Printing shell: Use a desktop concrete 3D printer to print hollow permanent templates in sections.
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Construction Precast Development
Precast News From China
Printing shell: Use a desktop concrete 3D printer to print hollow permanent templates in sections.
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In today’s rapidly developing urbanization, construction waste piles up like mountains, and natural sand and gravel resources are gradually depleting.
The use of recycled coarse aggregates prepared from construction waste to produce recycled concrete has become a key strategy for achieving sustainable development in the construction industry.
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Ultra high performance concrete (UHPC) has become an ideal material for high-performance structures such as bridges and landmark buildings due to its excellent strength and durability.
However, behind this’ excellence ‘lies a high environmental cost – the extremely high amount of cement used and the huge carbon footprint caused by raw material extraction.
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In the context of rapid development of precast buildings, the traditional 70mm diameter core sample detection method faces limitations in applicability in thin-walled components.
This article aims to explore the feasibility of using 50mm diameter ultra small core samples to test the compressive strength of concrete through experimental research, analyze the influence of core sample diameter on the test results, and provide experimental basis for revising the testing standards.
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In the spirit of being responsible for engineering quality, our company has put forward higher requirements for concrete production in this stage and developed a comprehensive winter construction technology plan: during the winter concrete construction process, our company uses antifreeze and water reducing agents, reduces water cement ratio and other methods to prepare concrete, and increases efforts in raw materials, production process, quality control and other processes to ensure that the quality risks of concrete production, transportation, pouring and other links are minimized.
While our company takes technical measures for winter construction of concrete, the pouring, curing, and maintenance of concrete will also have a direct impact on the quality of concrete structures.
In order to prevent quality accidents to the greatest extent possible, the relevant matters are introduced below in order to achieve good results and help you create excellent projects.
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Mineral admixtures have become an indispensable component of concrete, and their use has shifted from simply pursuing economic benefits to a technical means of improving concrete performance.
The physical “filling effect” and chemical “volcanic ash effect” of mineral admixtures, especially the secondary hydration, cause changes in the microstructure of concrete, improve the compactness of concrete, and promote the improvement of later strength.
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In the post architectural era, AAC is not facing the question of whether it can survive, but rather the question of how to change its way of living.
Its way out does not lie in catering to all grand trends, but in finding its niche and being irreplaceable in these specific fields.
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On October 11th, during the “High Quality Completion of the 14th Five Year Plan” series of press conferences organized by the State Council Information Office, the Ministry of Housing and Urban Rural Development introduced the application of new materials, and a concrete that can “cure diseases” on its own unexpectedly became the focus – “self-healing concrete” was explicitly mentioned as a model for improving building performance.
This kind of material that sounds like “black technology” is no longer a laboratory concept, but is quietly changing the buildings around us.
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The author of this book, Burrows, has been engaged in concrete durability research at the United States Bureau of Reclamation (USBR) since 1946.
He conducted 53 years of observation, testing, and research on 104 concrete experimental panels at Qingshan Dam in Colorado.
Based on extensive practice, he put forward many unique viewpoints, opinions, measures, and suggestions to improve concrete durability, which have important inspirations for the quality control and technological development of modern concrete engineering.
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There is no fixed “most suitable” standard for concrete slump, and its value needs to be determined comprehensively based on specific engineering requirements, construction conditions, concrete types, and transportation methods.
The core principle is to ensure the strength and durability of concrete after hardening while meeting construction and workability requirements.
The following provides specific explanations from two aspects: key influencing factors and common reference ranges:.