precast-tech

precast-tech

When is the appropriate time to remove the formwork for concrete engineering

by

In engineering practice, on the one hand, the compressive strength of test blocks under the same conditions is used as the basis for demoulding, and on the other hand, it is based on the fact that demoulding after concrete setting does not affect the appearance quality of the concrete, such as not sticking to the mold, falling corners, etc.

However, in practical engineering, the sampling and production of test blocks are not standardized, resulting in a widespread phenomenon of arbitrary demoulding, which poses hidden dangers to engineering quality and construction safety.

Metal Rebar Caps

Premature demoulding can cause damage to the appearance of concrete, while severe cases can result in cracks.

In severe cases, it can cause structural collapse and lead to major quality accidents.

.

Several methods for detecting the carbonation depth of concrete strength using rebound method

by

After cement hydration, a large amount of Ca (OH) 2 will be generated.

Except for a small amount dissolved in the pore fluid, which makes the concrete alkaline, most of it exists in a crystalline state and becomes a reserve for the pore fluid to maintain high alkalinity.

CO2 gas in the air continuously passes through the coarse capillary channels in the concrete that are not fully filled with water, and neutralizes the Ca (OH) 2 dissolved in the pore fluid.

Precast Lifting Clutch

The reaction generates CaCO3 and H2O that are insoluble in water.

CaCO3 adheres to the surface pores, increasing the density of the concrete surface and thus improving the strength of the surface concrete.

However, the internal strength does not increase, so the depth of carbonation needs to be measured and corrected.

.

Why are more and more projects abandoning concrete admixtures?

by

The additive industry has undergone decades of development, and in addition to traditional additives such as water reducers, retarders, and early strength additives that can have intuitive effects, they can continue to develop.

However, additives such as expansion agents, rust inhibitors, anti crack fibers, etc.

Concrete Lifting Clutch

have gradually lost credibility.

It is not due to problems with the additive products, but rather due to human factors and market factors that more and more construction sites have doubts about the effectiveness of the additives and have abandoned them.

There are various reasons for this, including counterfeiting and non necessity.

The main reasons are as follows:.

Precast concrete vertical shaft: the hub of underground engineering

by

In the field of municipal and environmental engineering, the efficient construction of underground space cannot be separated from the innovation of key infrastructure.

Erection Anchor

Yatai Building Materials, with the core concept of “Thai Chain Intelligent Manufacturing”, has launched precast concrete shafts to provide environmentally friendly, safe, and efficient solutions for underground spaces and ground communication channels.

.

Pre mixed concrete information price in November 2025

by

According to the Notice on the Revision of the Shaanxi Province Engineering Cost Information Material Information Price Catalog issued by the Shaanxi Provincial Construction Engineering Cost Service Center, starting from February 2025, the information price of ready mixed concrete will be re included in the Shaanxi Engineering Cost Information and published in the form of a special report.

The information price released in this issue is for ordinary concrete, without considering factors such as special requirements for cement, sand and gravel, and other additives in special and key projects; The prices released have experienced significant fluctuations due to changes in the collection channels, calculation methods, etc.

, indicating that the fluctuation in the price of ready mixed concrete information in this period is not caused by market changes.

Metal Rebar Caps

All concrete supply and demand enterprises are requested to be aware of the situation and negotiate and communicate price matters.

.

The Mystery of Microbial Corrosion of Concrete

by

Concrete, in our impression, is incredibly strong, but it may be quietly gnawed on by microorganisms that are invisible to the naked eye.

Coil Loop Insert

This process begins in a sewage environment: at the bottom of the oxygen deficient pipeline, sulfate reducing bacteria convert sulfides into hydrogen sulfide gas with a foul egg odor.

When these gases enter the aerobic space at the top of the pipeline, sulfur oxidizing bacteria begin to work, oxidizing hydrogen sulfide into highly corrosive bio sulfuric acid.

.

Make good materials | Two special types of concrete double breakthroughs to help with the final sprint!

by

Since entering the fourth quarter, the company has been striving to be the first, and each station has achieved breakthroughs in the field of special concrete applications.

Metal Rebar Caps

Recently, the C30 steel fiber reinforced concrete at Hanxin Station was successfully pumped over long distances; The self compacting concrete technology for stone stacking at Hengkun Station has been successfully implemented in major water conservancy projects, and both achievements have won the trust of customers with excellent performance, injecting strong power into the construction of core projects and laying a solid technical foundation for the company to strive for annual goals and tasks.

.