conpd0523

Let me talk to you about the “industrial MSG” of concrete – concrete admixtures, its magnificent three lives and three generations.

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In the sleepless night, looking out at the high-rise building under construction outside the window, I remembered my more than ten years of struggling in the concrete and admixture industry.

Lifting Socket

From a naive youth who didn’t even know what “water reduction rate” was at first, to an old trick of “prescribing remedies” for construction sites now, I have witnessed too many changes.

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Complete analysis of concrete slump loss: seven major culprits and reduction measures

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The matching of cement and pumping agent must be determined through adaptability testing to determine the optimal dosage.

Concrete Plate Anchors

The more air entraining and retarding components there are, the slower the slump “falls out”; Conversely, the faster.

Naphthalene based high-efficiency water reducing agents perform well below+5 ℃, but once heated up, the loss rate immediately doubles.

If the setting agent of hard gypsum or the early strength component C3A in cement exceeds the standard, it will cause the slump to change instantly.

The content of C3A should be locked in the range of 4% to 6%: if it is lower than 4%, it is necessary to reduce air entrainment and slow down condensation; If it exceeds 7%, it must be supplemented, otherwise false coagulation and rapid coagulation may occur at any time.

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Principle and usage method of concrete surface reinforcement agent

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In order to save costs, modern concrete is mixed with a large amount of admixtures (fly ash or mineral powder), or there is no fly ash or mineral powder but too much admixture in cement.

After vibration, the surface of the concrete is prone to slurry floating, excessive surface floating slurry, water evaporation leaving holes, and excess water causing local water cement ratio to be too high, resulting in low surface strength of the concrete.

In addition, the surface strength of concrete cannot increase even at low temperatures.

Coil Loop Insert

The mixing plant uses C30 concrete, which has a rebound of 3-5 megapascals lower, and even lower.

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Flexible concrete puts seismic armor on houses

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On April 14th, the reporter visited the Anhui Provincial Key Laboratory of Building Seismic Disaster Reduction and Green Operation and Maintenance, and observed a unique “hardcore” competition on site – the comparative test of high ductility concrete (HDC) reinforced rural house vibration table.

The experimental results showed that in the face of severe shaking from a nine degree earthquake, the unreinforced model collapsed instantly, while the houses reinforced with HDC strips only showed minor cracks, and the main structure remained strong.

Plastic Nail Plate

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Do you still not understand the concrete structure drawings? Reading construction drawings with flat methods is a must-have for new

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Hello everyone, engineering colleagues! Many newcomers and novices who have just entered the construction site feel like they are reading a “heavenly book” from an alien world when faced with the unfolded concrete structure construction drawings? The densely packed lines, symbols, codes, and plain markings are like a string of mysterious codes.

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Fixing Socket

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are they unreadable and difficult to read?.

Supplement a detailed drawing of reinforced concrete beam with enlarged cross-section

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The shortcomings of this approach: the welding points of the beam stirrups should be set at the top or bottom, and should avoid bending by no less than 100mm.

If the stirrups are bent in advance, they cannot penetrate the original structural floor slab; If the hoop reinforcement penetrates the floor slab and bends on site first, it is difficult to operate in practice and the bending quality cannot be guaranteed.

Halfen Channel

Therefore, placing the hoop reinforcement welding points on the side of the beam is actually a location with greater stress.

In addition, when using lap welding, the diameter of the hoop reinforcement should not be less than 10mm.

This practice is for reference only.

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Which is the reliable concrete fire water pool with outstanding reputation in Xi’an

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In Xi’an, fire safety is crucial, and as a key facility to ensure fire safety, the quality and reliability of concrete fire water tanks directly affect people’s life and property safety.

So, which concrete fire water pool with outstanding reputation in Xi’an is reliable? Next, let’s delve deeper together.

Cast in Loop

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