1. Reasons for Amendment

The Amendment prescribes quality control procedures for reinforcing bars and other steel materials, reflects amendments to construction standards and Korean Industrial Standards, expands the scope of duties of construction supervisors (construction project management engineers, etc.) to require them to check quality inspection results, and otherwise address a number of weaknesses that have emerged from the operation of the current system.

2. Major Provisions

A. Newly insert the retention of records concerning on-site quality control tests/inspections of reinforcing bars and other steel materials, documents on the approval of materials suppliers, etc.

- Add “Hot Rolled Structural Beams” under C. Steel Structures and “H-Beam Piles” under D. Temporary Equipment and Materials of the Construction Quality Test Standards (attached Table 2)

- Prepare a materials checklist that includes confirmation of the KS certification or non-KS certification of reinforcing bars, H-beams, steel plates, steel wires, etc. (attached Form 15 newly inserted)

B. Incorporate the test specifications for fresh and hardened concrete as per the standard specifications for concrete (KCS 14 20 10)

- Testing frequency for fresh concrete (temperature, slump, air content, chloride content)

: Every 150㎥ → Every 120㎥

- Testing frequency for fresh concrete (unit quantity)

: As necessary → Once a day, once every 120m3, or every time the mix is changed

- Testing frequency for hardened concrete (compressive strength)

: KS F 4009 for ready mix concrete and KCS 14 20 10 for non-ready mix concrete → Once a day, once every 120㎥ depending on the importance of the structure and the size of the construction work, or every time the mix is changed

C. Specify the frequency of static/dynamic load tests to check the bearing capacity of the foundations of construction and civil engineering works, bridges, etc., and add bidirectional load test items (attached Table 2)

- Frequency of static and dynamic load tests

: As necessary → Not less than 1% of all piles for deep foundations (at least one if there are fewer than 100 piles), etc.

- Bidirectional load test: Add the test method (KSF 7003), test frequency (construction specifications), etc.

D. Apply the amended KSF 4419 to the test frequency of interlocking concrete blocks for sidewalks and roads (attached Table 2)

: Apply new test frequencies for appearance and size (general), flexural strength of porous blocks, porosity factor, and thickness of colored layers

E. Add provisions requiring a construction supervisor or construction project management engineer to check the quality inspection register and confirm whether the test certificates have been entered into CALS by the construction engineering service provider, construction business operator, or registered housing constructor (Article 5)

F. Modify provisions in relation to inspections of ready-mix concrete plants so that identification marks on cement and admixture storage facilities and the on-site mixing method of the operator’s cabin are examined according to actual circumstances

- Change type-based and manufacturer-based inspections of storage facilities into type-based inspections, and modify provisions to require confirmation of changes to the size or surface water of aggregates in the on-site mixture

G. Amend provisions to require routine inspections of ready-mix concrete and asphalt concrete materials suppliers to be conducted by the client and construction supervisor together (Article 34)

H. Apply amendments to terms (construction technology service provider → construction engineering service provider) in the “Construction Technology Promotion Act” (rephrase provisions)

I. Clearly specify the scope of persons required to obtain approvals of materials suppliers and report to the contracting authorities (Article 32)

J. Define a client in these Guidelines as a construction site project implementer (main contractor; Article 2), and rephrase other provisions

- Clarify the definition of “client” in these Guidelines to reduce confusion and address cases where persons who request orders for government-furnished materials are specified as clients, and modify a number of words that do not follow Korean grammar

- Delete duplicate items in the standards for unit quantities used to calculate quality testing costs, and apply the omissions (attached Table 4)