Air Entrainment-Mortar

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Air Entrainment-Mortar

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Blaine Air Permeability Apparatus

The Blaine Air Permeability Apparatus determines the fineness of Portland cement in terms of specific surface area expressed as the total surface area in square centimeters per gram of mortar or cement. The Blaine works by drawing a definite quantity of air through of bed of cement exhibiting a definitive porosity value. The number and size of the pores in a prepared bed of definite porosity is a function of the size of the particles and determines the rate of airflow through the bed. This procedure is outlined in ASTM C204, Method A and AASHTO T153. The Humboldt Blaine Air Permeability Apparatus consists of: calibrated U-tube manometer, ground glass joint, stainless steel test cell and plunger, rubber aspirator bulb and perforated disc. Includes an 8 oz (226.8g) bottle of red manometer fluid, filter paper, wood block for holding test cell during filling and a funnel. Mounted on finished wood panel with rubber-footed base. To perform this test, NIST Portland Cement #114R is required by the ASTM standard for calibration. See Accessories H-3817 and H-3817.20.

Blaine Apparatus, Electronic, Semi-Automatic

Determines the fineness of cement in terms of specific surface expressed as total surface area square centimeters per gram. To obtain the most accurate results, the test should be performed in a temperature-controlled environment. The Semi-automatic Blaine Apparatus provides more accuracy and precision than provided by the manual Blaine Apparatus. The device uses an automatic pump and timer to evaluate the time precisely. Calibration of this unit is done by using various reference sands, which can be purchased below in the accessories.

Bleed Stability of Cementitious Grout Kit, ASTM C1741

Humboldt's H-3601 Bleed Stability Grout Kit is used to evaluate the bleed stability of a freshly-mixed grout under static pressure (Schupack Pressure Bleed Test). It can be used in the field as a quality control test or in the laboratory to qualify grout materials. When using this test method, contract documents should reference the number of required tests, as well as the test pressure and acceptance criteria desired for the testing procedure.

Cement Bleeding Apparatus

Used to determine bleeding rate and bleeding capacity of cement paste and mortar by direct and continuous procedure. Includes noncorrosive metal container for paste or mortar, collecting ring, support stand and necessary glassware. Rubber-covered double V-jaw burette clamp holds stopcock in position; single rubber-covered jaw clamp supports the burette and funnel assembly.

Multiple Bond Strength Pull-Off Tester, 230V 50-60Hz

The multiple Bond Strength Pull-off Tester is used for testing the bond strength of adhesives, mortar, coatings, paints, etc. It provides computer-controlled test execution and evaluation and is servo-controlled Class 1 according to ISO 7500-1. The Multiple Bond Strength Pull-off Tester is optimized for plates 400 x 400mm (15.78" x 15.78")to glue on samples, for example, 50 x 50mm (1.96" x 1.96) (test stamps must be ordered separately). Double-operative test cylinder in servo slide quality (extra low-friction), with piston stroke 100mm and a rotation prevention Massive, torsion-resistant machine frame for optimal determination of malleability until demolition of the sample (only possible with a position measurement system). Heavy-duty linear slides for easy insertion of the plates. Lifting table with two-handed control to position the test plate on the counter holder, which can be adjusted to test different plate heights. The position of the traction body is via low-friction linear slides. The machine frame stands on a control cabinet (optional: prepared for connection with a control cabinet of a standard cement/mortar testing machine).

Cement Calorimeter, Digital

Features precision digital thermometer for determining heat of hydration of cements by measuring difference between heat of solution of dry cement and heat of solution of a separate sample partially hydrated for 7 to 28 days. Constant-speed stirrer maintains uniform temperature throughout liquid and supplies sufficient agitation to keep solid reactant suspended in the acid mixture. Includes insulated wood case, insulated 1G (3.8L) can; 1 pt. (0.47L) vacuum jar with stopper; 2-channel, Precision Digital Thermometer; plastic funnel; stirring paddle and chuck; geared synchronous motor.

Langavant Method Calorimeter

Used to measure the heat of hydration of cement by the semi-automatic Langavant method. Test calorimeter includes factory calibration certificate. Temperature recorder provides (4) input channels for recording and transmission of temperature values. Analysis software provides reporting and editing function for calculating the heat of hydration. Unit includes: test calorimeter; reference calorimeter; mortar-sample container, temperature recording device and analysis software. Power for unit is supplied by USB from a PC or laptop. Does not include required PC.

Autoclave, Cement

Uses accelerated means of estimating delayed expansion of Portland cement caused by hydration of CaO and MgO. Test bars are exposed to controlled steam pressure and corresponding constant temperature. Unit produces 60-350 psi (0.4-2.4MPa) range of pressures and consists of steam vessel, pressure regulator, pressure gauge (0-600 psi x 5 psi), air vent valve, power switches and safety pop valve set at 350psi. Includes thermometer, wrench and 5 gaskets. Additional gaskets, heating units and safety pop valves are available as replacement parts. Chamber dimensions: 6.125" ID x 16". Overall dimensions: 17" x 48" x 28" (431 x 1219 x 711mm) 1700W maximum power demand. 220V version comes with transformer.

Manual 30,000lbs (133.5kN) Humboldt Compression Machine

Frame opening dimensions are measured without test platens installed in machine. Overall machine dimensions are measured with the stand, including machines where it is optional. Humboldt offers several excellent controllers for use with our concrete compression machines allowing you to choose the controller that best fits your application.

Combined Compression-Flexural Testing Machine

A combined compression flexural testing machine is a versatile laboratory instrument, and professionals searching for Combined Compression/Flexural Testing Machine Price in Bangladesh often require dependable equipment for evaluating both compressive and flexural strength of concrete and construction materials. Designed for dual testing functions, this machine ensures accurate and consistent results in structural material analysis. Built with robust steel construction and precision engineered components, the combined testing machine delivers stable performance under varying load conditions. Its integrated design allows seamless switching between compression and flexural testing, improving laboratory efficiency and reducing the need for multiple instruments. The user friendly operation ensures accurate load application and repeatable test results for professional use.

RA100 Cement

Provides a non-destructive, quick determination of compressive strength and modulus of elasticity on samples of cement, mortar and concrete. This is provided by mechanical stimulation of resonance frequencies. The RA100 Concrete quickly measures the sound velocity according to the Impact Resonance Method. It also directly determines compressive strength and static and dynamic modulus of elasticity, as well as with calibration values.

3-gang Mold, 40 x 40 x 160mm

This mold is designed to produce 10" effective gauge length prism test bars. It features removable partitions, base, and end plates. The effective gauge length is measured from the inside end of the studs. The molds produce cement prism specimens that are 11.25" long. Including the studs, the outside to-outside length of the specimen is 11.625".

Air Entrainment – Mortar

Air Entrainment in mortar is an important property that improves the workability, durability, and resistance of cement-based construction materials. It refers to the intentional incorporation of microscopic air bubbles into fresh mortar using air-entraining agents. These tiny, evenly distributed air voids enhance performance during application and long-term service conditions.

Air entrained mortar is widely used in masonry work, plastering, rendering, and repair applications where improved consistency, freeze-thaw durability, and reduced water demand are required.

What is Air Entrainment in Mortar?

Air entrainment is the process of introducing controlled amounts of microscopic air bubbles into mortar mixtures through specialized admixtures. These bubbles remain stable throughout mixing and placement and create small pressure relief chambers inside the hardened mortar.

Unlike accidental trapped air, entrained air is intentionally generated and uniformly distributed to provide measurable performance benefits.

Typical air content in mortar generally ranges between 5% to 20%, depending on application requirements and standards.

Purpose of Air Entrainment Testing in Mortar

Air entrainment testing is performed to determine the percentage of entrained air present in mortar and to ensure quality control during production and construction.

The primary objectives include:

  • Improve mortar workability and consistency
  • Increase resistance to freeze-thaw cycles
  • Reduce bleeding and segregation
  • Enhance bonding characteristics
  • Improve durability and service life
  • Lower water demand without reducing performance
  • Ensure compliance with construction specifications

Importance of Air Entrainment in Construction

Mortar quality directly affects the strength and lifespan of masonry structures. Proper air entrainment helps maintain uniformity and reduces construction defects.

Enhanced Workability

Entrained air acts as microscopic ball bearings that improve flow characteristics, making mortar easier to spread and finish.

Better Freeze-Thaw Resistance

In cold climates, water inside hardened mortar expands during freezing. Air voids provide space for expansion and reduce cracking.

Reduced Water Requirement

Air entrainment can improve consistency while requiring less mixing water.

Improved Durability

Controlled air content increases resistance against environmental deterioration and extends service life.

Air Entrainment Test Procedure for Mortar

The testing procedure generally involves:

Sample Preparation

Fresh mortar is prepared according to applicable standards and mixed uniformly.

Filling the Test Container

Mortar is placed into a calibrated testing chamber and compacted carefully.

Measurement Process

Specialized equipment measures entrained air content through pressure or volumetric methods.

Result Evaluation

Measured values are compared against project specifications and standard limits.

Equipment Used for Air Entrainment Testing

Common equipment includes:

  • Air Entrainment Meter
  • Mortar Mixing Equipment
  • Measuring Containers
  • Calibration Devices
  • Compaction Tools
  • Pressure Testing Apparatus

Factors Affecting Air Entrainment in Mortar

Several variables influence final air content:

  • Type of cement
  • Sand grading and particle shape
  • Mixing time and speed
  • Water-cement ratio
  • Admixture dosage
  • Ambient temperature
  • Construction practices

Proper monitoring ensures consistent mortar performance.

Applications of Air Entrained Mortar

Air entrained mortar is commonly used in:

  • Brick masonry construction
  • Block laying applications
  • Plastering and rendering
  • Repair and rehabilitation projects
  • Industrial flooring systems
  • Infrastructure construction
  • Residential and commercial buildings

Benefits of Professional Air Entrainment Testing

Professional testing provides:

  • Accurate quality control
  • Improved construction reliability
  • Reduced maintenance costs
  • Compliance with industry standards
  • Consistent project performance