. However, there is limited research on 3D-printed cementitious materials. This study investigated the correlation between compressive strength and microstructural property of 3D-printed rubberised mortar. The presence of hardened cementitious shells improved the bonding between rubber surface and cement matrix. The anisotropy in compressive strength was influenced by the ratio of cement to rubber.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Computer Science, Interdisciplinary Applications
Yasunobu Nohara, Koutarou Matsumoto, Hidehisa Soejima, Naoki Nakashima
Summary: This study used the SHAP method to interpret a gradient-boosting decision tree model, proposing new techniques for better interpretability. Experimental results on hospital cerebral infarction data showed consistency between SHAP and existing methods, highlighting the importance of A/G ratio in predicting cerebral infarction.
COMPUTER METHODS AND PROGRAMS IN BIOMEDICINE
(2022)