Bentonite composition modified asphalt and its preparing method
A technology of modified asphalt and bentonite, which is applied in the direction of building structure, building components, building insulation materials, etc., can solve the problems of insignificant improvement of high temperature performance, expensive SBR, affecting the uniformity of asphalt, etc., and achieve low temperature anti-cracking performance And good anti-aging performance, high and low temperature performance improvement, and the effect of improving road performance
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[0019] Example 1: Calcium-based bentonite was first selected and de-sanded, the de-sanded bentonite was dried, dried, ground and sieved with a 325-mesh sieve, and then 1 part of the sieved bentonite was added to 94 parts of molten matrix asphalt. And keep stirring to avoid local overheating. While stirring, add 3 parts of powdered styrene-butadiene rubber, keep the temperature at 170°C and high shear at 4000 rpm / min shear rate, stir in an asphalt emulsifier for 50 minutes to make it evenly mixed to obtain modified asphalt. It is determined that the 5 degree ductility (5cm / min, 5℃, cm) is 164, the 25 degree penetration degree (25℃, 100g, 5s, 0.1mm) is 63, and the softening point (℃) is 56; rotating film oven experiment (RTFOT) After 5 degrees of ductility (5cm / min, 5°C, cm) is 67, and the penetration ratio (%) is 84.
[0020] by figure 1 It can be seen that the softening point and low temperature ductility of asphalt are improved, and the high and low temperature performance of as...
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[0022] Example 2: The calcium-based bentonite is first selected and de-sanded, the de-sanded bentonite is dried, dried and then ground and sieved with a 325-mesh sieve. The bentonite obtained by the sieving is organically activated with quaternary ammonium salt , So that the spacing between the layers is increased, which is beneficial to the easier insertion of some substances in the asphalt. Then 3 parts of sieved organic bentonite is added to 96 parts of molten base asphalt, and continuous stirring is carried out to avoid local overheating. While stirring, add 1 part of powdered styrene butadiene rubber, keep the temperature at 180°C and high shear at 4500 rpm / min shear rate, and stir in an asphalt emulsifier for 40 minutes to make it evenly mixed to obtain modified asphalt. It has been determined that the 5-degree ductility (5cm / min, 5℃, cm) is 160, the 25-degree penetration (25℃, 100g, 5s, 0.1mm) is 62, and the softening point (℃) is 56; rotating film oven experiment (RTFOT) A...
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[0023] Example 3: First, the calcium-based bentonite was sorted and de-sanded, and the bentonite was de-sanded with sodium salt (Na 2 CO 3 Or NaHCO 3 Etc.) Sodiumize, dry, grind and sieve with a 325-mesh sieve, then add 1.5 parts of sieved bentonite to 98 parts of molten base asphalt, and keep stirring to avoid local overheating. While stirring, add 2.5 parts of powdered styrene butadiene rubber, keep the temperature at 190°C and high shear at 6000 rpm / min shear rate, and stir in an asphalt emulsifier for 30 minutes to make it evenly mixed to obtain modified asphalt. It is determined that the ductility of 5 degrees (5cm / min, 5℃, cm) is 65, the penetration degree of 25 degrees (25℃, 100g, 5s, 0.1mm) is 67, and the softening point (℃) is 55; rotating film oven experiment (RTFOT) After 5 degrees of ductility (5cm / min, 5°C, cm) is 45, and the penetration ratio (%) is 80.
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