INADEQUATE WATER SUPPLY
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Requisites: a) Uninterrupted supply; b) Quantity recommended by the manufacturer (7.5 1 / 40 kg bag); c) Avoid obstruction of equipment |
Solutions of construction work "B"
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Solutions of construction work "C"
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Supply network to the plaster regardless of the other work services |
Supply network to the plaster regardless of the other work services |
INADEQUATE ENERGY SUPPLY
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Requisites: a) Stability of electric current; b) Avoid sudden shutdowns and burning of equipment; c) Avoid nominal voltage drops; c) Prior assessment of equipment distance to energy source to avoid loss of electrical cables |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ 380V three-phase voltage ■ Exclusive power grid |
■ 380V three-phase voltage ■ Exclusive power grid ■ Installation of transformers to raise the voltage and lower the current |
INADEQUATE SPRAY SUPPLY
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Requisites: a) Spraying capacity; b) Launching energy; c) Dosing system; d) Workability; e) Permanent maintenance; f) Equipment flow limit |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Mixer Plus Standard and PFT (Figure 3) ■ Helicoidal (rotor and stator) ■ Coupled mixer ■ Spray gypsum and mortar ■ Automatic dosage |
■ Betomaq and Putzmaster (Figure 4) ■ Helicoidal (rotor and stator) ■ Independent mixer ■ Exclusive for mortar ■ Manual dosage |
TYPE OF MORTAR USED
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Requisites: a) conventional or dry-mix mortar; b) Granulometry lower than 6mm; c) Usually dry-mix mortar |
Solutions of construction work "B"
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Solutions of construction work "C"
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Use dry-mix mortar bag of 40 kg. |
Use dry-mix mortar bag of 40 kg. |
LACK OF MAINTENENCE OF THE SPRAY EQUIPMENT
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Requisites: a) Periodicity - ordinary maintenance (daily cleaning), preventive (periodic) and corrective (occasional); b) National and imported spare parts; c) Specialized labor; d) Representatives in Brazil and region |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Imported equipment ■ Maintenance carried out jointly: construction company and contractor ■ There is a representative for parts and labor in Goiania ■ There is more than one piece of equipment in the construction work (three spraying fronts) |
■ Imported equipment ■ Maintenance carried out only by the contractor ■ Contractor easily obtains specialized labor for maintenance ■ Contractor has vast experience in using the equipment applied |
DISQUALIFICATION AND LACK OF LABOR TRAINING
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Requisites: a) Specialized and qualified for the local conditions; b) Partnerships with entities; c) Training; d) Certification; e) Spraying experience; f) Hiring own or outsourced labor (influence on responsibility and control of those involved) |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Outsourced labor ■ Additional training offered by the construction company ■ It lias many fronts, this requires a greater effort in training |
■ Outsourced labor ■ The Contractor has experience and knowledge, a qualified team and is responsible for the training |
LACK OF INSTRUCTION FOR THE MORTAR DOSAGE
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Requisites: a) Meet the specifications of the manufacturers (which vary by batch); b) Control of the incorporated air, c) Attention to the properties in the fresh state of plasticity and consistency; |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Automatic dosage done by a device coupled to the spraying equipment (Figure 5) |
■ Manual dosage (Figure 6) ■ Constant checking of the manufacturer's specification and the required properties in the fresh state ■ Periodic inspection |
LACK OF INSTRUCTION REGARDING THE CONDUCTION OF THE COATING'S CURE
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Requisites: a) Periodicity; b) Reduction of porosity and permeability; c) Increase of the bond strength |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ There is no cure |
■ Water is sprayed for 3 days after applying mortar using a hose done by the other team |
RESTRICTIONS REGARDING THE STOCK AREA OF THE DRY-MIX MORTAR
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Requisites: a) Large storage areas in function of the daily high consumption; b) Planning of delivery times; c) Permanent verification of inventories |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ High consumption, it has three service fronts ■ It lias 2 large storage areas in the 2 basements ■ Allow the distribution of the mortar on the fronts at alternative times |
■ It lias a stock area for one week (Figure 7) ■ Palletized stock - for 50 bags of 40 kg mortar makes the distribution of mortar in extra hours |
DIFFICULTY REGARDING THE MORTAR UNLOADING AND TRANSPORT
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Requisites: a) Mechanization; b) Adequate palletizing to allow passage in the elevators and apartments' doors |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Use of forklift ■ Use of 1 rack and pinion elevator and a crane ■ Use of transpallet trolleys ■ Replacement by a smaller pallet already in the storeroom, adapting to the spans. |
■ Use of forklift (Figure 8) ■ Use of 2 elevators: plank type and rack and pinion type ■ Use of transpallet trolleys |
TECHNOLOGICAL CONTROL
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Requisites: a) Properties in the fresh state: incorporated air and workability; b) Property in the hardened state: tensile strength; c) traceability |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Conduct tensile bond strength test (Figure 9) ■ Do not trace the application of dry-mix mortar |
■ Perform tensile bond strength test (Figure 9) ■ Do traceability of the application of the dry-mix mortar |
APPROACH OF THE MORTAR MANUFACTURER TOWARDS THE CONSTRUCTION WORK
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Requisites: a) Orientations; b) Control and readiness of deliveries; c) Pallets' adequacy |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Good relationship with the supplier and manufacturer of dry-mix mortar |
■ There was a problem with quality regarding adherence with the first brand of dry-mix mortar used in the construction work. ■ There was no technical assistance from the supplier/manufacturer. ■ There are problems with the variation in water dosage specification. |
THICKNESS OF DOTS, CORNERS AND EDGES
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Requisites: a) The render thickness (dots) recommended by the NBR 13749 (ABNT, 2003ASSOCIAÇÃO BRASILEIRA DE NORMAS TÉCNICAS. NBR 13749: revestimentos de paredes e tetos de argamassa inorgânicas: especificação. Rio de Janeiro, 2003.) standard, up to 20 nun (for internal coatings is closely linked to the coating's direct cost); Note: Upper thickness represents the incorporated loss and may directly impact the comparative relationship between the sprayed plaster x manual plaster. |
Solutions of construction work "B"
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Solutions of construction work "C"
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■ Rationalization of the nonstructural wall (project) (Figure 10) ■ Use of comer-beds and metal portals to avoid corners and edges (Figure 11) |
■ It is a demanding project considering corners and edges. |