Construction Precast Development
Precast News From China
conpd0523 
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Brick concrete structure: Brick walls bear vertical loads.
Brick concrete structure refers to the use of bricks or blocks to build the walls of vertical load-bearing structures in buildings, and reinforced concrete structures to construct columns, beams, floor slabs, roof panels, and other horizontal load-bearing structures.
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China Construction Western Construction Hainan Region (hereinafter referred to as “China Construction Western Construction”) is a regional subsidiary of China Construction Western Construction Co.
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(stock code: 002302, the largest listed company in China’s ready mixed concrete industry) in Hainan, and is affiliated with China Construction Western Construction Group Fifth (Guangdong) Co.
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Since entering Hainan in 2009, China Construction Western Construction has been deeply cultivating Qiong Island for 17 years, with a focus on Haikou and Sanya, covering cities and counties such as Yangpu, Dongfang, Qionghai, and Qiongzhong.
It has multiple production bases including Meilan Factory, Shengxin Factory, Xiuying Factory, Yangpu Factory, Wenchang Factory, Tianya Factory, and multiple cooperative production and operation units.
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The previous two articles shared the issues of shrinkage cracks and temperature cracks in the production of aerated concrete.
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The steel-concrete composite structure combines the advantages of steel tensile strength and concrete compressive strength, and is widely used in high-rise buildings and bridge engineering.
The global annual production of construction solid waste is enormous, and resource utilization is the key to achieving sustainable development.
Replacing some of the aggregates in the core concrete of steel tube concrete with building solid waste concrete blocks is a new way to achieve high-value utilization of solid waste.
However, the influence of different replacement rates of solid waste concrete blocks and combinations of steel pipe diameter to thickness ratios on the axial compression performance of components is not yet clear, and the applicability of design specifications also needs to be verified.
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Building energy consumption is one of the main sources of global energy consumption, and improving building energy efficiency is crucial for achieving sustainable development.
Phase change materials (PCM) can effectively regulate indoor temperature and reduce energy consumption in buildings by absorbing and releasing latent heat during the phase change process.
However, there is a risk of leakage when traditional PCM is directly added to concrete, and shape stabilization needs to be achieved through supporting materials.
Silica fume (SF) and rice husk ash (RHA), as industrial/agricultural wastes, can both stabilize PCM and serve as auxiliary cementing materials, but their effects on PCM stability and thermal performance in foam concrete are still unclear.
In this study, a shape stabilized PCM insulation board based on foam concrete was developed, and its mechanical properties and thermal performance were systematically tested.
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UHPC is known for its ultra-high compressive strength (usually exceeding 120 MPa), high toughness, and excellent durability, and is suitable for foundation column structures, beams, bridges, seismic and blast resistant engineering, and marine environments.
Compared to ordinary concrete, the amount of UHPC cementitious material used is 800 to 1100 kg/m ³, which is about 3 to 4 times that of ordinary concrete, resulting in a higher carbon footprint.
The main technological paths to achieve low-carbon UHPC include: mix design optimization (experimental optimization, statistical factor design, dense packing method), waste substitution (high silicon waste replacing cementitious materials, recycled aggregates replacing natural aggregates, waste fibers replacing steel fibers), and geopolymer cementless UHPC.
However, the definition of low-carbon is still unclear, and there is a lack of quantitative comparison between carbon emissions and energy consumption.
Some studies overlook the minimum strength requirement of UHPC at 120 MPa.
This review aims to systematically identify the most promising low-carbon UHPC technology paths by establishing a detailed inventory database.
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Code for Acceptance of Construction Quality of Concrete Structures GB 50204-2015.
The water retaining and slurry improving agent product is a new type of concrete admixture independently developed and produced by our company.
This product belongs to a micro crosslinked ternary polymerization system, which wraps and adsorbs water molecules through crosslinked grids.
Under external shear, water molecules are released again, achieving the effect of water retention and slurry extraction.
This product has no rusting effect on steel bars and can be widely used in various types of concrete pumping construction such as construction, roads, bridges, hydraulic engineering, and underground engineering.
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Concrete rough surface is an appearance defect characterized by dense and small pits, rough surface, and lack of mortar on the surface of the structure.
There are no exposed stones or steel bars, and the diameter of the pits is often less than 5mm, with only the surface mortar missing.
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We have conducted some research and summary on the technology of commercial concrete through our study of commercial concrete and years of practice in the concrete profession.
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