SYNOPSIS

This technical talk provides an in-depth overview of the concrete-related requirements outlined in the JKR Standard Specifications for Building Works 2020. The session focuses on essential materials and practical aspects of concrete design and site practices to ensure quality and durability in construction.

Key areas covered include:

• Cementitious Materials: Types permitted by JKR, such as CEM I, GGBS, PFA, and silica fume,
   their functions, and compatibility in various concrete applications.
• Aggregates: Requirements under JKR specifications, types of aggregates, relevant standards
   (MS 30 & EN 12620), and quality considerations.
• Admixtures and Water: Overview of commonly used admixtures (superplasticisers, retarders,
  etc.) and water quality standards based on EN 1008.
• Concrete Specification: Guidance on choosing between designed, prescribed, and proprietary
   concrete; importance of strength class, workability, maximum W/C ratio, and durability criteria
   under exposure conditions.
• Do's and Don'ts in Concrete: Practical advice on placement, compaction, curing, and common
   site issues, with emphasis on quality control and avoiding workmanship errors.

The session concludes with a Q&A to address participants’ queries and provide clarifications related to concrete works in accordance with JKR standards.


BIODATA OF SPEAKER

Dr. Yeo Shih Horng is a distinguished expert in high-performance concrete and forensic analysis, with a strong track record in innovative concrete mix design and troubleshooting. As the founder of YSH Concrete Technology Sdn. Bhd., he has contributed significantly to the development of specialized concrete solutions for complex construction projects. His expertise spans a variety of applications, including fast-track construction in harsh environments. Notably, he played a pivotal role in designing a concrete mix for a FAB project in Dalian, China, where the mix achieved over 25 MPa within 24 hours despite freezing temperatures without conventional heat curing. His involvement in the Changi Airport expansion project demonstrates his ability to consult on large-scale projects, advising on mix design, site quality control, and troubleshooting. Dr. Yeo has successfully developed high-performance concrete mixes tailored to specific needs, including low-heat, high-strength C60/75 concrete for data centers in Singapore and ultra-high early strength concrete capable of reaching 20 MPa within just 8 hours for specialized repair applications. Beyond mix design, he is deeply involved in concrete forensics, investigating structural integrity issues, cracking in concrete sleepers, delayed ettringite formation, tunnel lining defects, and other critical problems in construction. His forensic expertise has helped resolve complex concrete failures across various industries. Dr. Yeo’s contributions extend to professional associations, having served as a committee member for the American Concrete Institute (ACI) – Malaysia Chapter and The Institution of Engineers, Malaysia (IEM). His dedication to advancing concrete technology continues to impact the industry, shaping innovative solutions for construction challenges worldwide