A concrete structure is expected to retain the required levels of its performance during the intended service life. Therefore, in order to keep the performance always above its required level, the effective maintenance should be indispensable. The level of maintenance applied to a concrete structure is closely related to the levels of the design and the construction works of the structure. This means, for example, when maintenance free condition is required for the structure, the sufficient safety margins on the degradation of performance should be provided to the structure at the design and the construction stages. On the other hand, when frequent maintenance action is considered to be carried out, such the margins of performance may be set to be rather small. In other words, performance of a concrete structure can be clearly controlled by maintenance activities according to a service life scenario incorporating the maintenance strategy. This means that the performance based strategy, which is also the basic concept of the JSCE Standard Specifications, should be considered on the structure through its service life including not only the design and construction stages but also the maintenance stage after construction.
The word “maintenance” in the JSCE Standard Specifications is defined as “a set of activities taken to collect information on the performance of a structure, to assess the performance, and to preserve/restore it so as to satisfy required performance during the service life”. The Maintenance part provides guidance to retain the required performance through maintenance and consists of three parts, that are “General Requirements” describing the general rules, including required performance, and the flow of maintenance, “Standard Method” describing the method of maintenance, and “Maintenance for Specific Deterioration Phenomenon and Mechanism” describing the specific maintenance procedures adopted for each deterioration mechanisms.

GENERAL REQUIREMENTS
CHAPTER 1 GENERAL
1.1 Scope
1.2 Principles of Maintenance Definitions
CHAPTER 2 PERFORMANCE REQUIREMENTS
2.1Principle
CHAPTER 3 METHODS FOR MAINTENANCE
3.1Principle
3.2 Maintenance Plans
3.3 Assessments
3.4 Remedial Measures
3.5 Recording

STANDARD METHOD
CHAPTER 1 GENERAL
1.1 Scope
CHAPTER 2 MAINTENANCE PLANS
2.1 Establishment of Maintenance Plans
2.2 Categories of Maintenance
2.3 Control Limit State
CHAPTER 3 INVESTIGATIONS IN ASSESSMENT
3.1 General
3.2 Investigations in Initial Assessment
3.3 Investigations in Routine Assessment
3.4 Investigations in Regular Assessment
3.5 Investigations in Extraordinary Assessment
3.6 Investigations in Emergency Assessment
3.7 Investigation
CHAPTER 4 IDENTIFICATION OF DETERIORATION MECHANISM
4.1 General
4.2 Methods for Identification of Deterioration Mechanisms
CHAPTER 5 PREDICTION
5.1 General
5.2 Prediction of Deterioration Progress Based on Deterioration Mechanism Methods
5.3 Prediction of Deterioration Based on Appearance Grading of Structures
CHAPTER 6 PERFORMANCE EVALUATION AND JUDGMENT
6.1 General
6.2 Performance Evaluation
6.3 Judgment of Necessity for Remedial Measures
CHAPTER 7 REMEDIAL MEASURES
7.1 General
7.2 Types and Selection of Remedial Measures
7.3 Repair and Strengthening
CHAPTER 8 RECORDING
8.1 Principle
8.2 Method of Recording
8.3 Items to be Recorded
8.4 Storage of Records
CHAPTER 9 MEASURES TO CHANGE OF LEVELS FOR PERFORMANCE REQUIREMENTS
9.1 General
9.2 Planning of Remedial Measures
9.3 Assessment
9.4 Selection and Design of Remedial Measures
9.5 Execution of Remedial Measures
9.6 Maintenance after Remedial Measures
9.7 Recording
CHAPTER 10 PRESTRESSED CONCRETE
10.1 General
10.2 Maintenance Planning
10.3 Investigations in Assessment
10.4 Identification of Deterioration Mechanism and Prediction of Deterioration Progress
10.5 Evaluation and Judgment
10.6 Remedial Measures
10.7 Recording

MAINTENANCE FOR SPECIFIC DETERIORATION PHENOMENON AND MECHANISMS
CHAPTER 1 General
1.1 General
1.2 Maintenance Planning
1.3 Assessment
CHAPTER 2 MEASURES OF WATER
2.1 General
2.2 Assessment
2.3 Remedial Measures
2.4 Recording
CHAPTER 3 CRACKS
3.1 General
3.2 Maintenance Planning
3.3 Assessment
3.4 Remedial Measures
3.5 Recording
CHAPTER 4 CORROSION OF STEEL
4.1 General
4.2 Maintenance Planning
4.3 Assessment
4.4 Remedial Measures
4.5 Recording
CHAPTER 5 CARBONATION
5.1 General
5.2 Maintenance Planning
5.3 Assessment
5.4 Remedial Measures
5.5 Recording
CHAPTER 6 CHLORIDE ATTACK
6.1 General
6.2 Maintenance Planning
6.3 Assessment
6.4 Remedial Measures
6.5 Recording
CHAPTER 7 FROST ATTACK
7.1 General
7.2 Maintenance Planning
7.3 Assessment
7.4 Remedial Measures
7.5 Recording
CHAPTER 8 CHEMICAL ATTACK
8.1 General
8.2 Maintenance Planning
8.3 Assessment
8.4 Remedial Measures
8.5 Recording
CHAPTER 9 ALKALI-SILICA REACTION
9.1 General
9.2 Maintenance Planning
9.3 Assessment
9.4 Remedial Measures
9.5 Recording
CHAPTER 10 FATIGUE
10.1 General
10.2 Maintenance Planning
10.3 Assessment
10.4 Remedial Measures
10.5 Recording
10.6 Fatigue of Beams
CHAPTER 11 ABRASION
11.1 General
11.2 Maintenance Planning
11.3 Assessment
11.4 Remedial Measures
11.5 Recording