WO2021063017A1 - 一种评价沥青混合料沥青用量的试验方法 - Google Patents
一种评价沥青混合料沥青用量的试验方法 Download PDFInfo
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- G01N33/42—Road-making materials
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- the invention relates to the technical field of asphalt, and in particular to a test method for evaluating the asphalt consumption of an asphalt mixture.
- the asphalt dosage of asphalt mixture there are two calculation methods for the asphalt dosage of asphalt mixture.
- One is the calculation of asphalt oil film thickness
- the specific surface area is calculated according to the composition gradation of the mixture
- the asphalt dosage threshold is calculated according to the empirical asphalt oil film thickness
- the other is the powder-binder ratio calculation.
- the powder-to-rubber ratio is specified in the range of 0.6 to 1.6.
- the asphalt dosage threshold calculated based on the thickness of an asphalt oil film due to the different aggregate density and water absorption, the oil film thickness itself is also an empirical value.
- the use of multiple variables and fuzzy values to determine the asphalt dosage threshold has no limitations.
- the purpose of the present invention is to solve the shortcomings in the prior art, and proposes a test method for evaluating the asphalt content of the asphalt mixture.
- a test method for evaluating the amount of asphalt in an asphalt mixture including the following steps:
- the aggregate, mineral powder, asphalt, fiber stabilizer, etc. are mixed with a small asphalt mixture mixer according to the method of T0702, and the fiber stabilizer is in the coarse and fine aggregates during mixing.
- the test shall be carried out at least 3 times in parallel, and then the average value shall be taken as the test result.
- the leakage test box has heating and constant temperature functions, a built-in open rotating cylinder, automatically records the number of revolutions, and automatically stops after rotating to the set number of revolutions, and the range of the leak test box is from room temperature to 300°C, its temperature control accuracy is ⁇ 1°C.
- the leakage test cylinder is installed in the open rotating cylinder of the asphalt mixture rotating leakage test box, fixed by elastic clips, and can be transported together with the rotating cylinder.
- the range of the balance is greater than 3000g, and the sensitivity of the balance is not greater than 0.01g.
- m 0 is the mass of the leakage test cylinder (g)
- m 1 is the total mass (g) of the leakage test cylinder and the sample
- m 2 is the leakage test cylinder and the asphalt on the leakage test cylinder.
- the total mass (g) of binder, fine aggregate, mastic, etc., ⁇ m is asphalt leakage loss (%).
- the test method of the present invention puts a certain amount of asphalt mixture into the test device, keeps it at a specified temperature for a certain period of time, transfers the specified number of times at a specified transfer rate, pours out the asphalt mixture, and determines the leakage of asphalt in the drum
- the quality and percentage are used to detect the amount of excess free asphalt precipitated from the asphalt mixture under high temperature conditions for inspection.
- Asphalt mastic macadam mixture (SMA), drainage large void asphalt mixture (OGFC) Or the maximum amount of asphalt for asphalt macadam mixtures.
- the test method of the present invention can accurately and quantitatively evaluate the amount of asphalt mixture, avoiding too small amount of asphalt mixture to affect the durability of the pavement, and avoiding excessive amount of asphalt causing leakage and oil flooding.
- Figure 1 is a schematic diagram of the experimental principle of a leak test machine for a test method for evaluating the amount of asphalt in an asphalt mixture proposed by the present invention
- a test method for evaluating the amount of asphalt in an asphalt mixture is characterized in that it includes the following steps:
- leak test box has heating and constant temperature function, built-in open rotating cylinder, automatic Record the number of revolutions and automatically stop after rotating to the set number of revolutions.
- the range of the leak test chamber is from room temperature to 300°C, and its temperature control accuracy is ⁇ 1°C.
- the leakage test cylinder is installed in the open rotating cylinder of the asphalt mixture rotating leakage test box, fixed by elastic clips, and can be transported together with the rotating cylinder.
- the range of the balance is greater than 3000g, and the sensitivity of the balance is not greater than 0.01g;
- the aggregate, mineral powder, asphalt, fiber stabilizer, etc. are mixed with a small asphalt mixture mixer according to the method of T0702, and the fiber stabilizer is in the coarse and fine aggregates during mixing.
- the test shall be carried out at least 3 times in parallel, and then the average value shall be taken as the test result.
- the test method of the present invention puts a certain amount of asphalt mixture into the test device, keeps it at a specified temperature for a certain period of time, transfers the specified number of times at a specified transfer rate, pours out the asphalt mixture, and determines the leakage of asphalt in the drum
- the quality and percentage are used to detect the amount of excess free asphalt precipitated from the asphalt mixture under high temperature conditions for inspection.
- Asphalt mastic macadam mixture (SMA), drainage large void asphalt mixture (OGFC) Or the maximum amount of asphalt for asphalt macadam mixtures.
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Abstract
一种评价沥青混合料沥青用量的试验方法,包括以下步骤:S1、准备析漏试验机、析漏试筒、玻璃板、小型沥青混合料拌和机、手铲、天平和棉纱实验工具;S2、按沥青等粘温度试验,确定拌和温度进行析漏试验;S3、在洗净、烘干的析漏试筒中,称取析漏试筒质量m0,准确至0.01g,放入试验箱进行恒温,恒温时间不少于2小时;S4、根据实际使用的沥青混合料的配合比,对集料、矿粉、沥青、纤维稳定剂等按照T0702的方法用小型沥青混合料拌和机拌和混合料,拌和时纤维稳定剂在粗细集料加入后加入。该试验方法可较准确定量评价出沥青混合料沥青用量的大小,避免沥青混合料用量过小影响路面的耐久性,也避免沥青用量过大造成析漏、泛油。
Description
本发明涉及沥青技术领域,尤其涉及一种评价沥青混合料沥青用量的试验方法。
目前,在沥青混合料的沥青用量上有两个计算方法一是沥青油膜厚度计算,按混合料组成级配,计算比表面积,按经验的沥青油膜厚度计算沥青用量阈值,二是粉胶比计算,沥青混合料中,0.075mm筛孔通过率与沥青用量的比值,在Suppaper设计方法中,规定了粉胶比0.6~1.6。
但是按一沥青油膜厚度计算出的沥青用量阈值,由于集料密度不同、吸水率不同,油膜厚度本身也是经验值,采用多种变量和模糊数值确定沥青用量的阈值,本身存在不局限性。
按二“粉胶比”来作为评判的依据之一,也是不科学的,粉胶比范围太宽范,且沥青混合料的用油用与集料自身物理特性、级配组合有很大关系,粉胶比不能反应这些性质,存在局限性,为此,我们提出了一种评价沥青混合料沥青用量的试验方法来解决上述问题。
发明内容
本发明的目的是为了解决现有技术中存在的缺点,而提出的一种评价沥青混合料沥青用量的试验方法。
为了实现上述目的,本发明采用了如下技术方案:
一种评价沥青混合料沥青用量的试验方法,包括以下步骤:
S1、准备析漏试验机、析漏试筒、玻璃板、小型沥青混合料拌和机、手铲、天平和棉纱实验工具;
S2、按沥青等粘温度试验,确定拌和温度进行析漏试验;
S3、在洗净、烘干的析漏试筒中,称取析漏试筒m
0,准确至0.01g,放入试验箱进行恒温,恒温时间不少于2小时;
S4、根据实际使用的沥青混合料的配合比,对集料、矿粉、沥青、纤维稳定剂等按照T0702的方法用小型沥青混合料拌和机拌和混合料,拌和时纤维稳定剂在粗细集料加入后加入,并适当干拌分散,再加入沥青拌和至均匀,每次拌和只能拌和一个试件,一组试件分别拌和4份,每1份约为1kg,第1锅拌和后即予废弃不用,使拌和锅黏附一定量的沥青结合料,以免影响后续3个试样油石比的准确性,当为施工质量检验时,直接从拌和机中取样;
S5、将拌制的沥青混合料装入析漏试筒内,称取析漏试筒及混合料的总质量m
1,准确至0.01g,将析漏试筒装入试验箱旋转笼内进行固定,并在试验箱设定恒温环境下,静置2小时。
S6、启动试验箱,以30r/min的旋转速率,匀速旋转至1000r停止;
S7、取出析漏试筒,不加任何冲击或振动,将混合料向下倒扣在玻璃板上,利用手铲棉纱等将混合料放置到天平上,称取析漏试筒以及黏附在析漏试筒上的沥青结合料、细集料、玛蹄脂等的总质量m
2,准确至0.01g;
S9、试验至少进行平行试验3次,然后取平均值作为试验结果。
优选地,所述S1中,析漏试验箱具有加热和恒温功能,内置敞口旋转筒,自动记录转运转数,并旋转至设定转数后自动停止,析漏试验箱的量程为室温至300℃,其控温精度为±1℃。
优选地,所述S1中,析漏试筒安装于沥青混合料旋转析漏试验箱的敞口旋转筒内,通过弹性夹片固定,可随旋转筒一起转运。
优选地,所述S1中,天平的量程大于3000g,天平的感量不大于0.01g。
优选地,所述S8中,m
0为析漏试筒质量(g),m
1为析漏试筒及试样总质量(g),m
2为析漏试筒及析漏试筒上沥青结合料、细集料、玛蹄脂等总质量(g),Δm为沥青析漏损失(%)。
本发明的试验方法将一定量的沥青混合料放入试验装置中,在规定的温度下保温一定时间,以规定的转运速率转运规定的次数,倒出沥青混合料,测定滚筒内沥青析漏的质量及百分比,用以检测沥青结合料在高温状态下从沥青混合料中析出多余的自由沥青数量,供进行检验沥青玛蹄脂碎石混合料(SMA)、排水式大空隙沥青混合料(OGFC)或沥青碎石类混合料的最大沥青用量时使用。
本发明的试验方法,可较准确定量评价出沥青混合料沥青用量的大小,避免沥青混合料用量过小影响路面的耐久性,也避免沥青用量过大造成析漏、泛油。
图1为本发明提出的一种评价沥青混合料沥青用量的试验方法的析漏试验机实验原理图;
下面将结合本发明实施例中的附图,对本发明实施例中的技术方案进行清楚、完整地描述,显然,所描述的实施例仅仅是本发明一部分实施例,而不是全部的实施例。
参照图1,一种评价沥青混合料沥青用量的试验方法,其特征在于,包括以下步骤:
S1、准备析漏试验机、析漏试筒、玻璃板、小型沥青混合料拌和机、手铲、天平和棉纱实验工具,其中析漏试验箱具有加热和恒温功能,内置敞口旋转筒,自动记录转运转数,并旋转至设定转数后自动停止,析漏试验箱的量程为室温至300℃,其控温精度为±1℃。
其中析漏试筒安装于沥青混合料旋转析漏试验箱的敞口旋转筒内,通过弹性夹片固定,可随旋转筒一起转运,天平的量程大于3000g,天平的感量不大于0.01g;
S2、按沥青等粘温度试验,确定拌和温度进行析漏试验;
S3、在洗净、烘干的析漏试筒中,称取析漏试筒m
0,准确至0.01g,放入试验箱进行恒温,恒温时间不少于2小时;
S4、根据实际使用的沥青混合料的配合比,对集料、矿粉、沥青、纤维稳定剂等按照T0702的方法用小型沥青混合料拌和机拌和混合料,拌和时纤维稳定剂在粗细集料加入后加入,并适当干拌分散,再加入沥青拌和至均匀,每次拌和只能拌和一个试件,一组试件分别拌 和4份,每1份约为1kg,第1锅拌和后即予废弃不用,使拌和锅黏附一定量的沥青结合料,以免影响后续3个试样油石比的准确性,当为施工质量检验时,直接从拌和机中取样;
S5、将拌制的沥青混合料装入析漏试筒内,称取析漏试筒及混合料的总质量m
1,准确至0.01g,将析漏试筒装入试验箱旋转笼内进行固定,并在试验箱设定恒温环境下,静置2小时。
S6、启动试验箱,以30r/min的旋转速率,匀速旋转至1000r停止;
S7、取出析漏试筒,不加任何冲击或振动,将混合料向下倒扣在玻璃板上,利用手铲棉纱等将混合料放置到天平上,称取析漏试筒以及黏附在析漏试筒上的沥青结合料、细集料、玛蹄脂等的总质量m
2,准确至0.01g;
S9、试验至少进行平行试验3次,然后取平均值作为试验结果。
本方法的简要步骤为:
a将试验箱调温至规定温度,并恒温2小时;
b、沥青混合料拌合好后,立即称取一定质量代表性沥青混合料,装入析漏试筒内,在规定温度下恒温2h;
c、将析漏试筒置于析漏试验箱的敞口旋转筒内,开始旋转试验;
d、取出析漏试筒,将混合料倒出,称取析漏试筒质量;
e、计算析漏沥青的质量及质量百分率。
本发明的试验方法将一定量的沥青混合料放入试验装置中,在规定的温度下保温一定时间,以规定的转运速率转运规定的次数,倒出沥青混合料,测定滚筒内沥青析漏的质量及百分比,用以检测沥青结合料在高温状态下从沥青混合料中析出多余的自由沥青数量,供进行检验沥青玛蹄脂碎石混合料(SMA)、排水式大空隙沥青混合料(OGFC)或沥青碎石类混合料的最大沥青用量时使用。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (5)
- 一种评价沥青混合料沥青用量的试验方法,其特征在于,包括以下步骤:S1、准备析漏试验机、析漏试筒、玻璃板、小型沥青混合料拌和机、手铲、天平和棉纱实验工具;S2、按沥青等粘温度试验,确定拌和温度进行析漏试验;S3、在洗净、烘干的析漏试筒中,称取析漏试筒m 0,准确至0.01g,放入试验箱进行恒温,恒温时间不少于2小时;S4、根据实际使用的沥青混合料的配合比,对集料、矿粉、沥青、纤维稳定剂等按照T0702的方法用小型沥青混合料拌和机拌和混合料,拌和时纤维稳定剂在粗细集料加入后加入,并适当干拌分散,再加入沥青拌和至均匀,每次拌和只能拌和一个试件,一组试件分别拌和4份,每1份约为1kg,第1锅拌和后即予废弃不用,使拌和锅黏附一定量的沥青结合料,以免影响后续3个试样油石比的准确性,当为施工质量检验时,直接从拌和机中取样;S5、将拌制的沥青混合料装入析漏试筒内,称取析漏试筒及混合料的总质量m 1,准确至0.01g,将析漏试筒装入试验箱旋转笼内进行固定,并在试验箱设定恒温环境下,静置2小时。S6、启动试验箱,以30r/min的旋转速率,匀速旋转至1000r停止;S7、取出析漏试筒,不加任何冲击或振动,将混合料向下倒扣在玻璃板上,利用手铲棉纱等将混合料放置到天平上,称取析漏试筒以及黏附在析漏试筒上的沥青结合料、细集料、玛蹄脂等的总质量m 2, 准确至0.01g;S9、试验至少进行平行试验3次,然后取平均值作为试验结果。
- 根据权利要求1所述的一种评价沥青混合料沥青用量的试验方法,其特征在于:所述S1中,析漏试验箱具有加热和恒温功能,内置敞口旋转筒,自动记录转运转数,并旋转至设定转数后自动停止,析漏试验箱的量程为室温至300℃,其控温精度为±1℃。
- 根据权利要求1所述的一种评价沥青混合料沥青用量的试验方法,其特征在于:所述S1中,析漏试筒安装于沥青混合料旋转析漏试验箱的敞口旋转筒内,通过弹性夹片固定,可随旋转筒一起转运。
- 根据权利要求1所述的一种评价沥青混合料沥青用量的试验方法,其特征在于:所述S1中,天平的量程大于3000g,天平的感量不大于0.01g。
- 根据权利要求1所述的一种评价沥青混合料沥青用量的试验方法,其特征在于:所述S8中,m 0为析漏试筒质量(g),m 1为析漏试筒及试样总质量(g),m 2为析漏试筒及析漏试筒上沥青结合料、细集料、玛蹄脂等总质量(g),Δm为沥青析漏损失(%)。
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