This test is applicable to the mixing of emulsified asphalt with graded aggregate under a temperature condition of 23 ℃ ± 5 ℃. It is used to examine the mixing condition and uniformity of emulsified asphalt and aggregate during blending, and to evaluate the mixing stability of emulsified asphalt. This article will provide an in-depth analysis of the emulsified asphalt and aggregate mixing test from several aspects, including equipment and materials, test preparation, test methods and procedures, and report.

I. Instruments and Materials

1.1 Mixing Container: A ceramic pot or plastic bowl with a round bottom, approximately 150mm in diameter and 75-95mm in height.

1.2 Stirring Spatula: A stirring spatula with a rounded end, made of wood or plastic, approximately 200-300mm long.

1.3 Drying Oven: An electric forced-air drying oven, meeting the requirements of 2.1 in this specification T0602.

1.4 Balance: A balance with a weighing capacity of not less than 1kg and a sensitivity of 0.1g.

1.5 Standard sieves: Standard sieves with aperture sizes of 4.75mm, 2.36mm, 0.6mm, 0.15mm, and 0.075mm.

1.6 Stopwatch: Graduation value 0.1s, maximum permissible error ±0.10s/h.

1.7 Aggregate: Fine aggregate, manufactured sand or stone chips, 2.36–4.75mm; coarse sand, natural sand, 0.6–2.36mm; fine sand, natural sand, 0.15–0.6mm; mineral powder, limestone powder, 0–0.075mm.

Note: The aggregate in a laboratory should be relatively stable.

1.8 Test water: Tap water, with a calcium carbonate hardness not exceeding 250 ppm.

1.9 Others: Beakers, graduated cylinders, etc.

Note: Our company manufactures and sells all of the above products.

II. Test Preparation

2.1 The test shall be conducted at room temperature (23℃±5℃).

2.2 Wash the fine aggregate, coarse sand, or fine sand with tap water, dry it in an oven at 105℃±5℃ for 3 hours, and then cool it to room temperature in a desiccator.

2.3 Wash and dry the mixing container and stirring spatula, and weigh them.

2.4 Prepare the emulsified asphalt samples according to method T0602 of this specification.

III. Test Methods and Procedures

3.1 Mixing Test of Emulsified Asphalt and Coarse-Graded Aggregate

3.1.1 In a pre-weighed mixing container, weigh 335g ± 1g of fine aggregate and 130g ± 1g of coarse sand, then add 10g ± 0.5g of water and mix thoroughly with a mixing spatula.

3.1.2 Immediately weigh 35g ± 0.1g of the already mixed asphalt emulsion, transfer it to the mixing container, and continuously mix with a mixing spatula at a speed of 60r/min for 2min.

3.1.3 During the mixing process, carefully observe whether the aggregate is evenly coated with emulsion and whether there are asphalt lumps or coarse particles.

3.2 Mixing Test of Emulsified Asphalt and Fine-Graded Aggregate

3.2.1 Weigh 250g±1g of fine aggregate, 180g±1g of fine sand, and 15g±0.5g of mineral powder into a pre-weighed mixing container. Add 20g±0.5g of water and mix thoroughly with a mixing spatula.

3.2.2 Immediately weigh 55g±0.1g of the pre-mixed asphalt emulsion and transfer it to the mixing container. Mix continuously with a mixing spatula at a speed of 60r/min for 2min.

3.2.3 During the mixing process, carefully observe whether the aggregate is evenly coated with the emulsion and whether there are any asphalt lumps or coarse particles.

IV. Report

4.1 Test Item Name and Applicable Standard.

4.2 Sample Number, Name, Origin, and Specifications.

4.3 Sample Receipt Date and Sample Description.

4.4 Test Date, Name, Model, and Serial Number of Instruments and Equipment.

4.5 During the mixing process, whether the aggregate was uniformly coated with the emulsion and whether there were any asphalt lumps or coarse particles.

4.6 Other matters requiring explanation.