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LBTY-3E Fully Automatic Aggregate Soundness Tester

This method is used to determine the resistance of crushed stone or gravel to repeated cycles of saturation in a sodium sulfate solution followed by drying, under the pressure generated by sodium sulfate crystallization, without significant damage or loss of strength. It is a standard procedure for assessing the soundness (also referred to as stability) of aggregates. Soundness refers to the ability of an aggregate to withstand multiple immersion–drying cycles in a saturated sodium sulfate solution without experiencing substantial degradation or a reduction in strength. It serves as an important indicator of an aggregate’s freeze‑thaw resistance. Experimental results show that, for the same rock type, once it has been crushed into gravel or crushed stone, the crushing process disrupts the rock’s original structure, leading to lower freeze‑thaw resistance compared with the intact parent rock. Therefore, in addition to testing the soundness of the original rock, it is also necessary to evaluate the soundness of the crushed aggregate. This instrument features automatic heating, temperature maintenance, programmable cycle counts, and adjustable holding times, all controlled via digital display.

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Pavement, Subgrade, and Aggregate Testing Equipment

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lbt@lbt.ltd

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LBTY-3E Fully Automatic Aggregate Soundness Tester

Description

Product Introduction:

This method is used to determine the resistance of crushed stone or gravel to repeated cycles of saturation in a sodium sulfate solution followed by drying, under the pressure generated by sodium sulfate crystallization, without significant damage or loss of strength. It is a standard procedure for assessing the soundness (also referred to as stability) of aggregates. Soundness refers to the ability of an aggregate to withstand multiple immersion–drying cycles in a saturated sodium sulfate solution without experiencing substantial degradation or a reduction in strength. It serves as an important indicator of an aggregate’s freeze‑thaw resistance. Experimental results show that, for the same rock type, once it has been crushed into gravel or crushed stone, the crushing process disrupts the rock’s original structure, leading to lower freeze‑thaw resistance compared with the intact rock. Therefore, in addition to testing the soundness of the original rock, it is also necessary to evaluate the soundness of the crushed aggregate. This instrument features automatic heating, temperature maintenance, cycle counting, and holding‑time control, all implemented via digital display and automated regulation.

Technical Specifications:

Parameter Category	Parameter content
Container	Double-layer stainless steel heating and temperature-controlled container
Coarse Aggregate Triangular Mesh Basket	The mesh has an outer diameter of 150 mm, a height of 150 mm, and an aperture of 2.36 mm. The mesh basket has an outer diameter of 100 mm, a height of 150 mm, and a mesh aperture of 2.36 mm; it is made of stainless steel.
Fine aggregate three-legged wire basket	The mesh basket has an outer diameter of 70 mm, a height of 70 mm, and a mesh aperture of 0.15 mm; it is made of stainless steel.
Power supply voltage	220V
The temperature should be maintained within a specified range.	0–99°C (adjustable)
Number of lifts	25 times
Heating power	2000W
Refrigeration capacity	800W
Motor power	50W

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FAQs

Do you supply full-set testing instruments for asphalt and geotechnical engineering projects?

We offer complete lab solutions including asphalt viscosity tester, asphalt rutting tester, geotextile permeability tester, low-temperature flexibility tester and concrete/cement test equipment, covering raw material detection for road, water conservancy and construction engineering projects

Can you customize fixtures or test machines based on our special test requirements? How about after-sales service and warranty?

We provide non-standard customization of test equipment and customized fixture clamps according to customers’ specimen size and test standards. All our testing machines enjoy 12-month factory warranty; overseas customers get remote online debugging guidance, spare parts supply and technical operation training. Our products have been exported to over 70 countries globally

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Does your pipe pressure burst testing machine control test temperature automatically? What’s its main application?

Yes, the constant-temperature circulating system keeps stable test environment during long-time hydrostatic resistance and instant burst pressure measurement of thermoplastic pipes. It complies with GB6111 standard and serves raw material inspection, new product R&D for plastic pipe manufacturers, third-party testing labs and university laboratories.

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Customer Reviews

European Plastic Pipe Manufacturer｜Purchase: Ring Stiffness & Hydrostatic Burst Tester

From Thomas Bennett, Quality Director, UK plastic pipe factory

2026.06.05

★★★★★

“We have purchased two sets of pipe testing equipment from Laibote (Tianjin) for 18 months. The ring stiffness and hydrostatic burst testing machines run stably for daily batch inspection, test data matches ISO standard requirements precisely, and the intelligent test software is easy for our operators to master. Their after-sales team offers timely remote technical guidance whenever we have operational problems, spare parts supply is efficient. We have arranged a second bulk order for our new production workshop and will recommend Laibote’s testing machines to our industry partners across Europe.”

Middle East Construction Lab｜Purchase: Universal Electronic Testing Machine & Geotextile Test Equipment

From Mohamed Kareem, Lab Manager, UAE third-party construction inspection institute

2026.06.05

★★★★★

“We compared multiple testing equipment brands from Europe and China before cooperating with Laibote. Their WDW universal tester and full-set geotextile testing instruments meet local construction testing standards perfectly. Custom fixtures tailored per our specimen specifications save much testing time. Pre-sale technical communication was patient and professional; engineers provided online operation training after goods arrived. Stable machine performance greatly improves our laboratory’s detection efficiency, we are satisfied with cost performance and overall service.”

Southeast Asia Rubber & Polymer Factory｜Purchase: Vicat Softening Point & Tensile Testing Machine

From Tanaka Hiroshi, R&D Supervisor, Indonesia rubber materials enterprise

2026.06.05

★★★★★

“Laibote’s Vicat softening point tester and electronic tensile machine have been applied to our raw material incoming inspection and new formula development for over one year. High testing accuracy effectively controls our product defect rate. What impresses us most is their responsive after-sale service; technical staff reply our troubleshooting requests within 24 hours even for time zone differences. Compared with expensive European brands, Laibote’s equipment balances quality and price excellently, we plan to expand procurement of auxiliary testing instruments next quarter.”

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