Precast News From China
Concrete is the flesh and blood of construction engineering, and mixing is the first key process that determines the performance of concrete.
Many engineering quality issues are rooted in the mixing process.
Today we will start from the importance and influencing factors of mixing, and talk about the core points of concrete forming.
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Concrete is mainly composed of cement, mixed with several powdered mineral admixtures, water, and additives to form a binder slurry.
Scattered sand and stone are evenly mixed and poured into various models such as beams, columns, and slabs, firmly bonded into a whole engineering material.
In the process of preparing and producing concrete, in addition to requiring the uniformity of the cement-based binder slurry itself, it is also required to separate each sand and stone particle with the slurry through mixing, and then use construction techniques such as vibration to achieve the closest accumulation of sand and stone, and firmly bond them together with the binder.
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In cold northern regions and extreme climate conditions such as high altitude and high latitude, winter concrete construction faces the problem of the impact of low temperature environment on the development of concrete strength, durability, and structural safety.
Low temperature can significantly reduce the hydration reaction rate of concrete, slow the early strength growth, and even cause freezing damage, seriously affecting the engineering quality and service life.
With the continuous advancement of infrastructure construction, the demand for winter construction is increasing day by day.
How to ensure that concrete performance meets standards and ensure engineering safety in low-temperature environments has become a key issue that urgently needs to be solved in the field of civil engineering.
Therefore, in-depth exploration of the innovative application of insulation and curing technology for winter concrete construction is of great significance for the technological progress of the industry.
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(1) Most cities now prohibit on-site mixing.
Gradually extending to county towns and rural areas.
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At present, China’s cement production accounts for about 50% of the world’s total output, and has maintained the world’s top position for 21 consecutive years.
Based on the advantages of domestic cement resources, cement concrete pavement is widely used and has played a huge role in the national economic construction and sustainable development.
During use, it has also been found that a considerable portion of the road surface has structural defects such as cracking, breakage, subsidence, and misalignment to varying degrees, especially transverse cracks (regular and irregular), which not only pose great difficulties for maintenance and repair, but also seriously affect the functionality and service life of the road surface, becoming a technical difficulty that restricts the development of cement concrete pavement.
This article focuses on the analysis of the hazards, causes, and prevention measures of transverse random cracks in cement concrete pavement based on the actual reconstruction project of the Yueqing Mountain Old Connection Highway, in order to provide benefits for future road construction.
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The construction process of concrete pouring includes: preparation before pouring → material placement during pouring → leveling and vibration → curing after pouring.
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Under the trend of green and sustainable development in the concrete industry, the use of industrial waste and waste tires to prepare rubber crushed concrete has become a research hotspot.
However, the addition of rubber often leads to a decrease in the mechanical strength of concrete, limiting its engineering applications.
A recent study published in Construction and Building Materials successfully solved this pain point by blending various industrial waste aggregates and mineral admixtures.
It not only greatly improved the strength and durability of rubber crushed concrete, but also constructed a machine learning model to achieve accurate prediction of its strength, providing a new idea for the research and application of green concrete.
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Adv.
Colloid Interface Sci.
: Physical adsorption of chloride ions at C-S-H gel interface: mechanism, characterization and its influence on chloride ion transport.