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QZM-20 Type Mortar Brick Compressive Strength Test Mold
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Mold for Preparing Compressive Strength Specimens of Masonry Bricks (Single-Stage Molding)
This instrument is suitable for preparing compressive strength test specimens of masonry bricks and complies with the requirements of the compressive strength test methods specified in GB/T 2542-2012 “Test Methods for Masonry Bricks” and GBT 25044-2010 “General Requirements for Equipment Used in Preparing Compressive Strength Test Specimens of Masonry Bricks.”
The specimen (sintered common brick) shall be cut into two half-bricks, with the cut surfaces being perfectly perpendicular. The length of each half-brick after splitting shall not be less than 100 mm; if it is less than 100 mm, an additional spare specimen shall be taken to make up the required length.
Place the cut half-brick in room-temperature clean water and soak for 20 to 30 minutes, then remove it and allow it to drip on a wire mesh rack for another 20 to 30 minutes.Technical specifications of the test mold for preparing compressive strength specimens of masonry bricks (single‑step molding):
Length: 120 mm ± 15 mm (adjustable)
Width: 120 mm ± 10 mm (adjustable)
Height: 115 mm ± 5 mm (adjustable)
Use of a test mold for preparing compressive strength specimens of masonry bricks (single‑step molding)
1. After assembling the single‑step molding die, apply a lubricant to its surfaces, then place the brick specimen into the die. Insert spacer plates at the center and on both sides to set the desired thickness, seal the front and rear openings with rubber gaskets, and initially tighten the screws to secure the specimen. Remove the spacer plates, then fully tighten the screws. Finally, position the secured die on the vibration table and prepare the sample using the designated paste.2. After assembling the secondary-molding test mold, apply a lubricating oil to its surfaces, fill it with the designated paste material, and then place the brick specimen on the top screw within the mold. Ensure that the paste layer does not exceed 3 mm in thickness, secure the specimen with screws, and position the mold on the vibration table for vibration. Once the paste has hardened, demold the specimen and proceed with machining the opposite face.
Preparation of compressive strength test specimens for masonry bricks: molding die (single‑step forming) and curing.
After completing the mold trial, thoroughly clean the mold surface with a scraper, then apply a lubricant to ensure smooth operation during the next use.
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Factory Advantages
Deep expertise, comprehensive product range
√Over 10 years of dedicated R&D and manufacturing of testing instruments for highway, construction, geotechnical, asphalt, cement, and other engineering applications.
√Comprehensive category coverage: from raw material testing to construction quality control, a one-stop solution.
√Compliant with international standards such as ISO and GB, meeting the regulatory requirements of overseas projects.
Reliable quality and excellent value for money.
√ We strictly adhere to the ISO 9001 quality management system, select core components from internationally renowned brands, and conduct full inspection before shipment.
√ In-house manufacturing + a large-scale supply chain deliver strong price competitiveness, with no markups from intermediaries.
√Stable and durable, with a low failure rate, reducing operational and maintenance costs for overseas customers.
Efficient delivery, global service
√In-stock inventory plus flexible manufacturing ensures 7–15 day rapid delivery, with support for customized rush orders.
√Cangzhou’s Lin’gang District boasts a strategic location, with convenient sea and air transportation and globally traceable logistics.
√Multilingual team with 24-hour technical support, offering installation and commissioning, training, a three‑year warranty, and ongoing follow-up services.
Operating with integrity and backed by extensive experience.
√13 years of industry expertise, serving over 30 countries and regions worldwide.
√The principle of “integrity in business, mutual benefit.”
√Deep understanding of international engineering standards and procurement processes, with efficient communication and seamless collaboration.
Frequently Asked Questions
Is the universal materials testing machine experiencing loading stalling or abnormal zeroing of load data?
1. Loading lag: Clean the lead screw and guide rails, apply lubricant, and remove debris from the transmission components. 2. Zeroing anomaly: Restart the equipment system, calibrate the load and displacement zero points, and check for poor electrical contact in the sensor wiring. 3. Overloading is strictly prohibited; before testing, verify that the grips are securely tightened to prevent eccentric loading of the specimen.
How often should in‑instrument verification be performed? Which instruments are required to undergo it?
High‑precision, high‑frequency‑use, and drift‑prone equipment (such as balances, penetration testers, water permeability testers, and sensor‑type devices) shall undergo intermediate verification every three months; routine equipment shall be verified every six months. Equipment that is within the verification/calibration interval, has been repaired following a malfunction, or has been relocated must undergo additional intermediate verification, with complete verification records maintained.
Is the repeatability of pendulum-type pavement friction coefficient measurements poor?
Key points for resolution: Prior to testing, thoroughly clean the pavement at each measurement point, ensuring there is no standing water, dust, or debris; calibrate the instrument’s level and zero point to ensure a standardized pendulum‑drop trajectory; strictly control the pendulum’s sliding distance; avoid conditions such as strong winds, wet pavement, or abrupt temperature changes; and calculate the average of multiple measurements taken at the same point.
How should one handle cases where the pavement infiltration meter data exceeds allowable error limits, exhibits leakage, or shows abnormal readings?
1. Sealing leaks: Inspect the base seal for aging or damage and replace it promptly; before testing, firmly press down on the base to expel any residual air inside. 2. Data deviation > ±2%: Calibrate the level sensor, clean any fouling from the graduated cylinder, and check for damage to the scale markings. 3. Compliance with new regulations: For seepage rates ≤ 300 mL/min, existing equipment may continue to be used; for rates > 300 mL/min, the accuracy of older equipment fails to meet standards, and such equipment must not be used.
Can the old Marshall compaction apparatus and stability tester still be used?
According to the 2025 revised asphalt testing procedures, after adjusting the indenter configuration on the Marshall stability test apparatus, existing instruments currently in use may continue to be operated normally without mandatory replacement; only periodic calibration to maintain accuracy and ensure equipment integrity is required.
What are the causes of uneven compaction and layered cracking in molded specimens during compaction testing?
Main causes: non‑vertical drop of the compaction hammer, rail jamming, excessive deviation in hammer weight, uneven layer thickness during loading, insufficient number of blows, or overload. Solutions: regularly lubricate the guide rails; verify and correct the vertical alignment of the hammer; strictly follow the procedure for layered material placement and step‑by‑step compaction; ensure that hammer weight and drop height comply with standards; and prevent over‑thick layers.
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