Lactec’s Concrete and Structures Laboratory is designed for analysis, development and qualification of materials used in civil construction, as well as for the execution of tests and evaluations referring to conventional and innovative constructive systems, following up-to-date and efficient technology, such as scanning optical microscopy investigations, with applications of up to 10 thousand times, and nanoscience. Our team performs tests on the most diverse types of materials, obtaining its characterization and validation regarding the fulfillment of durability and performance requirements during its useful life.
With the support of the Concrete and Structures Laboratory, diagnostics are performed, based on the extraction of cores, to determine the mechanical, physical and chemical characteristics of reinforced concrete structures, in order to guide future necessary repairs and the techniques to be employed in recovery. It operates in the recovery of large structures such as dams, powerhouses of hydroelectric plants and bridges, making use of the injection of polymeric or cement products under pressure.
At the Concrete and Structures Laboratory, accelerated aging tests are also carried out (attack by chlorides, sulfates, salt mist, carbonation), electrochemical and gravimetric corrosion evaluation and mechanical tests to determine the carrying capacity of construction elements. We carry out optical fiber instrumentation solutions for the evaluation of deformation and temperature in concrete structures, technological control, in addition to working in the inspection of civil works.
- Exposure to aggressive environments in general, including standardized salt fog tests (NBR 8094), SO2 (NBR 8096 and NBR 13583);
- CO2 and chemical attack on floors (NBR 15575);
- Corrosion tests, corrosion potential type (ASTM 876);
- Migration and chloride and sulfate ion content (ASTM 1202);
- Electrochemical impedance spectroscopy (ASTM G106);
- Determination of gravimetric and electrochemical corrosion rate;
- Physicochemical characterization of ceramic and cementitious materials, based on techniques such as microscopy (OM, SEM/EDS, AFM, RAMAN), XRD, XRF, petrography, among others.
- Stability and structural strength, durability, characterization of conventional and innovative materials (NBR 15575).
Rebar and steel ropes
- Semi-guided bending (NBR 7480);
- Tensile strength, linear weight, run-out and elongation (NBR 6892);
- Wire Drawing (NBR 6207);
- Shear strength in steel mesh joint (NBR 5916) and tensile strength in steel wires and ropes for protension (NBR 6349).
Chemical additives for concrete
- Characterization and comparisons of resistance, start and end of grip (NBR 10908).
Aggregates for concrete
- Tests for physical and chemical characterization and resistance to attack by aggressive agents (NBR 7211).
- Physical analysis, comparative of compression strength and chemical analysis (NBR 15900).
- Tests for physical and mechanical characterization (NBR 13281);
- Squeeze flow, Khelam’s absorption and dynamic modulus of elasticity (NBR 15630);
- And others.
- Exudation index, flow, compressive strength, and service life (NBR 7681).
Cement and pozzolan
- Physical analysis: thinness (NBR 11579);
- Blaine (NBR 16372);
- Hot expandability (NBR 11582);
- Water from paste in normal consistency (NM 43);
- Start and end of grip (NM 65);
- Resistance to compression (NBR 7215);
- Specific mass (NM 23);
- Chemical characterization (NM 11);
- Loss to fire (NM 18).
- Axial compressive strength test (NBR 5739);
- Direct traction, diametrical compression traction (NBR 7222);
- Tensile strength in bending (NBR 12142);
- Elasticity Module (NBR 8522);
- Water permeability coefficient (NBR 10786);
- Hydraulic Abrasion (ASTM C 1138);
- Absorption (9778);
- Sclerometry (NBR 7584);
- Extraction of testimonies (NBR 7680);
- And others.
- VeBe, incorporated air content (NM 47);
- Humidity, CCR, CCV, CAD, and CAR dosage study (NBR 12821);
- Slump test, molding of test bodies (5738);
- Specific mass and air content (NBR 9833);
- And others.
Electrical network insulators
- Tensile and bending strength tests.
Concrete poles and crosses
- Water absorption (NBR 8451);
- Mechanical tests for characterization.
- Modulus of elasticity, Poisson coefficient (NBR 10341);
- Hard body impact, flexural strength, uniaxial compressive strength, specific mass, porosity and absorption (NBR 15845);
- And others.
Blocks, pipes and tiles
- Tensile strength, compression, water absorption and density tests (NBR 12118, 15961, 13440, 10836, 15270, 15310, 13858, 8890).
Cast iron plugs and grates
- Dimensional and compressive strength (NBR 10160).
Extruded profile (seals)
- Traction and stretching (NM 06).
* Some of the tests are accredited by the General Coordination of Accreditation of Inmetro (Cgcre). The full scope of the accredited tests can be found at www.inmetro.gov.br/laboratorios/rble.