China Testing & Certification International Group Co., Ltd. (CTC, Stock Code 603060) originated from the testing and certification business of China Building Materials Academy in the 1950s. After 70 years of unremitting efforts and persistent pursuit, the company has formed five business categories: detection and testing, certification and evaluation, testing instruments and intelligent manufacturing, measurement and calibration, scientific research and technical services, committed to providing customers with technical services and comprehensive solutions of detection and testing, certification and evaluation, appraisal, consultation, training, and instruments and equipment in fields of quality, environmental protection, green, safety, health, and energy conservation.

Aggregates form the skeleton of concrete and mortar, occupying approximately 70% of their volume. Their quality directly determines the strength, durability, volume stability, and ultimately the safety and service life of the entire engineering project. With the increasing scarcity of natural sand and gravel resources and stricter environmental policies, alternative materials such as manufactured sand (mechanism sand) and recycled aggregates are becoming more widely used. This poses new and more complex challenges for the quality control of aggregates.
Sand (Fine Aggregate)
Stone (Coarse Aggregate)
Apparent Density
Loose Bulk Density
Compacted Bulk Density
Void Ratio (Voids Content)
Clay, Silt and Dust Content
Clay Lump Content
Lightweight Material Content
Shell Content
Chloride Content
Soundness
Organic Matter Content
Alkali-Aggregate Reactivity (AAR)
Sulfide and Sulfate Content
Mica Content
Sieve Analysis (Particle Size Distribution/Grading)
Rock Compressive Strength
Crushing Value (Aggregate Crushing Value)
Flat and Elongated Particle Content
Stone Powder Content (Fine Content)
Water Absorption
Sand (Fine Aggregate) – Natural sand, manufactured sand: GB/T 14684-2022
Stone (Coarse Aggregate) – Crushed stone, iron ore stone: GB/T 14685-2022
1. Comprehensive testing parameters, with experience in nuclear power project testing.
2. Extensive knowledge and experience in testing related aggregate products such as sea sand and washed sand.
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