A.0.1 The cement used in preparing mortar must meet the requirements of corresponding quality standards. The strength grade of cement used in cement mortar should not be greater than 32.5MPa. The strength grade of cement used in cement mixed mortar should not be greater than 42.5MPa. The use of waste cement is strictly prohibited.
A.0.2 The sand used to prepare mortar should be clean medium sand, which should be screened and should not contain grass roots, waste residue and other impurities. The mud content of the sand used for masonry mortar should not exceed 5%, the mud content of the sand used for plastering mortar should not exceed 3%, and the mud content of the sand used for waterproof mortar should not exceed 1%. Other indicators of sand should comply with the requirements of the current national standard "Sand for Construction" (GB/T14684). It is strictly prohibited to use sea sand or sand with exceeding Cl-standard to prepare mortar.
A.0.3 The lime paste used to prepare mortar should be made from lumpy quicklime. The lumpy quicklime should comply with the requirements of the current industry standard "Construction Lime and Test Methods" (JC/T478). When pouring, it must be filtered through a screen with a hole diameter of no more than 3mm × 3mm, and it must be fully matured. For masonry mortar, the curing time should not be less than 7 days. For plastering mortar, the curing time should be no less than 15d at room temperature. The lime paste stored in the sedimentation tank should be protected from drying and contamination. It is strictly prohibited to use lime paste containing unripened particles, dehydration and hardening or other impurities.
A.0.4 Use ground lime powder to prepare mortar. The ground lime powder should comply with the requirements of the current industry standard "Construction Quick Lime Powder" JC/T480. The ground lime powder should be matured first, and the aging time should not be less than 3 days.
A.0.5 The quality standard of fly ash used to prepare mortar should comply with the requirements of the current national standard "Fly Ash for Cement and Concrete" GB1596.
A.0.6 The waterproofing agent used in mortar should comply with the requirements of the current industry standard "Mortar Concrete Waterproofing Agent" JC474.
A.0.7 Organic plasticizers such as microfoam agents and other additives mixed into the mortar should meet the requirements of relevant standards and can only be used after passing the mortar performance test.
A.0.8 The water used for preparing mortar should be clean water that does not contain harmful substances, and the water quality should meet the requirements of the current industry standard "Water Standard for Concrete Mixing" JGJ63.
A.0.9 The mix ratio of mortar should be determined according to the performance requirements of this specification and in accordance with the current industry standard "Design Regulation for Mixture Proportion of Masonry Mortar" JGJ98. The tested performance indicators of the mortar comply with Articles 4.3 and 4.4 of this specification. After meeting the requirements of this section, it can be used as the mortar mix ratio for construction.
A.0.10 The amount of each component material of the mortar. The measurement error of cement, water and admixtures by mass should not be greater than 2%. The measurement error of sand, lime paste, fly ash and other admixtures should not be greater than 2%. 5%.
A.0.11 Mechanical mixing should be used. The mixing time of cement mortar and cement mixed mortar should not be less than 2 minutes, and the mixing time of cement fly ash mortar and mortar mixed with admixture should not be less than 3 minutes.
Appendix B Technical requirements for autoclaved aerated concrete blocks
Table B.0.1 Common specifications and dimensions of autoclaved aerated concrete blocks
Nominal block size (㎜) | Block production size (㎜) | ||||
Length L | WidthB | Height H | Length L1 | Width B1 | Height H1 |
600 | 100 150 200 250 |
200
250 300
| L—10 | B | H—10 |
120 180 240 | |||||
Note: Production dimensions and specifications not listed in the table can be determined by the user through negotiation with the manufacturer . | |||||
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