precast-tech

Figure 1 shows the scatter plot of the relationship between gas content and water reduction rate for 46 samples.

From the graph, it can be seen that the water reduction rate of the water reducer is roughly positively correlated with the air content, that is, as the air content increases, the water reduction rate of the water reducer will also increase.

Not only that, introducing air into concrete can also increase the cohesion of concrete and the lubrication effect between materials, improve the segregation and bleeding of concrete, and enhance the workability of fresh concrete [1].

Edge Lift Anchor

Meanwhile, appropriate air entrainment in concrete can also improve its frost resistance, significantly enhancing its impermeability, resistance to chloride ion penetration, and carbonation resistance [2].

But if the air content is too high, it can also lead to too many holes in the concrete, making it less dense and reducing its strength.

Therefore, the current standard GB8076-2008 “Concrete Admixtures” [3] stipulates that the upper limit of the air content of high-performance water reducing agents is 6%.

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The ground has cracked again! “- This is probably one of the most headache inducing issues for countless homeowners, construction workers, and flooring professionals.

Those irregular turtle cracks not only affect aesthetics, but also pose hidden safety hazards.

At this moment, a classic “throwing the pot” battle will unfold: the material supplier says it’s because the construction was not done well, and the construction party says it’s because the material quality is not good.

Lifting Socket

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During construction, the retention of concrete test blocks is divided into standard curing test blocks and test blocks under the same conditions.

Rebar Wheel Spacers

The reason why the testing of concrete test blocks requires both standard curing and the same conditions is that the two represent different meanings and play different roles, and cannot be simply or mutually denied.

Both must be qualified.

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The phenomenon of concrete hard shell refers to the rapid solidification of the surface to form a “hard shell” after pouring, while the interior is still in a plastic state.

Ferrule Loop Insert

Subsequently, problems such as sanding, cracking, and insufficient strength are prone to occur.

The core cause can be summarized as surface moisture imbalance+uneven hydration reaction.

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During the construction process, the deviation of the reinforcement protection layer of reinforced concrete structural components directly affects the mechanical properties and durability of the reinforced concrete components, which is related to the safety and service life of the building.

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Article 8.

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10 of the Construction Code for Concrete Structures GB50666-2011.

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Printing shell: Use a desktop concrete 3D printer to print hollow permanent templates in sections.

Double Ended Ferrule

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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.

Fixing Socket

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.

Ferrule Loop Insert

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.

Metal Rebar Caps

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