Construction Precast Development
Precast News From China
precast technology developments
The complete solidification time of concrete usually depends on various factors, such as the mix proportion, temperature, humidity, etc.
Generally speaking, concrete will initially harden within 24 hours and reach strong strength after 72 hours, but it usually takes 28 days to fully solidify and reach the design strength.
This is because the hydration reaction of cement requires a certain amount of time to fully proceed, and as time goes on, the strength of concrete will gradually increase.
.
On September 24, 2025, the Ministry of Industry and Information Technology and six other departments jointly released the “Work Plan for Stabilizing Growth in the Building Materials Industry”, which sets the industry tone: by 2026, the operating revenue of green building materials will exceed 300 billion yuan.
.
According to data analysis from the National Bureau of Statistics, the main economic indicators of the concrete and cement products industry will continue to decline from January to November 2025.
The main business income of the concrete and cement products industry above a certain scale decreased by 14.
3% compared to the same period last year, a decrease of 0.
3 percentage points from January to October; The total profit decreased by 26.
57% compared to the same period last year, a decrease of 0.
34 percentage points from January to October.
.
Recently, the data of Chengdu’s ready mixed concrete industry in 2025 reflects the industry difficulties in first tier cities across the country.
There are 147 compliant enterprises in the city (24 state-owned enterprises and 123 private enterprises), with a total output of 41.
22 million cubic meters, a year-on-year decrease of 15%.
The capacity utilization rate is only 24%, and most enterprises are operating at half capacity or even temporarily shut down.
The industry concentration is extremely high, with 8 leading enterprises accounting for 49% of the total output, and small and medium-sized enterprises struggling to survive.
.
Concrete mix ratio is almost a core skill that every concrete practitioner must master.
Both enterprise managers and frontline technicians are well aware that the rationality of mix proportions directly affects the quality and construction effectiveness of concrete.
.
In bridge construction, bridge piers serve as key load-bearing structures, and their concrete quality directly affects the safety and durability of the bridge.
In the actual construction process, the phenomenon of honeycomb and cracking on the concrete outside the bridge pier occurs from time to time.
These issues not only affect the appearance of the bridge, but may also weaken the load-bearing capacity of the structure and reduce the service life of the bridge.
It is of great practical significance to conduct a thorough analysis of the causes of honeycomb and cracking in the concrete outside the bridge pier, and to take effective remedial measures.
.
The Yellow River Irrigation Project of Wenbi Electric Irrigation Station in Hequ County is divided into primary and secondary pump stations and water tanks.
The project adopts C30 concrete pouring.
Due to the range of water level changes, the design requires the concrete to use a first grade, with a frost resistance grade of F200 and an impermeability grade of W4.
The maximum particle size of the aggregate is 2/3 of the minimum spacing between the steel bars, not exceeding 25mm.
This time, artificial crushed stone with a particle size of 10-20mm is used.
.
This article focuses on studying the effects of changes in the MB value of machine-made sand on the workability, mechanical properties, shrinkage cracking, and durability of concrete by adjusting the MB value of machine-made sand with added clay, in order to provide reference for the control of MB value of machine-made sand.
.
In the current development of urban construction, super high-rise buildings have gradually become one of the important symbols of urban image, with extremely high requirements for the performance of building materials.
C80 high-performance concrete, as a building material with excellent performance, has been widely used in super high-rise buildings.
This article takes the Guangsheng Wanbo City project as an example to provide a detailed description and optimization analysis of the application of C80 high-performance concrete in super high-rise buildings.
.
Those who study engineering, especially civil engineering related majors, as well as those engaged in civil engineering project design, construction, supervision, and budgeting, inevitably have to deal with the word “tong” frequently.
Speaking of the word ‘concrete’, it’s a bit awkward.
.