Test method for evaluating freezing and thawing resistance of cement-based waterproof bonding layer
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A technology of waterproof adhesive layer and test method, which is applied in the direction of testing material strength by applying stable shear force, testing material strength and strength characteristics by applying stable tension/pressure, and achieving obvious economic and social benefits
Inactive Publication Date: 2017-10-17
BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE +1
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[0010] In the selection of waterproof adhesive layer materials, researchers generally choose asphalt and specia
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[0045] Example 1:
[0046] A test method for evaluating the freeze-thaw resistance of cement-based waterproof bonding layer, including the following steps:
[0047] 1) Use acrylic emulsion to wet the prefabricated C40 cement concrete block of 300mm×300mm×50mm, the dosage is 200g / m 2 , Let stand for 5min at room temperature;
[0048] 2) Spread cement-based material on the wet cement concrete block, and use a cement spatula to smooth the thickness to 4mm; the cement base is made of Portland cement, machine-made sand, acrylic emulsion, water, and additives. Proportional composition.
[0049] 3) Put the cement concrete block coated with cement-based materials at room temperature for 0.5h;
[0050] 4) Add AC-13 asphalt mixture when the cement-based material is in the initial setting state;
[0051] 5) Cure the cement concrete composite specimens with asphalt mixture at room temperature for 14 days;
[0052] 6) Cut the cured cement concrete composite specimen into 100mm×100mm×100mm shear speci...
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[0069] Example 2:
[0070] The difference between this embodiment and Embodiment 1 is only:
[0071] Step (7), put 20 shear test pieces and 20 drawing test pieces into the rubber test box respectively, add drinking water to make it cover the top surface of the test piece by 2mm, and then freeze it in the refrigerator at -18℃ for 16h , Within 10 minutes, put the specimens frozen for 16 hours into 25℃ water and thaw for 24 hours for one cycle.
[0072] The shear strength and pull-out strength of the specimens were measured, and the test results are shown in Table 3 and Table 4.
[0073] Table 3 Shear strength of the specimen after one freeze-thaw cycle
[0074]
[0075] Table 4 The pull-out strength of the specimen after one freeze-thaw cycle
[0076]
[0077] It can be seen from Table 3 and Table 4 that after one cycle of freezing and thawing in a refrigerator at -18°C for 16 hours and thawing in water at 25°C for 24 hours, the shear strength and pullout strength of the specimens decreas...
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Abstract
The invention relates to a test method for evaluating the freezing and thawing resistance of a cement-based waterproof bonding layer. The method includes the steps of firstly, wetting a cement concrete block with an acrylic emulsion; secondly, smearing a cement-based material; thirdly, placing the cement concrete block smeared with the cement-based material under normal temperature; fourthly, laying an asphalt mixed material when the cement-based material is in an initial set state; fifthly, maintaining the cement concrete composite test piece with the asphalt mixed material under normal temperature; sixthly, cutting the maintained cement concrete composite test piece into a shear test piece and a drawing test piece; seventhly, performing freezing and thawing on each of the shear test piece and the drawing test piece in a rubber test box; eighthly, maintaining the test pieces in water; ninthly, sequentially measuring the shear strength and drawing strength of the test pieces after difference times of freezing and thawing cycles; tenthly, determining a method most suitable for evaluating the freezing and thawing resistance of a cement-based waterproof bonding layer material. The method can guide the specific application of the cement-based waterproof bonding layer material in cement concrete decks, and an applicable test method capable of sufficiently evaluating the freezing and thawing resistance of the cement-based waterproof bonding layer material is provided.
Description
technical field [0001] The invention belongs to the field of building materials and relates to a test method for evaluating the freeze-thaw resistance performance of a cement-based waterproof bonding layer. Background technique [0002] At present, the cement concrete bridge deck waterproof bonding layer materials are mainly asphalt and special waterproof materials. Most researchers use the freeze-thaw method of simulating asphalt mixture to evaluate the freeze-thaw resistance of these organic waterproof bonding layer materials. . As a new type of inorganic waterproof bonding layer material, cement-based has the advantages of high shear strength, little water influence, and strong waterproofing. It is difficult to evaluate its freeze-thaw resistance performance by using the freeze-thaw method of asphalt mixture. Therefore, it is necessary to develop a test method for evaluating the freeze-thaw resistance of cement-based waterproof bonding materials. [0003] Wang Wei selec...
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IPC IPC(8): G01N3/24G01N3/08
CPCG01N3/08G01N3/24G01N2203/0228G01N2203/0282
Inventor 季节武昊于海臣索智许鹰徐世法姜鉴恒
Owner BEIJING UNIVERSITY OF CIVIL ENGINEERING AND ARCHITECTURE
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