JC/T 986-2018 in English
VALIDCementitious grout
- Issued on:2018-04-30
- Implemented on:2018-09-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$233.00
本标准规定了水泥基灌浆材料的术语和定义、分类与标记、一般要求、技术要求、试验方法、检验规则及保证、标识、产品说明书、合格证、运输与贮存。
本标准适用于设备基础二次灌浆、柱脚底板、地脚螺栓锚固、混凝土结构加固、修补、钢筋套筒连接等使用的水泥基灌浆材料。
Introduction
Core changes in the standard revision
| Comparison dimensions | 2005 edition | 2018 edition | Technical significance |
|---|---|---|---|
| Scope of application | General grouting | New special materials for steel bar connection sleeves | Adapt to the development needs of prefabricated buildings |
| Classification system | Unclassified | 4 fluidity categories + 4 strength grades | Achieve accurate selection |
| Particle size requirements | Uniform 4.75mm sieve residue | Class IV is relaxed to 25mm | Meet the needs of large aggregate grouting |
Analysis of key technical indicators
1. Fluidity classification system
| Class | Initial value | 30min retention value | Applicable scenarios |
|---|---|---|---|
| Class I | ≥340mm | ≥310mm | Precision equipment foundation grouting |
| Class IV | ≥650mm* | ≥550mm | Large volume structure repair |
*Indicates slump expansion test value
2. Compressive strength development curve
Take A85 grade material as an example: 1d strength ≥35MPa reflects the early strength characteristics, 28d strength ≥85MPa meets the high strength requirements, and the 3h vertical expansion rate is relaxed to 0.02%-3.5% to adapt to rapid construction.
Engineering application suggestions
- Selection and matching principles: Class I + A60 combination is preferred for anchor bolts, and Class II + A70 is recommended for concrete structure reinforcement
- Construction control points: Class IV materials must use a forced mixer, and the mixing time is strictly controlled according to the manufacturer's requirements
- Quality acceptance key: The difference between the vertical expansion rate of 24h and 3h (0.02%-0.50%) is the core indicator for preventing shrinkage cracking
Analysis of the impact of standard implementation
After the implementation of the new standard, rebar connection sleeve grouting material needs to pass the steel corrosion test in Appendix A/B, which puts higher requirements on the preservative formula. Beijing New Vision and other participating units have developed special composite expansion agents to solve the problem of controlling the 3h expansion rate of A85 grade materials.
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