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How wet spray machines handle high-humidity environments
Release time:
2025-10-10
Source:
Author:
Summary:
I. The Mechanism of How High Humidity Affects the Wet Spraying Process
(Special effects under conditions where relative humidity exceeds 85%)
1. Material Property Variation
Pre-hydration of cementitious materials: When humidity exceeds 90%, the pre-hydration rate of cement reaches 15–20%.
Risk of rapid-setting agent failure: Aluminate-based rapid-setting agents experience a 30-40% reduction in reaction efficiency.
Aggregate moisture fluctuation: Surface moisture content deviation can reach ±2% (the standard requirement is ±0.5%).
2. Improper Process Parameters
Jet chromatography water: Water separation rate increases by 50% in humidity-saturated environments.
Bond strength degradation: Interfacial adhesion loss reaches 0.8–1.2 MPa
Abnormal setting time: Initial setting time extended by 2–3 times (measured data)
II. Adaptation and Improvement of Material Systems
1. Optimization of Cementitious Materials
Employing a sulfoaluminate-silicate composite cement (in a 3:7 ratio)
Add 0.1–0.3% of alkyl silane-based hydrophobic agents
Controlled specific surface area of 350–400 m²/kg (BET method)
2. Moisture-Resistant Modified Additive
Composite Rapid Setting Agent (Sodium Aluminate + Organic Amine)
Polymer thickener (HPMC content: 0.05–0.1%)
Nano-SiO₂ vapor-phase powder (1.5–2% addition)
3. Aggregate Preprocessing Technology
Hot-air drying system (with moisture content stabilized at 3-5%)
Particle size distribution optimization (percentage of particles >4.75mm <15%)
III. Special Modifications to the Equipment System
1. Moisture-Resistant Wet Spray Machine Configuration
Sealed料仓 (humidity control <70%)
Heated transfer pipeline (maintained at 40±5℃)
Pressure Balance System (In-cabin pressure difference < 0.1 MPa)
2. Smart Control System Upgrade
Humidity compensation algorithm (automatically adjusts when RH > 85%)
Real-time Moisture Content Monitoring (Microwave Moisture Measurement Accuracy ±0.3%)
Dynamic water-cement ratio control (fluctuation range ±0.01)
3. Dedicated Jet Components
Anti-condensation Nozzle (PTFE Coated)
Air curtain isolation device (surrounding airflow velocity of 3 m/s)
Multi-stage dewatering system (capable of removing 10-15% free water)
IV. Key Points for Construction Process Control
1. Environmental Control Measures
Work area maintained at slight positive pressure (+50–100 Pa)
Local dehumidification unit (dew point temperature < 15°C)
Infrared preheating base surface (surface temperature 25–30°C)
2. Special Process Parameters
Jet pressure reduced by 10-15% (0.35-0.45 MPa)
Jet distance increased by 20% (1.2–1.5 m)
Layer thickness reduced by 30% (30–40 mm)
3. Strengthen the Maintenance System
Delay the start of curing by 2 hours after final setting.
Employing a moisture-permeable curing membrane (WVTR > 500 g/m²·24h)
Combined use of养护 agents (silane + acrylate)
5. Quality Verification Standards
1. Performance Testing Metrics
Moist surface bond strength ≥ 1.8 MPa (pull-off method)
Water penetration height ≤ 30 mm (waterproofing test)
Drying shrinkage rate ≤ 0.025% (28 days)
2. Microstructural Requirements
SEM observation shows porosity < 8%.
XRD analysis shows delayed ettringite content is less than 3%.
MIP testing has the most likely pore size < 50 nm.
VI. Engineering Application Examples
Hong Kong-Zhuhai-Macao Bridge Immersed Tunnel Repair Project:
Environmental humidity: 92–95% RH
Using modified C40 shotcrete
Measured data:
Initial setting time: 42 min (standard environment: 28 min)
28-day strength compliance rate: 100%
No visible cracks detected (1000 m² inspection area)
RELATED INFORMATION
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Changsha Base:Hunan Zenxon Heavy Industry Technology Co., Ltd.
Address: Jinrong Tongxin International Industrial Park, Changsha High-tech Zone
Loudi Base:Hunan Haoda Heavy Industry Technology Co., Ltd.
Address: Loudi Avenue, Loudi High-tech Industrial Development Zone, Lianyuan City, Loudi City, Hunan Province
Telephone:400-186-0868
E-mail:3804246750@qq.com
E-mail:19967177733@163.com
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