CN108152164A - 一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法 - Google Patents

一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法 Download PDF

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CN108152164A
CN108152164A CN201711183857.1A CN201711183857A CN108152164A CN 108152164 A CN108152164 A CN 108152164A CN 201711183857 A CN201711183857 A CN 201711183857A CN 108152164 A CN108152164 A CN 108152164A
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water absorption
absorption rate
waste
mortar
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徐世法
索智
段文志
郭峰
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Beijing University of Civil Engineering and Architecture
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • 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
    • G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
    • G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/16—Waste materials; Refuse from building or ceramic industry
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    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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Abstract

本发明涉及一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法属于交通土建工程领域，本方法主要评价再生二灰旧粗集料的吸水率，以2.36mm为粗细料的分界筛孔。针对废旧基层材料的性能评价研究不多，主要是参照新集料的试验方法进行评价。对于废旧建筑材料，由于其中的水泥砂浆强度较高，破碎成骨料后参照新集料的试验规程评价是没有问题的。但是废旧基层材料中的胶结料用量有限，砂浆主要是裹附在集料表面。裹附的砂浆对再生骨料的吸水率有很大影响，因此对废旧基层材料表面裹附的砂浆含量进行评价。

Description

一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法
技术领域
本发明属于交通土建工程领域，具体涉及一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法。
背景技术
目前对于废旧基层材料的性能评价研究不多，主要是参照新集料的试验方法进行评价。对于废旧建筑材料，由于其中的水泥砂浆强度较高，破碎成骨料后参照新集料的试验规程评价是没有问题的。但是废旧基层材料中的胶结料用量有限，砂浆主要是裹附在集料表面。裹附的砂浆对再生骨料的吸水率有很大影响，进而对再生基层材料的性能也会产生很大影响，因此有必要对废旧基层材料表面裹附的砂浆含量进行评价。
于新通过击实试验确定最佳含水量和最大干密度的缺陷，然后提出了考虑集料吸水率的最佳含水量和最大干密度的理论计算公式。根据理论计算原理，对杭长高速的2个路面合同段水泥稳定碎石基层，进行了最佳含水量和最大干密度的理论计算，结果表明集料的吸水率对混合料的最佳含水量和最大干密度有重要的影响。
郭远新通过采用物理强化、化学强化和复合强化工艺对再生粗集料进行强化处理，并对比国内外研究数据重点分析了不同强化工艺对再生粗集料吸水率的影响。研究表明，强化工艺的选择对再生粗集料的吸水率有着很大的影响。
杨瑞华研究了集料吸水率对沥青混合料最佳油石比的影响，通过采用正交试验方法分析集料吸水率、纤维用量、水泥掺量及成型温度这4个因素对沥青混合料最佳油石比的影响程度。试验结果表明：在4个因素中,纤维用量对沥青混合料最佳油石比的影响最大，而集料吸水率的影响有所减弱。
发明内容
目前对于废旧基层材料的性能评价研究不多，主要是参照新集料的试验方法进行评价。对于废旧建筑材料，由于其中的水泥砂浆强度较高，破碎成骨料后参照新集料的试验规程评价是没有问题的。但是废旧基层材料中的胶结料用量有限，砂浆主要是裹附在集料表面。裹附的砂浆对再生骨料的吸水率有很大影响，进而对再生基层材料的性能也会产生很大影响，因此有必要对废旧基层材料表面裹附的砂浆含量进行评价。
为了评价水稳碎石旧料和二灰碎石旧料表面裹附的砂浆含量，计算了2.36mm以上不同粒径粗集料的表干吸水率：表干吸水率＝(表干重-干重)/干重。在表干吸水率的基础上用水稳旧料和二灰旧料的表干吸水率减去相同粒径的新集料的吸水率，得到表面裹附砂浆部分的吸水率。由于不同粒径的水稳或二灰旧料表面裹附的砂浆是相同的，砂浆吸水率的大小可以间接表现不同粒径旧料表面裹附的砂浆多少。按照先后顺序包括以下步骤：
将铣刨的二灰旧料过筛，粗细集料分界筛孔为2.36mm，将旧料分为2.36mm-4.75mm、4.75mm-9.5mm、9.5mm-13.2mm、13.2-19mm、19mm-26.5mm及以上若干档集料；
取试样置于盛水的容器中，使水面高于试样表面5mm左右，24h后从水中取出试样，并用拧干的湿毛巾将颗粒表面的水分轻轻试干，放在浅盘中称重。
将饱和面干试样置于105℃±5℃的烘箱中烘干至恒重，然后取出，放入带盖的容器中冷却1h以上，称量烘干质量；
粗集料的表干吸水率：
在表干吸水率的基础上用二灰旧料的表干吸水率减去相同粒径的新集料的吸水率，得到表面裹附砂浆部分的吸水率。
附图说明
图1为表干密度随粒径变化；
图2为表观密度随粒径变化；
图3为毛体积密度随粒径变化；
图4为裹附粉尘含量随粒径变化；
图5为不同材料不同粒径的表干吸水率；
图6为不同粒径旧料砂浆部分吸水率。
具体实施方式
以下结合具体实例对本发明做进一步说明，但本发明的内容不仅仅局限于下面的实施例。
本方法所采用的废旧基层材料包括取自京港澳高速河南驻信段的废旧水泥稳定碎石材料、取自北京某石料厂闲置堆放的废旧二灰稳定碎石材料和0-5mm、5-10mm和10-20mm三档石灰岩新料。
采用网篮法对不同粒径粗集料的密度进行了测定，采用容量瓶法对细集料的密度进行了测定。不同粒径的水稳碎石旧料、二灰碎石旧料和石灰岩新料的对比分析如图1-4所示。
通过图1-4发现不同粒径的水稳碎石旧料的表观密度接近石灰岩新料的表观密度，但是0-2.36mm的细集料的表观密度相对于石灰岩新料出现了明显的下降，说明水稳碎石旧料和石灰岩新料的细集料间差异更为明显。不同粒径的二灰碎石旧料密度都略小于新集料，且差值没有明显变化，说明不同粒径的二灰碎石旧料和不同粒径的石灰岩新料之间差异程度相同。石灰岩新料和二灰碎石旧料粗集料的表干密度、毛体积密度都随粒径增大而呈增加趋势，而水稳碎石旧料粗集料的表干密度、毛体积密度随粒径增大变化不大。不同粒径的粗集料表干密度和毛体积密度都是石灰岩新料>水稳碎石旧料>二灰碎石旧料。在裹附的粉尘含量方面，三种材料基本呈现随粒径增大而下降的趋势，二灰碎石旧料和水稳碎石旧料裹附的粉尘含量随粒径增大先下降然后略微上升，而石灰岩新料9.5mm以上裹附的粉尘含量基本相同。不同粒径之间裹附的粉尘含量相差最大的是二灰碎石旧料，其次是石灰岩新料，再次是水稳碎石旧料，原因可能是因为水泥砂浆的粘附作用强于二灰砂浆。
不同材料不同粒径的表干吸水率和砂浆部分吸水率随粒径的变化情况如图5和图6所示。
由图5和图6可知二灰旧料表面裹附的砂浆含量由2.36mm-13.2mm随粒径增大而减小，粒径由13.2mm-26.5mm范围内的集料随粒径增大裹附的砂浆含量基本保持不变；水稳旧料不同粒径颗粒之间裹附的砂浆含量基本相同。
通过以上的综合分析发现，水稳旧料、二灰旧料和新集料之间存在一定差异，相同材料不同粒径之间也存在一定差异，这些差异主要体现在级配、密度、棱角性、强度等方面，这些差异可能会对再生半刚性基层材料的性能具有一定影响。

Claims (2)

1.一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法，其特征是：根据规范T0307—2005方法测定集料吸水率；
2.根据权利要求说明所述一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法，其操作步骤为：
[001]将铣刨的二灰旧料过筛，粗细集料分界筛孔为2.36mm，将旧料分为2.36mm-4.75mm、4.75mm-9.5mm、9.5mm-13.2mm、13.2-19mm、19mm-26.5mm及以上若干档集料；
[002]取试样置于盛水的容器中，使水面高于试样表面5mm左右，24h后从水中取出试样，并用拧干的湿毛巾将颗粒表面的水分轻轻试干，放在浅盘中称重；
[003]将饱和面干试样置于105℃±5℃的烘箱中烘干至恒重，然后取出，放入带盖的容器中冷却1h以上，称量烘干质量；
[004]
[005]在表干吸水率的基础上用二灰旧料的表干吸水率减去相同粒径的新集料的吸水率，得到表面裹附砂浆部分的吸水率。
CN201711183857.1A 2017-11-23 2017-11-23 一种关于废旧石灰、粉煤灰稳定碎石吸水率的快速评价方法 Withdrawn CN108152164A (zh)

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* Cited by examiner, † Cited by third party
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CN113218805A (zh) * 2021-05-31 2021-08-06 湖南省交通科学研究院有限公司 一种建筑垃圾再生粗集料的评估检测及分类方法

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Application publication date: 20180612