Concrete quality appraisal

Concrete is a composite material made of cement, water, sand (fine aggregate) and gravel (coarse aggregate) mixed in a certain proportion. It binds sand and gravel together through the hardening action of cement to form a structural material with high strength and durability.

Concrete has a wide range of uses and is an indispensable material in modern construction and civil engineering. It is widely used in the construction of house construction, bridges, roads, tunnels, dams, ports and other infrastructure. Concrete's high strength and good durability make it ideal for load-bearing and protective structures. In addition, concrete also has good plasticity and can be made into various shapes and sizes according to design needs to meet different engineering and aesthetic requirements.  

Zhongke Testing provides concrete quality appraisal services.

JC/T 1062-2022 Foam concrete block;
JC/T 2558-2020 Permeable concrete;
GB/T 16925-1997 Physical properties of concrete: Wear resistance test of concrete and its products (ball bearings);
GB/T 19496-2004 Drill core detection centrifugal high-strength concrete compressive strength test;
GB/T 50080-2002 Test method for performance of ordinary concrete mixture;
GB/T 50081-2002 Standard for test method for mechanical properties of ordinary concrete;
GB/T 50082-2009 Test for long-term performance and durability of ordinary concrete;
GB 50204-2015 Specification for acceptance of construction quality of concrete structure engineering;
GB 50209-2010 Construction quality acceptance specification for building ground engineering;
GB 50100-2010 Concrete structure design specification;
0GB 50107-2010 Concrete strength inspection and evaluation standard;
1GB/T 50080-2016 Concrete ordinary concrete mixture performance test method;
2GB/T 50081-2002 Standard for testing methods of mechanical properties of ordinary concrete;
3JGJ55-2011 Regulations for design of ordinary concrete mix proportions;
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The court entrusted our company to analyze whether the strength grade of the "concrete" involved in the case reaches C30. If the strength grade of the "concrete" involved in the case cannot reach C30, the reasons will be analyzed. After the appraisal expert group compared and sorted out the test results, the following results of the concrete quality appraisal analysis were obtained:
1. Among the “concrete” samples involved in the case extracted on site, the compressive strength did not meet the requirements of the C30 concrete strength grade;
2. The compressive strength of the "concrete" sample involved in the case does not meet the requirements of the C30 concrete strength grade. It should be due to the unreasonable concrete mix ratio and insufficient bonding force of the cementitious material. The main factors include low cementitious material dosage, excessive water consumption or insufficient cement strength. The possibility of improper construction techniques such as vibration and curing is small.