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"Concrete deterioration"
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Durability design of concrete structures : phenomena, modeling and practice
Comprehensive coverage of durability of concrete at both material and structural levels, with design related issues Links two active fields in materials science and structural engineering: the durability processes of concrete materials and design methods of concrete structures Facilitates communication between the two communities, helping to.
eBook
Damage Mechanics of Cementitious Materials and Structures
The book, prepared in honor of the retirement of Professor J. Mazars, provides a wide overview of continuum damage modeling applied to cementitious materials.
It starts from micro-nanoscale analyses, then follows on to continuum approaches and computational issues. The final part of the book presents industry-based case studies.
The contents emphasize multiscale and coupled approaches toward the serviceability and the safety of concrete structures.
eBook
Geopolymers as sustainable surface concrete repair materials
\"The progressive deterioration of concrete surface structures in a major concern in construction engineering that requires precise repairing. While a number of repair materials have been developed, geopolymer mortars have been identified as potentially superior and environmentally friendly high performance construction materials, as they are synthesized by selectively combining waste materials containing alumina and silica compounds which are further activated by a strong alkaline solution. Geopolymers as sustainable surface concrete repair materials offers readers insights into the synthesis, properties, benefits and applications of geopolymer-based materials for concrete repair.\"
Book
Concrete Ageing Effect on the Dynamic Response of Machine Foundations Considering Soil–Structure Interaction
Purpose
The dynamic responses of a concrete machine foundation under impact load type were studied considering the deterioration of concrete due to chemo-mechanical actions over the ages. This investigation was furtherly implemented considering different soil types from soft to hard types.
Methods
The two-dimensional plain-strain finite element formulations of this coupled problem were written in FORTRAN 90 and MATLAB programming language. The coupled equation of motion for soil–machine foundation interaction problem has been analyzed by direct method. The soil medium was divided into near and far-field domains, where the far-field soil domain included the radiation of reflected dynamic waves discretizing with infinite solid elements.
Results
The dynamic responses of machine foundation are significantly affected by the deterioration of concrete over the ages. The area of extreme stress responses at the foundation increases according to the increments of deterioration in concrete. According to 0 and 50 years age, the stress responses of machine foundation for medium soil type were seen to be decreased to 32.6%. Moreover, the displacement responses of machine foundations increase when the soil type properties vary from hard to soft type.
Conclusion
The deterioration of concrete and the existence of different soil medium have significant effect on the dynamic responses of machine foundations that should be considered in analysis and design.
Journal Article
Self-Healing Concrete as a Prospective Construction Material: A Review
Concrete is a material that is widely used in the construction market due to its availability and cost, although it is prone to fracture formation. Therefore, there has been a surge in interest in self-healing materials, particularly self-healing capabilities in green and sustainable concrete materials, with a focus on different techniques offered by dozens of researchers worldwide in the last two decades. However, it is difficult to choose the most effective approach because each research institute employs its own test techniques to assess healing efficiency. Self-healing concrete (SHC) has the capacity to heal and lowers the requirement to locate and repair internal damage (e.g., cracks) without the need for external intervention. This limits reinforcement corrosion and concrete deterioration, as well as lowering costs and increasing durability. Given the merits of SHCs, this article presents a thorough review on the subject, considering the strategies, influential factors, mechanisms, and efficiency of self-healing. This literature review also provides critical synopses on the properties, performance, and evaluation of the self-healing efficiency of SHC composites. In addition, we review trends of development in research toward a broad understanding of the potential application of SHC as a superior concrete candidate and a turning point for developing sustainable and durable concrete composites for modern construction today. Further, it can be imagined that SHC will enable builders to construct buildings without fear of damage or extensive maintenance. Based on this comprehensive review, it is evident that SHC is a truly interdisciplinary hotspot research topic integrating chemistry, microbiology, civil engineering, material science, etc. Furthermore, limitations and future prospects of SHC, as well as the hotspot research topics for future investigations, are also successfully highlighted.
Journal Article
Durability of Concrete in Cold Climates
This comprehensive and authoritative review of durability of concrete in cold environments will enable concrete materials specialists and practising engineers to understand the mechanisms responsible for deterioration of concrete through freeze/thaw action.
eBook
Experimental Study on Mechanical Properties and Pore Structure Deterioration of Concrete under Freeze–Thaw Cycles
Understanding the evolution of mechanical properties and microscopic pore structure of concrete after freeze–thaw cycles is essential to assess the durability and safety of concrete structures. In this work, the degradation law of mechanical properties and damage characteristic of micro-structure of concrete with two water-cement ratios (w/c = 0.45 and 0.55) is investigated under the condition of freezing–thawing cycles. The influence of loading strain rate on dynamic compressive strength is studied. The microscopic pore structure after frost damage is measured by low-field nuclear magnetic resonance (LF-NMR) technique. Then, a damage model based on the porosity variation is established to quantitatively describe the degradation law of macroscopic mechanical properties. The test results show that the relative dynamic modulus of elasticity (RDME), dynamic compressive strength, flexural strength, and splitting tensile strength of concrete decrease with the increase of freeze–thaw cycles. Empirical relations of concrete dynamic increase factor (DIF) under the action of freeze–thaw cycles are proposed. Moreover, the experimental results of NMR indicate that the porosity as well as the proportion of meso-pores and macro-pores of concrete gradually increased with the increasing of freeze–thaw cycles. The research results can provide reference and experimental support for the anti-frost design theory and durability life prediction of hydraulic concrete structures in cold regions.
Journal Article