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.

Concrete Paving Blocks (Concrete Pavers)
Appearance quality
Dimensional tolerance (allowable deviation)
Strength (compressive strength / splitting tensile strength / flexural strength)
Abrasion resistance (wear resistance)
Freeze-thaw resistance
Water absorption
Slip resistance (anti-slip performance)
Freeze-thaw resistance (duplicate entry removed, retained once as per standard practice)
Salt scaling resistance (de-icer salt frost resistance / resistance to freeze-thaw with de-icing salt)
Concrete Paving Blocks: GB/T 28635
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