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EN 933-9 人工砂亚甲蓝试验EN9339是欧洲标准中用于评估人工砂（如机制砂或再生砂）质量的一部分，其中亚甲蓝试验（MethyleneBlueTest,MB）是检测细集料中是否存在膨胀性粘土矿物或其他有害物质的重要方法。以下是关于EN9339中亚甲蓝试验的简要介绍：
亚甲蓝试验简介
亚甲蓝试验主要用于测定人工砂中的细颗粒成分是否含有膨胀性粘土矿物、淤泥或其他可能影响混凝土性能的有害物质。这些物质如果含量过高，可能会降低混凝土的强度和耐久性。通过亚甲蓝试验，可以定量评估细颗粒的吸附能力，从而判断其对混凝土性能的影响。
原理亚甲蓝是一种阳离子染料，能够被带负电荷的粘土颗粒吸附。试验通过向砂样悬浮液中逐步加入亚甲蓝溶液，观察溶液颜色的变化以及表面活性层的形成情况，来确定细颗粒对亚甲蓝的吸附量。最终以亚甲蓝值（MB值）表示测试结果。
测试步骤1.样品制备：从人工砂中提取一定量的细颗粒（通常为小于0.063mm的部分），并将其制成悬浮液。2.溶液配制：将亚甲蓝粉末溶解于蒸馏水中，配制成标准浓度的亚甲蓝溶液。3.滴定过程：向悬浮液中逐步加入亚甲蓝溶液，并搅拌均匀。观察溶液的颜色变化及表面活性层的形成。4.终点判定：当溶液达到稳定的蓝色色晕（持续时间至少5分钟）时，记录所加入的亚甲蓝溶液体积。5.计算MB值：根据加入的亚甲蓝溶液体积和样品质量四川某办公楼室内装饰工程安全施工组织设计p，计算MB值。
结果评价根据EN9339的规定，MB值用于判断细颗粒中有害物质的含量：如果MB值≤1.4g/kg，则认为细颗粒主要由惰性材料组成，不会对混凝土性能产生显著影响。如果MB值>1.4g/kg，则表明细颗粒中含有较多的粘土矿物或其他有害物质，需要采取进一步措施（如清洗或掺入其他材料）以改善砂的质量。
总之，EN9339标准中的亚甲蓝试验是一项简单而有效的检测手段，广泛应用于建筑行业中人工砂的质量评估与控制。
M is the mass of the test portion, in grams; V1is the total volume of dye solution added, in millilitres. A.3Record theMBpvalue to the nearest 0,1 g of er kilogram of the 0/0,125 mm fraction. A.4Test reports shall include appropriate informa n accordancewith clause10.
AnnexB(informative) Testofconformityinrelationtoa specifiedMBvalue
AnnexB(informative)
AnnexB (informative) Testof conformityinrelation toa specifiedMBvalue
A check onconformitywith a specifiedMBvalue can be carried out by making a single addition of dye solution in thefollowingmanner. If the specified MB value expressed as grams of dye per kilogram of 0/2 mm fraction is MB then the volume of dye solution to be injected at one time,V2, isgiven by thefollowingequation: V2= 1
M1 is the mass of the test portion, in grams; MBis the specified MB value, in grams of dye per kilogram of 0/2 mm fraction; is the volume of dye solution in millilitres adsorbed by any addedkaolinite.
AnnexC(normative)
C.1Prepare the10g/1 dyesolutionfollowingthe procedure given in C.1.1 to C.1.7. C.1.1 Use methylene blue; (C16H1sCINgS, nH20 (n = 2 to 3) purity ≥ 98,5 %). C.1.2Determine the water contentW of the methylenebluepowder asfollows. Weigh approximately5gofmethylenebluepowder and record the mass to the nearest 0,01 g as Mh Dry this powder at (100 ± 5)°C to constant mass. Cooll in the desiccator, and then weigh immediately after taking out of the desiccator: Record the dry mass to thenearest0,01g asMg NOTEAt temperatures above 105 °℃,methylene blue powder ca bemodified. Calculate andrecord thewater contentW to the nearest decimal place from the following equation: Ma
AnnexD(normative)
NOTEA test on kaolinite of known MBg value should be carried out at regular intervals to check the constancy of results. This procedure should also be used to check a new dye solution.
AnnexE(informative)
AnnexE (informative) Exampleofatestdatasheet
E.1 Dry mass of test portion 0/2 mm (to nearest gram) M1
钢筋制作、绑扎分项工程安全交底E.2 Volume of solution adsorbed by kaolinite (if used)V
E.3Total amountof dyesolutionaddedV
MB value, expressed in grams of dye per kilogral 0/2 mm fraction (see clause 9)
ory: M= o0 V"= ml V1= ml MB=
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