JC/T 890-2017 in English
VALIDSpecial mortar for autoclaved aerated concrete wall
- Issued on:2017-04-12
- Implemented on:2017-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$204.00
本标准规定了蒸压加气混凝土墙体专用砂浆的术语和定义、分类与标记、原材料、要求、试验方法、检验规则、包装、贮存和运输、质量证明书等。
本标准适用于蒸压加气混凝土制品（强度等级大于等于A2.5）在墙体工程中应配套使用的专用砂浆；在其它建筑工程中应用时，可参照执行。
本标准不适用于蒸压加气混凝土制品（强度等级小于A2.5）在保温工程中应配套使用的砂浆。
Introduction
Standard Revision Background and Technological Innovation
JC/T 890-2017, replacing the 2001 version, features key improvements: redefining the performance indicators for thin-bed masonry mortar (mortar joints ≤ 5mm), adding new plaster classifications (Type B/Type L), and optimizing the waterproofing grade of interfacial mortar (Type P/Type F). This standard addresses the compatibility issues between traditional mortar and AAC panels, responding to the growing demand for prefabricated buildings.
Comparison of key performance indicators
| Mortar type | Compressive strength (MPa) | Water retention rate (%) | Tensile bond strength (MPa) | Special requirements |
|---|---|---|---|---|
| Thin layer masonry mortar | M5:≥5.0 M10:≥10.0 | ≥99.0 | ≥0.30 | Shrinkage rate≤0.20% |
| Waterproof interface mortar (Type F) | - | ≥99.0 | ≥0.50 | Impermeability pressure≥0.4MPa |
| Lightweight plaster gypsum (L type) | ≥2.5 | ≥75 | ≥0.35 | Volume density≤1000kg/m³ |
Key technologies for engineering application
Key points for thin layer masonry construction
Use special toothed scraper to control the mortar joint thickness ≤5mm, and the moisture content of the base layer should be <15%. A case study shows that after using DMa-M10 mortar in a prefabricated project, the wall cracking rate was reduced by 62%.
Interface Treatment Solution
F-type interface mortar must be used in waterproof areas, with a coating amount of ≥1.5kg/m². Tested data shows that the bond strength of walls treated with F-type mortar increased by over 40%.
Key points of quality control
- Raw material control: Sand moisture content ≤0.5%, cement preferably P·O42.5
- Factory inspection: Water retention and bond strength must be inspected for every 400 tons batch
- Storage management: The shelf life of bagged products is 6 months, and they must be stored in a moisture-proof manner
Suggestions for standard implementation
1. The mortar type marking (e.g., DMa-M10-JC/T890-2017) should be clearly defined during the design phase.
2. A bond strength pull-off test must be conducted before construction (refer to Appendix A).
3. During winter construction, antifreeze must be added to the interface mortar and the curing time must be extended.
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