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Subject: лещадная форма construct. Пожалуйста, помогите перевести.Лещадная форма Выражение встречается в следующем контексте: Форму зерен щебня и гравия характеризуют содержанием зерен пластинчатой (лещадной) и игловатой формы Заранее спасибо |
| Alex Nord, ни одно определение мультитрана не подходит — я все прогуглил. Kirsta, решайте сами. Термин происходит от слова «лещадь» — плоская дощечка или каменная плитка. |
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link 29.11.2022 16:14 |
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KKP89 не помогло. Вот: Flakiness Index of aggregate is the percentage by weight of aggregate particles whose least dimension is less than 0.6 of their mean dimensions. This test is applicable to aggregates having size larger than 6.3mm. To calculate the flakiness index of the given sample of aggregates, the weight of each fraction of aggregates passing and retaining on the specified set of sieves is noted first. The pieces of aggregates are made to pass through the slot of specified thickness of gauge and then they are weighed. Then the flakiness index is calculated as the total weight of material passed through various thickness gauges, expressed as a percentage of total weight of the sample gauged. Flakiness Index = [W 2 / W 1 ] x 100 Where, W 2 = Weight passed from 0.6 x d mean size W 1 = Total weight of aggregates Flakiness Index of aggregates used in road construction should be less than 15% and normally does not exceed 25%. RELEVANCE AND IMPORTANCE It is not desirable to use flaky particles in construction of roads especially in surface course. This is because when the load acts along the thin axis (along the axis of minimum moment of inertia) of the flaky flat particles then they may get broken down easily. In order to avoid such condition, the particles have to be tested for their flakiness index values to check their suitability in using for construction of roads. This the reason of the test being carried out. Table 1: Limits of Flakiness Index for different types of pavements (SOURCE: MORTH) Sl No. Type of Pavement Maximum limit of flakiness index in % 1 Bituminous carpet 30 2 (i) Bituminous / Asphaltic concrete 25 (ii) Bituminous Penetration Macadam (iii) Bituminous Surface Dressing (Single Coat, Double Coat & Precoated) (iv) Built up spray grout 3 (i) Bituminous Macadam 15 (ii) WBM base course and surface course APPARATUS REQUIRED: • A weighing balance having an accuracy in measuring of 0.1% of the weight of sample. • Metal Gauge: It consists of elongated slots of specified dimensions. The tolerance of dimensions shall be ± 0.2 mm for dimensions equal to or more than 50 mm and ± 0.1 mm for dimensions less than 50 mm. • Sieves: IS Sieves having sizes as 25 mm, 20 mm, 16 mm, 12.5 mm, 10 mm, 6.3 mm. Fig 1: Flakiness Index Gauge. COURTESY: IRICEN.GOV.IN Fig 2: Flakiness Index Metal Gauge. COURTESY: GILSON Fig 3: Set of Sieves. COURTESY: AIC- LAB EQUIPMENTS |
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