Maintenance of Prefabricated Assembled Houses

When maintaining prefabricated assembled houses, it is essential to focus on issues such as joint gaps, differences in material properties, and defects in construction techniques, and take targeted measures for comprehensive treatment.

I. Joint Gap Issues and Treatment

Cracking of the ceiling decorative layer at the joints of composite floor slabs is a common problem, primarily caused by structural deformation due to foundation settlement, temperature changes, and material shrinkage, as well as relative deformation accumulation stress resulting from differences in elastic modulus and coefficient of linear expansion between the prefabricated composite slabs, plaster layers, and decorative coatings. Additionally, improper joint treatment (such as insufficient roughening of the concrete surface or unreliable steel bar connections) and defects in the application of decorative coatings (such as improper temperature and humidity control or uneven coating thickness) can exacerbate the risk of cracking.
Treatment Measures:

1. Material Repair: Utilize new materials such as PCAA prefabricated partition wall anti-crack and waterproof adhesive for comprehensive treatment. This material, based on waterborne acrylic resin and mixed with high-elastic functional materials and inorganic nanomaterials, is non-toxic, odorless, and has strong adhesive properties, effectively repairing cracks at the joints and enhancing waterproof performance.
2. Process Optimization: Ensure that the concrete surface at the joints is sufficiently roughened and that the steel bar connections are reliable to avoid stress concentration due to improper contact surface treatment.

II. Material Property Difference Issues

The differences in elastic modulus and coefficient of linear expansion between prefabricated components and cast-in-place materials (such as plaster layers and decorative coatings) can lead to relative deformation under temperature changes or load, resulting in cracking or water leakage at the interfaces.
Treatment Measures:

1. Material Matching: Select supporting materials with properties similar to those of the prefabricated components to reduce deformation incoordination caused by differences in elastic modulus.
2. Interface Treatment: Add anti-crack mesh fabric or high-elastic sealant at the joints to enhance interface adhesion and disperse stress concentration.

III. Construction Technique Defect Issues

Aging of sealing materials and improper construction (such as discontinuous waterproof layers or rough joint treatment) can lead to wall water leakage, dampness, and mold growth; severe quality defects such as honeycombing in concrete and steel bar corrosion require timely replacement of components and reinforcement of load-bearing joints.
Treatment Measures:

1. Process Supervision: Strictly inspect enterprise qualifications and component test reports, focusing on joint techniques and waterproof treatment to ensure that sealing materials are of qualified quality and construction is standardized.
2. Defect Repair: For components with quality defects, use high-pressure grouting to repair honeycombing, apply anti-rust paint after rust removal; replace severely corroded steel bars and strengthen joint bearing capacity by adhering carbon fiber sheets or adding steel supports.

During the maintenance process, it is necessary to combine structural testing with material property analysis to develop a systematic plan and avoid problem recurrence caused by a single measure.