CN105838091A

CN105838091A - Application of combination of biomass heavy oil and rice hull ash as asphalt modifier

Info

Publication number: CN105838091A
Application number: CN201610207774.0A
Authority: CN
Inventors: 韩振强; 沙爱民; 翟瑞鑫; 童峥; 蒋玮; 刘状壮; 邹晓龙
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2016-04-05
Filing date: 2016-04-05
Publication date: 2016-08-10
Anticipated expiration: 2036-04-05
Also published as: CN105838091B

Abstract

The invention relates to an application of a combination of biomass heavy oil and rice hull ash as an asphalt modifier. Test of the penetration degree, the softening point and the ductility of asphalt and dynamic shear rheology (DSR) test of the asphalt prove that the composite modified asphalt can be used to improve the insufficient high temperature stability, poor durability and poor fatigue resistance of biomass heavy oil modified asphalt and obviously improve the low temperature crack resistance of rice hull ash modified asphalt, and also can integrate the advantages of the biomass heavy oil modified asphalt and a rice hull modifier to make an asphalt cement and a mixture thereof have good low-temperature crack resistance, high-temperature stability and durability, so the combination of biomass heavy oil and rice hull ash is a modified asphalt material with excellent comprehensive performances.

Description

Biomass heavy oil and rice hull ash combine the application as asphalt modifier

Technical field

The invention belongs to asphalt modifier technical field, be specifically related to the application as asphalt composite modifier of biomass heavy oil and rice hull ash.

Background technology

Colophonium, as a kind of important engineered building materials, is widely used in the every field of civil engineering construction.China is vast in territory, climate type relates to the relatively large span of the southeastern coast moistening from the Northwest of dry cold to sweltering heat, the asphalt material only possessing excellent high-temperature behavior or cryogenic property can not meet Practical Project mesoclimate environment and the demand of load, and this just requires that asphalt material has good overall performance.The composite modified asphalt that biomass heavy oil and rice hull ash are jointly formed absorbs bio-oil modified pitch cryogenic property and the excellent advantage of rice hull ash modified pitch high-temperature stability the most simultaneously, compensate for bio-oil modified pitch high-temperature behavior difference and the defect of rice hull ash modified pitch low-temperature cracking-resistance deficiency simultaneously, obtain a kind of high-temperature stability, low-temperature cracking-resistance good, the modified asphalt material of stability and durability, meets complex engineering and uses the environment combination property requirement to Colophonium.

Summary of the invention

Shortcomings and deficiencies for prior art, inventor finds oily to lithotroph ash rice hull ash and organic-biological under study for action as composite asphalt modifier, the interfacial effect between modifying agent and Colophonium can be changed, obtain a kind of high temperature all good with cryogenic property, and the modified asphalt material of stability and durability.

To this end, the invention provides rice hull ash and bio-oil combines the application as asphalt modifier.

Find based on the studies above, present invention also offers a kind of modified pitch.Modified pitch provided by the present invention includes Colophonium, rice hull ash and bio-oil.

Compared with prior art, it is an advantage of the current invention that:

(1) bio-oil-rice hull ash composite modified asphalt can be greatly improved the low-temperature ductility of rice hull ash modified pitch, shows excellent crack resistance at low-temperature, meets the use requirement under lower temperature；

(2) bio-oil-rice hull ash composite modified asphalt can improve high-temperature stability and the anti-fatigue performance of bio-oil modified pitch, meets current high temperature, heavy duty, the canalized traffic requirement to asphalt performance.

(3) bio-oil-rice hull ash modified pitch has become flowable state within the temperature range of 90～110 degrees Celsius the most, it is possible to achieve Colophonium warm mix, reduces energy consumption.

Accompanying drawing explanation

Fig. 1 is that embodiment 1,2,3 contrasts with reference example 1 needle penetration；

Fig. 2 is that embodiment 1,2,3 and reference example 1 softening point contrast with ductility；

Fig. 3 is 40 DEG C of embodiments 1,2,3 and reference example 1 complex modulus curve chart；

Fig. 4 is 40 DEG C of embodiments 1,2,3 and reference example 1 phase angle curve chart；

Fig. 5 is 40 DEG C of embodiments 1,2,3 and reference example 1 loss modulus curve chart；

Fig. 6 is embodiment 1,2,3 and reference example 1 Rutting parameter curve chart under different temperatures.

Detailed description of the invention

The rice hull ash of the present invention is that the means taking aerobic to calcine for raw material with rice husk process, and calcining heat is generally 400-800 degree Celsius.

The bio-oil of the present invention is that the high temperature pyrolysis extractings such as lignin, animal wastes, garbage oils and fats or crop by-product straw obtain.

The Colophonium of the present invention is asphalt, kerites, biomass Colophonium etc.

Particularly preferred embodiment of the invention given below, is used for further illustrating the present invention.These embodiments are only used for those skilled in the art and sufficiently understand the present invention rather than for limiting the scope of the present invention.Within every equivalents carried out on technical solution of the present invention or replacement belong to claimed interest field.

Embodiment:

Raw materials used in following example it is:

Colophonium: domestic be numbered No. 70 heavy traffic asphalt, technical specification meets the technology requirement of " standard specification for construction and acceptance of highway asphalt pavement " JTG F40-2004；

Bio-oil: biomass energy processing in Shaanxi one is produced and obtained by wood flour rapid cleavage, and oil body is black paste, boiling point 76 degrees Celsius；

Prepared by rice hull ash: first, the rice husk obtained from Hubei Prunus persica f. compressa one rice-hulling mill is put in draft furnace, constant temperature is kept two hours after temperature being increased to 600 DEG C in five minutes, period ensures that air can enter in stove and can be fully contacted with rice hull ash makes carbon therein be converted into carbon dioxide, with the carbonization avoiding high temperature to cause, the content of silicon dioxide in rice hull ash after reduction finished product；Then, close draft furnace and stand one hour, then rice hull ash therein is taken out, put into ball mill grinding 60min；Finally, the rice hull ash of high-specific surface area and dioxide-containing silica is obtained；

Prepared by rice hull ash modified pitch: a) Colophonium sample prepares: being heated in convection oven 2～3 hours by domestic AH-70 Colophonium, baking oven design temperature is 135 DEG C；B) homogenizer whip modified asphalt system: the rice hull ash of matched doses is added and is stirred in the Colophonium of baking oven for heating to 135 DEG C, first low-speed mode (1000rad/s) is selected to add in No. 70 matrix pitches by the rice hull ash (or limestone dust) of matched doses in three minutes, switch to fast mode (3000rad/s) stirring 20min after low-speed mode stirring 10min, obtain modified pitch sample.

Summarizing the experience through test of many times, after stirring terminates 24 hours for the first time, modified pitch surface has uneven pitted skin and bubble.Therefore, the stirring of secondary Colophonium homogenizer need to be carried out, and stir one minute with Glass rod after agitation, such that it is able to obtain approximating the modified pitch surface of minute surface, regard it as stirring, meet the use standard of modified pitch.Rice hull ash chemical composition analysis is as shown in table 1:

Table 1

Chemical composition	SiO₂	K₂O	Ca O	Other
					Mass percentage content %	88.84	3.99	1.60	5.57

Prepared by bio-oil modified pitch: a) Colophonium sample prepares: being heated in convection oven 2～3 hours by domestic AH-70# Colophonium, baking oven design temperature is 110 DEG C；B) bio-oil is modified: added by the bio-oil of certain mass in ready Colophonium, owing to bio oil boiling point is 76 degrees Celsius, and produce owing to this bio oil is mainly used in fuel use, wherein contain a certain amount of water and gas, after it adds Colophonium, have a large amount of bubble emit asphalt overflowing of sening as an envoy to, easily cause danger.Therefore, manually must stir 10 minutes with Glass rod, be stirred 20 minutes with 1000r/s by homogenizer again after making bubble substantially eliminate, bio-oil modified pitch can be obtained.

Prepared by bio-oil-rice hull ash composite modified asphalt: a) Colophonium sample prepares: being heated in convection oven 2～3 hours by domestic AH-70 Colophonium, baking oven design temperature is 110 DEG C；B) in the high speed whip modified stage: first add in ready Colophonium by the bio-oil of required quality, manually 10 minutes are stirred to eliminate the bubble that bio-oil seethes with excitement and wherein steam gasification is formed by Glass rod；Then, the rice hull ash of required quality was tentatively admixed in 3 minutes under the stirring of Glass rod modified pitch system；Subsequently, homogenizer first use at a slow speed (1000r/s) to stir 5 minutes, then use quickly (3000r/s) to stir 15 minutes；Finally, Glass rod stirring within 5 minutes, i.e. can get bio-oil-rice hull ash composite modified asphalt.

Embodiment 1: press domestic AH70 Colophonium 1 mass parts, rice hull ash 1% mass parts configuration modified pitch.The performance test results is shown in performance and function test part.

Embodiment 2: press domestic AH70 Colophonium 1 mass parts, bio-oil 20% mass parts configuration modified pitch.The performance test results is shown in performance and function test part.

Embodiment 3: press domestic AH70 Colophonium 1 mass parts, rice hull ash 1% mass parts and bio-oil 20% mass parts configuration modified pitch.The performance test results is shown in performance and function test part.

Reference example 1: press domestic AH70 Colophonium 1 mass parts, without rice hull ash and bio-oil.The performance test results is shown in performance and function test part.

The following is inventor provide the performance about above example modified pitch and function test:

One, Asphalt Penetration, softening point, ductility test

Prepare test specimen used by needle penetration, softening point, ductility test according to " Colophonium with Asphalt Mixture Experiment code " JTG E20-2011 code requirement, carry out 15 DEG C, 25 DEG C, 30 DEG C of penetration tests, softening point test and 10 DEG C, 15 DEG C of low-temperature ductilities tests.Bio-oil corresponding to embodiment 3-rice hull ash composite modified asphalt, its needle penetration, softening point, ductility test result and with matrix pitch, single rice hull ash or bio oil modified pitch contrast situation as shown in Figure 1 and Figure 2.

Can be obtained as drawn a conclusion by above needle penetration, softening point and ductility test result:

(1) embodiment 3 (bio-oil-rice hull ash modified pitch) relatively embodiment 2 (identical volume bio oil modified pitch) high-temperature behavior significantly improves；

(2) embodiment 3 (bio-oil-rice hull ash modified pitch) relatively embodiment 1 (identical volume rice hull ash modified pitch) low-temperature cracking-resistance is greatly improved；Compared with reference example 1 (matrix pitch), on the premise of meeting cryogenic property, high-temperature behavior increases.

Two, dynamic shear rheological (DSR) test

Use U.S. TA company to produce AR2000 type dynamic shear rheometer and carry out embodiment 1,8,11 and the PG classification test of reference example 1 and 40 DEG C, 50 DEG C, 60 DEG C, frequency scanning test in the range of 0.1rad/s～100rad/s at 70 DEG C, select 25mm fixture, asphalt membrane thickness 1mm.Result of the test is as shown in Fig. 3～Fig. 6.

From above result of the test, the overall mechanical property of embodiment 3 (bio oil-rice hull ash modified pitch) relatively embodiment 2 (the bio oil modified pitch of identical volume) and non-deformability increase, but change phase angle little；Compared with reference example 1 (matrix pitch), embodiment 1 (rice hull ash modified pitch) and embodiment 2, embodiment 3 has best anti-fatigue performance, and the energy loss of embodiment 1 is most, and anti-fatigue performance is the most bad.And in the high temperatures typical range 40 degrees Celsius～60 degrees Celsius of bituminous engineering construction thing, embodiment 3 (bio oil-rice hull ash modified pitch) high temperature rutting resistance is better than the bio oil modified pitch (embodiment 2) of matrix pitch (reference example 1) and identical volume.

Claims

1. biomass heavy oil and rice hull ash combine the application as asphalt modifier.

2. a modified pitch, it is characterised in that this modified pitch includes Colophonium, rice hull ash, biomass weight Oil.

3. modified pitch as claimed in claim 2, it is characterised in that this modified pitch includes 1 mass parts Colophonium, 0.01 mass parts rice hull ash and 0.2 mass parts biomass heavy oil.