在建筑裝飾工程中，抹面砂漿空鼓是常見的質量缺陷，表現為砂漿層與基層之間出現中空層，用硬物輕敲會發出空響。這種問題不僅影響墻面美觀，更可能導致瓷磚脫落、涂料開裂等安全隱患。要徹底解決空鼓問題，需從材料、工藝、養護三個維度展開系統分析。

　　In architectural decoration engineering, hollowing of plastering mortar is a common quality defect, manifested as a hollow layer between the mortar layer and the base layer, which will make a hollow sound when lightly tapped with a hard object. This problem not only affects the appearance of the wall, but may also lead to safety hazards such as tile peeling and paint cracking. To thoroughly solve the problem of hollowing, a systematic analysis needs to be conducted from three dimensions: materials, processes, and maintenance.

　　基層處理是預防空鼓的首要環節。混凝土墻面若殘留脫模劑或油漬，會形成隔離層，導致砂漿無法有效粘結。某工地曾因模板使用機油類脫模劑，造成大面積空鼓，最終需全部鏟除重做。正確做法應采用水性脫模劑，并在抹灰前對基層進行鑿毛處理，使70%以上面積形成凹凸點，或使用甩漿法在墻面形成水泥釘狀結構。對于加氣混凝土砌塊等多孔材料，需噴涂專用界面劑，避免砂漿水分被基層快速吸收。

　　Grassroots treatment is the primary step in preventing hollowing out. If there is residual release agent or oil stains on the concrete wall, it will form an isolation layer, which will prevent the mortar from effectively bonding. A certain construction site once caused extensive hollowing due to the use of oil type release agents in the template, which ultimately required complete removal and rework. The correct approach is to use water-based release agents and chisel the base layer before plastering to form concave and convex points on more than 70% of the area, or use the slurry throwing method to form a cement nail like structure on the wall surface. For porous materials such as aerated concrete blocks, special interface agents need to be sprayed to avoid rapid absorption of mortar moisture by the base layer.

　　材料配比與施工工藝直接決定砂漿性能。某住宅項目因砂子含泥量超標，導致砂漿粘結力下降30%，引發系統性空鼓。規范要求砂子含泥量不得超過5%，且需通過3mm篩網過濾。水泥用量也需精準控制，某辦公樓工程因盲目增加水泥比例，造成砂漿收縮率增大，在窗臺等部位形成環形裂縫。正確做法是根據基材特性選擇砂漿強度等級，如加氣混凝土墻面宜采用M5.0低強度砂漿。

　　The material ratio and construction process directly determine the performance of mortar. A residential project experienced a 30% decrease in mortar bonding strength due to excessive sand and mud content, resulting in systematic hollowing. The specification requires that the mud content of sand should not exceed 5% and it should be filtered through a 3mm sieve. The amount of cement also needs to be precisely controlled. In a certain office building project, blindly increasing the proportion of cement resulted in an increase in mortar shrinkage rate, forming circular cracks in window sills and other areas. The correct approach is to select the strength grade of mortar based on the characteristics of the substrate. For example, M5.0 low strength mortar should be used for aerated concrete walls.

　　施工環節存在三大風險點：一是單次抹灰過厚，規范要求每層厚度控制在7-10mm，但某商業綜合體因趕工期單次抹灰達15mm，導致砂漿自重下垂形成空腔；二是工序間隔不足，前層砂漿未初凝就進行下道工序，造成層間結合不良；三是養護缺失，某醫院項目抹灰后未做保濕處理，在干燥氣候下砂漿失水過快，7日內空鼓率達25%。

　　There are three major risk points in the construction process: firstly, the single plastering is too thick, and the standard requires the thickness of each layer to be controlled within 7-10mm. However, in a commercial complex, due to rushing the construction period, the single plastering reaches 15mm, resulting in the self weight of the mortar sagging and forming cavities; Secondly, there is insufficient interval between processes, and the next process is carried out before the initial setting of the previous layer of mortar, resulting in poor interlayer bonding; Thirdly, there is a lack of maintenance. After plastering, a certain hospital project did not do moisturizing treatment, and the mortar lost water too quickly in dry weather, resulting in a hollowing rate of 25% within 7 days.

　　針對已出現的空鼓，需根據嚴重程度采取差異化修復方案。對于直徑小于10cm的點狀空鼓，可采用注射法處理：在空鼓中心鉆Φ6mm注漿孔，使用低粘度環氧樹脂進行壓力灌漿，待樹脂固化后修補孔洞。某酒店項目采用該技術，24小時即可恢復使用。對于面積超過0.5㎡的片狀空鼓，則需實施局部翻修：沿空鼓邊緣切割出規則矩形，深度至堅實基層，清除松散砂漿后涂刷界面劑，分層修補并掛鋼絲網加強。

　　Differentiated repair plans should be adopted based on the severity of the hollowing that has occurred. For point like hollow drums with a diameter less than 10cm, injection method can be used for treatment: drill a Φ 6mm grouting hole in the center of the hollow drum, use low viscosity epoxy resin for pressure grouting, and repair the hole after the resin solidifies. A certain hotel project adopts this technology, which can be restored to use within 24 hours. For sheet shaped hollows with an area exceeding 0.5 square meters, partial renovation is required: cut regular rectangles along the edge of the hollows, deep to a solid base, remove loose mortar, apply interface agent, repair in layers, and hang steel wire mesh for reinforcement.

　　預防空鼓需建立全過程管控體系。在材料驗收環節，除檢查合格證外，還應進行現場復試，重點檢測砂漿保水率、凝結時間等指標。施工過程中推行"三檢制度"：基層處理后自檢平整度，抹灰前專檢濕潤度，抹灰后互檢空鼓情況。

　　To prevent hollowing, a full process control system needs to be established. In the material acceptance process, in addition to checking the certificate of conformity, on-site retesting should also be conducted, with a focus on testing indicators such as mortar water retention rate and setting time. Implement the "three inspection system" during the construction process: self check the flatness after base treatment, conduct a special inspection of moisture before plastering, and conduct mutual inspection of hollowing after plastering. A certain affordable housing project has reduced the hollowing rate from the industry average of 8% to 1.5% by setting up dedicated quality inspectors. 

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