precast-tech

People have adopted many different methods and developed several theories as the basis for concrete mix design.

I only need to mention a small part of it to awaken your memory.

Crown Foot Anchor

Our current habit is (unfortunately, almost everyone does) to design concrete mix proportions based on experience, such as using a 1:2:4 mixture without considering the special types of raw materials and the amount of mixing water used, and with little or no consideration for the strength of the concrete being manufactured.

Undoubtedly, this method is very crude and primitive, and thoughtful engineers would not adopt it.

.

With the continuous advancement of urbanization and industrialization in China, the demand for concrete as the main material for infrastructure construction is increasing day by day.

Rebar Wheel Spacers

However, factors such as uneven regional development, differences in ideas, lagging standards, and vague responsibility definitions have led to frequent incidents of engineering quality accidents and related disputes.

In order to improve the quality and safety level of engineering, ensure the safety of people’s lives and property, and promote the sustainable and healthy development of national engineering construction, the General Office of the Ministry of Housing and Urban Rural Development issued the “Notice on Key Rectification of Quality Problems in Urban Residential Engineering” in 2025.

Engineering quality not only affects industrial production efficiency and the safety of people’s lives and property, but also relates to social stability.

.

Aggregate is a granular material that plays a filling and skeleton role in a mixture, including crushed stone, gravel, machine-made sand, stone chips, sand, etc.

PVC Chamfer

Coarse aggregate refers to crushed stones, broken stones, screened stones, and slag with a particle size greater than 2.

36mm in asphalt mixtures; In cement concrete, coarse aggregate refers to crushed stones, gravel, and broken gravel with a particle size greater than 4.

75mm.

.

（1） The construction unit has not designated a pre mixed concrete production enterprise or directly purchased pre mixed concrete.

Edge Lift Anchor

.

（2） The establishment of pre mixed concrete production enterprises and sub stations meets the requirements of qualification management regulations.

Precast Round Ferrule

.

According to the requirements of GB 55030-2022 “General Code for Waterproofing of Building and Municipal Engineering”, the crack resistance measures for the roof fine aggregate concrete leveling layer/surface layer can be prevented and controlled from three aspects: material optimization, structural reinforcement, and construction measures.

Metal Rebar Caps

.

The free water in the mixture affects the slump of concrete.

Cement hydration and water evaporation will consume free water, reduce water content, decrease the distance between particles inside the slurry, increase viscosity, and decrease the slump of concrete.

Lifting Anchor

.

Abstract: Based on detailed industry observations and literature research, this article systematically analyzes the underlying reasons for the widespread deterioration of the quality of commercial concrete in China.

Research has shown that quality deterioration is not a single technical issue, but the result of the combined effects of material variation, market disorder, lack of technological ethics, and regulatory lag.

Specifically, it manifests as variations in the performance of cement cementitious materials (low proportion of clinker, complex filling materials), degradation of aggregate system quality (replacement of river sand with machine-made sand, high impurity content in stones), and malicious competition among formulations under the market rule of “winning the bid at the lowest price”.

These factors work together to severely overdraw the durability of concrete, laying long-term structural safety hazards.

Shuttering Magnet

Finally, this article proposes comprehensive governance measures and suggestions from the dimensions of standard revision, market supervision, technology guidance, and industry self-discipline.

.

Concrete is not just ‘poured’, but ‘cultivated’.

The quality of maintenance directly determines the future strength, durability, and safety of concrete structures.

This article will use the most straightforward language to explain the door to concrete curing.

Rebar Bolsters

.

Abstract: The curing of concrete is a key link in ensuring its mechanical properties, durability, and structural safety.

This article systematically analyzes the effects of curing start time and duration on cement hydration process, strength development, and microstructure based on the standard curing time of different functional concrete.

Based on the principles of materials science, this paper explores the regulatory mechanisms of environmental factors (temperature and humidity) and material factors (cement variety, additives) on the maintenance system.

Dog Bone Anchor

Research has shown that following a scientific schedule for curing can effectively suppress plastic shrinkage and drying shrinkage cracks, improve the compactness and long-term durability of concrete.

This article aims to provide theoretical basis and optimization suggestions for engineering practice, and looks forward to the development direction of intelligent maintenance technology in the future.

.