Construction Precast Development
Precast News From China
Recently, at the construction site of the T1 and T2 sections of the Shiqiao Extra Large Bridge on the Nanraocheng East Yanta City to Jinxian Expressway in Nanchang, machinery roared and personnel were busy.
The crane smoothly lifted the precast concrete slab, and the workers accurately aligned, calibrated, and fixed it.
The entire set of movements was completed in one go, and the construction site was full of enthusiasm.
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The era is iterating forward, and the wave of architectural industrialization is sweeping across the globe.
When modern architecture is situated in the hinterland of national cultural heritage, finding a balance between historical preservation and design innovation has become a common proposition in the global architecture industry.
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Recently, at the construction site of the T1 and T2 sections of the Shiqiao Extra Large Bridge on the Nanraocheng East Yanta City to Jinxian Expressway in Nanchang, machinery roared and personnel were busy.
The crane smoothly lifted the precast concrete slab, and the workers accurately aligned, calibrated, and fixed it.
The entire set of movements was completed in one go, and the construction site was full of enthusiasm.
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In response to common industry drawbacks such as unstable maintenance conditions and non-standard maintenance operations during the curing stage of test blocks, the Central Research Institute of Shanghai Construction Engineering Group has independently developed an “intelligent maintenance cabin” to build a complete digital control system for the process chain of sampling, warehousing, transportation, standard curing, and unloading.
Through the core architecture of “human cloud platform machine arm test block” four-dimensional real-time linkage interaction, the full process unmanned operation of concrete test block curing on the construction site has been achieved for the first time, providing an efficient, practical, and replicable intelligent solution for on-site material quality control.
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Concrete vibration not carried out in the prescribed order, improper vibration methods, or local missed vibration can lead to local sand and stone concentration, making the concrete loose and not compact, resulting in honeycomb shaped holes or the formation of local holes, especially in areas with dense steel bars, which are prone to adverse diseases such as honeycomb and exposed reinforcement.
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In the field of architecture, plain concrete is highly favored due to its unique texture and natural beauty.
It does not require additional decoration and presents the artistic quality of the building directly with the texture of the concrete itself.
This “natural beauty” has attracted many designers and homeowners.
And behind achieving this effect, it cannot be separated from professional manufacturers of plain concrete.
They upgraded concrete from ordinary building materials to artistic carriers through precise formula design, strict production processes, and meticulous construction management.
This article will analyze the core capabilities of fair faced concrete producers from a technical perspective, taking you to understand the scientific code behind this building material.
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The connotation of alkali aggregate reaction (AAR) can be understood from its name, that is, the alkali substances contained in the concrete slurry react chemically with the active substances in the aggregate, and gel will be formed after the reaction, which will then expand, and finally cause the concrete to crack.
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Reading method: click the above “special treatment for difficult and miscellaneous building problems” to enter the official account, and then click the above attention, all the contents of this official account will be displayed.
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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.
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.
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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