precast-tech

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The reason for the “powdering and sanding” on the surface of concrete often becomes a focus of controversy between construction units and commercial concrete enterprises: construction units believe that commercial concrete enterprises add mineral admixtures with poor water hardness and low density when producing concrete, which are prone to float to the surface of the concrete during vibration, resulting in a significant decrease in the surface hardness of the concrete and are the main culprits causing “powdering and sanding”; The “powdering and sanding” on the surface of concrete in commercial concrete enterprises is mainly caused by excessive vibration during the construction process, resulting in concrete bleeding.

The water cement ratio on the surface of the concrete is too high, the surface water strength is low, and the wear resistance is poor.

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It is not related to the concrete material itself or whether it is mixed with fly ash, or improper curing of the concrete, resulting in rapid water loss and insufficient hydration of the surface cement.

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The specific surface area of sand particles is larger than that of coarse aggregates.

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As the sand ratio increases, the number of fine particles increases, the specific surface area increases, and the amount of water adsorbed on the surface of the aggregate increases, playing a good role in water retention.

In addition, an increase in sand ratio leads to an increase in the sand content in the mortar.

With a constant water consumption, the consistency of the mortar increases and its water retention performance improves.

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The performance of concrete is closely related to environmental temperature, and sudden cooling, as a typical extreme temperature change condition, can have a negative impact on the workability, strength, and durability of concrete by changing the hydration of cement and causing volumetric stress imbalance.

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With the continuous development of materials science, the application field of concrete is becoming more and more extensive.

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Regardless of which field of concrete it is used in, the key to its mix design is to target the workability, mechanical properties, and durability of concrete, select suitable raw materials, optimize mix parameters, and achieve the design requirements.

Starting from the inherent requirements of mix proportion design, this article explores the direction of mix proportion adjustment under the influence of different factors, which has practical guiding significance for the design and production of concrete.

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In the evolution of the construction industry, precast concrete components, as a revolutionary building technology, are gradually changing traditional building models.

It not only improves building quality and construction efficiency, but also provides strong support for achieving building industrialization and sustainable development.

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[Introduction] Two different density grades of aggregates are used to prepare concrete with a density grade of 4300kg/m3.

It is advisable to use a volumetric sand ratio and design the mix proportion according to the volumetric method.

The calculated mix proportion has a good correlation with the actual mix proportion.

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High performance concrete is a type of concrete that significantly improves various performance indicators on the basis of ordinary concrete.

It is made using modern concrete technology such as low water cement ratio, high water reducing polycarboxylate superplasticizer, and large amount of ultra-fine mineral admixture.

Its main technical indicators are excellent durability, high compressive strength, good impermeability, corrosion resistance, frost resistance, and inhibition of concrete alkali aggregate reaction.

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Its concrete mixture has excellent workability (and ease of use), strong applicability, and is also an economical and environmentally friendly concrete.

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The daily work of concrete technicians cannot be separated from communication, just like communication between departments, reporting work to leaders, conducting technical briefings with the construction site, and negotiating control of the construction process.

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These tasks require laboratory technicians to have good communication and expression skills.

Good communication skills can sometimes achieve twice the result with half the effort, but improper communication can also be detrimental to work and even affect collaboration between departments and external parties.

Improving communication and coordination skills should be a part of the abilities that concrete technicians need to enhance.

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