Article
Construction & Building Technology
Jamal Khatib, Rawan Ramadan, Hassan Ghanem, Adel Elkordi
Summary: In this study, it was found that replacing 15% of limestone fines can enhance the chemical shrinkage of the paste, while autogenous shrinkage increases between 0 and 10% replacement and sharply decreases at 15% and 20% replacement. Drying shrinkage increases with the increase in limestone fines content, and expansion increases for replacements above 15% limestone fines.
Article
Construction & Building Technology
Christian Herget, Moien Rezvani, Anna Louisa Muller, Tilo Proske
Summary: Substituting limestone powder for Portland cement clinker can reduce the environmental impact and shrinkage of cement. The clay content of limestone has a significant influence on the ad- and desorption behavior, but minor influence on the pore structure. A predictive model is also presented.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Engineering, Civil
Zakaria Skender, Abderrahim Bali, Ratiba Kettab
Summary: This study investigates the use of limestone fines as a replacement material in self-compacting concrete, showing that up to 20% substitution can lead to improved properties in fresh state. Results also indicate enhancements in compressive strength and reduction in water and chloride-ion diffusion at 15% sand replacement, while improvements in compressive strength and chloride ions diffusion were noted at 5% cement replacement.
EUROPEAN JOURNAL OF ENVIRONMENTAL AND CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
Yaqiang Li, Yue Li, Hongwen Li, Hui Lin
Summary: This study explored the effects of carbon nanotubes (CNTs) on the autogenous shrinkage of cement paste and predicted the autogenous shrinkage of CNT-blended cement using different models. Results showed that CNTs can effectively mitigate the autogenous shrinkage of cement paste, and their effectiveness is related to the content and curing time.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
J. J. Chen, B. H. Li, P. L. Ng, A. K. H. Kwan
Summary: The study proposes combining the strategies of sand and cement replacement to reduce the sand and cement contents in concrete, and the tests show that this combined strategy can achieve the goal without impairing performance.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Construction & Building Technology
G. M. Chen, Z. H. Lin, L. G. Li, J. L. He, A. K. H. Kwan
Summary: By using the paste replacement method (PRM) to reuse clay brick waste in concrete production, it has been shown to increase compressive strength and elastic modulus, reduce cement content, and significantly improve the mechanical performance of concrete.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2021)
Article
Construction & Building Technology
M. H. Lai, W. C. Lao, W. K. Tang, L. Hanzic, Q. Wang, J. C. M. Ho
Summary: Superplasticizer (SP), especially poly-carboxylate based, improves the strength and workability limits of cement powder paste by reducing water demand for hydration. However, it also increases viscosity at high shear flow, leading to impaired pumpable distance and mixing uniformity.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Tao Luo, Cheng Hua, Fang Liu, Qiang Sun, Yu Yi, Xiaofeng Pan
Summary: Adding silica fume or high-purity silica fume can decrease the slump and air content of concrete, increase the compressive and tensile strength of concrete, refine the pore structure, and densify the microstructure of concrete.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2022)
Article
Construction & Building Technology
Laurence De Meyst, Els Mannekens, Kim Van Tittelboom, Nele De Belie
Summary: The study suggests that adding SAP as internal curing agents can reduce autogenous shrinkage in cementitious materials, especially in cement paste and high-performance mortar. Poly-acrylate based SAPs significantly reduce autogenous shrinkage and prevent cracking, while sulfonate based SAPs, although not fully eliminating shrinkage, can effectively reduce shrinkage rate.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Construction & Building Technology
Sumaiya Afroz, Yingda Zhang, Quang Dieu Nguyen, Taehwan Kim, Arnaud Castel
Summary: This study examines the shrinkage properties of two sustainable aluminosilicate blends, namely fly ash and limestone-calcined clay (LC3). Paste and concrete samples were tested to determine the maximum replacement of binder while maintaining strength. The study analyzed the chemical and autogenous shrinkage of paste samples, and further investigated hydration using thermogravimetric analysis and Fourier transform infrared spectroscopy. By comparing different types of shrinkage, such as autogenous, drying, and total shrinkage, for concrete with specific compressive strength, the study found that LC3 exhibited higher autogenous shrinkage due to faster hydration compared to fly ash. Despite this, LC3 had lower drying shrinkage, making it a more sustainable and eco-friendly alternative to fly ash concrete when considering cement replacement levels, shrinkage, and ecological impact.
MATERIALS AND STRUCTURES
(2023)
Article
Environmental Sciences
Jamal Khatib, Rawan Ramadan, Hassan Ghanem, Adel ElKordi
Summary: The aim of this study is to investigate the effect of incorporating limestone fine (LF) on the chemical shrinkage of pastes and mortars. The results showed that the long-term chemical shrinkage of pastes increased with the increase in LF content up to 15%, while the chemical shrinkage of mortars decreased beyond a certain LF content. Additionally, the compressive strength of pastes and mortars reached the highest value for mixes containing 10% and 15% LF.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2023)
Article
Engineering, Civil
Rouzbeh Khajehdehi, David Darwin, Muzai Feng
Summary: The cracking of concrete bridge decks is a nationwide problem. The study found that paste content has a dominant effect on cracking, while other factors such as slump, compressive strength, and air content have a smaller impact on cracking.
JOURNAL OF BRIDGE ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Farah Kaddah, Harifidy Ranaivomanana, Ouali Amiri, Emmanuel Roziere
Summary: The accelerated carbonation of recycled concrete aggregates has been suggested as a way to improve their properties. This study investigates the effects of carbonation on cement paste and mortar specimens at different scales. The results show that carbonation leads to the precipitation of different minerals and the development of material stiffness, which in turn affects the microcracking and permeability of the specimens. The formation of calcium carbonate also reduces the porosity and pore sizes.
JOURNAL OF CO2 UTILIZATION
(2022)
Article
Engineering, Civil
Achintyamugdha Sharma, Todd Sirotiak, Matthew L. Stone, Xuhao Wang, Peter Taylor
Summary: The study revealed that larger aggregate sizes and the addition of nanosilica can enhance the durability and mechanical properties of concrete, with a combination of Portland limestone cement and fly ash showing superior performance. Life cycle analysis using the Green Concrete LCA tool also demonstrated the environmental impact of these concrete mixtures.
JOURNAL OF INFRASTRUCTURE SYSTEMS
(2021)
Article
Construction & Building Technology
Huixia Wu, Ruihan Hu, Dingyi Yang, Zhiming Ma
Summary: This study compares the micro-macro characteristics of sustainable mortar using construction waste fines as cement and sand replacement. The results show that waste concrete fines (WCF) and waste brick fines (WBF) exhibit pozzolanic activity, nucleation, and micro-aggregate filling effects. Replacing cement with WCF increases the porous structure while replacing with moderate WBF refines the pore structure; moreover, substituting WCF/WBF for sand refines the pore structure. Using appropriate WCF/WBF as cement replacement reduces drying shrinkage, but using them as sand replacement increases it. Incorporating WCF reduces the strength and permeability resistance, while the addition of WBF first improves and then declines these properties. Mixing WCF and WBF as sand replacement enhances the strength and permeability resistance. WBF blended mortar exhibits superior properties, and substituting WCF/WBF for both cement and sand can prepare sustainable mortar with similar or superior properties to plain mortar.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
