precast-tech

In large-scale housing construction projects, the pouring of large volume concrete is like the “texture” of a person, and the quality of concrete pouring is related to the “health” of this massive body.

Recently, the Shenyang Project Department of China Railway Sixth Bureau Beijing Company successfully developed and applied a new comprehensive technology solution that integrates “material innovation+intelligent temperature control+fine construction”, effectively overcoming traditional problems such as concentrated release of hydration heat and insufficient waterproof performance of large volume concrete, and building a strong construction quality barrier for the high-quality construction of Shenyang Hunnan Science and Technology City.

Coil Loop Insert

.

Concrete is a heterogeneous brittle material formed by mixing sand and gravel aggregates, cement, water, and other external materials.

Due to a series of problems such as concrete construction, deformation, and constraints, there are numerous micro pores, air pockets, and micro cracks in the hardened concrete.

It is precisely because of these initial defects that the concrete exhibits some heterogeneous characteristics.

Swift Lift Clutches

.

With the widespread application of 3D concrete printing (3DPC) technology in the construction field, the lack of steel reinforcement leading to insufficient tensile performance has become a key bottleneck.

For this reason, scholars such as Yan Zitong first proposed a technical solution of using fiber-reinforced polymer (FRP) to constrain 3D printing of ultra-high performance concrete (FC3DPU), and studied its mechanical performance enhancement mechanism through an axial compression test system.

Crown Foot Anchor

.

1.

PVC Chamfer

Code for Acceptance of Construction Quality of Concrete Structures GB20504-2015.

Foam concrete is widely concerned because of its excellent performance of heat insulation, fire prevention, sound absorption and low density.

Conventional foam concrete uses ordinary Portland cement (OPC) as the binder, but the energy consumption of cement production is high.

Each ton of cement emits about 0.

85 tons of CO ₂, accounting for nearly 8% of global anthropogenic CO ₂ emissions.

Geopolymer foam concrete (GFC) combines the lightweight and thermal insulation characteristics of foam concrete and the environmental protection and high-performance characteristics of alkali activated bonding system, and uses industrial by-products such as fly ash (FA) as the main binder to significantly reduce greenhouse gas emissions.

Coil Loop Insert

.

During the structural construction process, the project department often discovers varying degrees of quality problems on the construction site, including slag inclusion in construction joints (floor slabs), exposed steel bars, concrete honeycombs, rough surfaces, missing edges and corners, floor cracks, and uneven door and window openings.

Dog Bone Anchor

.

In reinforced concrete structures, the minimum requirement for the thickness of the steel reinforcement protective layer has always been specified.

However, designers determine the thickness according to design standards, and construction and acceptance determine whether the thickness is qualified by applying the allowable deviation in the acceptance specifications based on the design values.

Edge Lift Anchor

It seems that there is nothing wrong with this.

However, the “General Code for Concrete Structures” (GB 55008-2021) implemented on April 1, 2022, as a requirement that runs through the entire process, clearly states that “the survey, design, construction, acceptance, maintenance, curing, demolition and other construction activities of engineering construction projects must be strictly implemented throughout the entire process.

” The mandatory requirement for the thickness of the steel reinforcement protective layer is:.

Concrete.

For a first-class highway, the pavement structure form and quantity are shown in the table below.

Concrete Plate Anchors

Water stabilized materials and concrete are commercial water stabilized materials and commercial concrete.

The dry climate and large temperature difference between day and night in autumn bring a series of challenges to concrete construction, such as changes in setting time, early plastic shrinkage, and temperature stress.

Metal Rebar Caps

To ensure the physical quality and long-term durability of concrete engineering during this season, it is necessary to implement refined control throughout the entire process of raw materials, production, construction, and maintenance.

.

The strength standard value is a value in the overall distribution of cubic compressive strength, and the percentage of strength below this value does not exceed 5%, which means there is a 95% guarantee rate.

Cast In Plate

The strength of concrete is divided into twelve grades: C7.

5, C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, etc.

.