{"id":21636,"date":"2024-10-16T23:27:58","date_gmt":"2024-10-16T23:27:58","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-d4647-2006\/"},"modified":"2024-10-24T13:08:26","modified_gmt":"2024-10-24T13:08:26","slug":"astm-d4647-2006","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-d4647-2006\/","title":{"rendered":"ASTM-D4647 2006"},"content":{"rendered":"
\n Significance and Use <\/b><\/p>\n

The pinhole test provides one method of identifying the dispersive characteristics of clay soils that are to be or have been used in earth construction. The piping failures of a number of homogeneous earth dams, erosion along channel or canal banks, and rainfall erosion of earthen structures have been attributed to the colloidal erosion along cracks or other flow channels formed in masses of dispersive clay (2) <\/span> .<\/p>\n

This test method models the action of water flowing along a crack in an earth embankment. Other indirect tests, such as the double hydrometer test (Test Method D 4221), the crumb test (3, 4) <\/span> , that relates the turbidity of a cloud of suspended clay colloids as an indicator of the clay dispersivity, and chemical tests that relate the percentage of sodium to total soluble salt content of the soil are also used as indicator tests of clay dispersibility (2) <\/span> . The comparison of results from the pinhole test and other indirect tests on hundreds of samples indicates that the results of the pinhole test have the best correlation with the erosional performance of clay soils in nature.<\/p>\n

Method A and Method C of the pinhole test require the evaluation of cloudiness of effluent, final size of the pinhole, and computation of flow rates through the pinhole in order to classify the dispersive characteristics of the soil. Method B requires only the evaluation of the cloudiness of effluent and final size of the pinhole to classify the dispersive characteristics of the soil. The computation of flow rates through the pinhole in Method A serves primarily as a guide to the proper equipment and specimen performance under sequential pressures applied during the test. All methods produce similar results and any method can be used to identify dispersive clays.<\/p>\n

The use of Method A or Method C results in the accumulation of data relative to sequential flow rates through the pinhole and consequent enlargement or erosion of the hole. The pinhole erosion test was developed for the purpose of identifying dispersive soils and is not intended to be a geometrically scaled model of a prototype structure. Since the theory of similitude was not used in the design of the pinhole test, quantitative data are not obtained. The quantity of flow through the pinhole, amount of soil erosion, or the rate of soil erosion should not be extrapolated to actual field conditions (3) <\/span> . However, such data may be useful in performing qualitative evaluations of the consequences of such erosion in terms of dam failure, loss of life and property. They also may be used in considering the cost effectiveness of defensive design measures necessary to minimize the effects of failure due to dispersive clays. For example, the amount of colloidal erosion that will occur in a soil classed as ND2 (very slightly dispersive) will be very small for a relatively long period of time. Such erosion may not be significant in evaluating the cost-benefit relationships in projects where public safety is not involved or where normal maintenance procedures will handle the problem. In such cases, classifying the soil as ND (nondispersive) using Method B of the pinhole test should be adequate.<\/p>\n

Pinhole tests that result in classifying soil as slightly dispersive (ND3 by Method A or Method C or SD by Method B) indicate high uncertainty about the existence of significant problems to be considered in the design or stability of a structure. In such cases, it is advisable to resample and test a number of other soils from the same area to generate an adequate statistical sample for problem evaluation. The original slightly dispersive sample may come from an area on the edge of a more highly dispersive soil.<\/p>\n

In a few physiographic areas or geoclimatic conditions, or both, neither the pinhole test nor the other indicator tests provide consistent identification of dispersive clays (5, 6, 7) <\/span> . In such cases, the results of the tests (8, 9) <\/span> should be evaluated in terms of cost effectiveness and design judgment (7) <\/span> .<\/p>\n

For some projects, it may be desirable to perform the pinhole test using eroding fluids other than distilled water (8, 10) <\/span> . In such cases, Method A, Method B, or Method C may be used to identify the dispersive characteristics of the soil and compare the results with those obtained using distilled water.<\/p>\n

Note <\/span> 1\u2014Notwithstanding the statement on precision and bias contained in this test method: The precision of this test method is dependent on the competence of the personnel performing it, and the suitability of the equipment and facilities used. Agencies which meet the criteria of Practice D 3740 are generally considered capable of competent and objective testing. Users of this test method are cautioned that compliance with Practice D 3740 does not in itself assure reliable testing. Reliable testing depends on several factors; Practice D 3740 provides a means of evaluating some of those factors.<\/p>\n

1. Scope <\/b><\/p>\n

1.1 This test method presents a direct, qualitative measurement of the dispersibility and consequent colloidal erodibility of clay soils by causing water to flow through a small hole punched in a specimen. This test method is complemented by Test Method D 4221.<\/p>\n

1.2 This test method and the criteria for evaluating test data are based upon results of several hundred tests on samples collected from embankments, channels, and other areas where clay soils have eroded or resisted erosion in nature (1) <\/span> .<\/p>\n

1.3 Three alternative procedures for classifying the dispersibility of clay soils are provided as follows:<\/p>\n

1.3.1 Method A and Method C, adapted from Ref (1), <\/span> classify soils into six categories of dispersiveness as: dispersibility (D1, D2), slight to moderately dispersive (ND4, ND3), and nondispersive (ND2, ND1).<\/p>\n

1.3.2 Method B classifies soils into three categories of dispersiveness as: dispersibility (D), slightly dispersive (SD), and nondispersive (ND).<\/p>\n

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information only.<\/p>\n

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. <\/span><\/p>\n

2. Referenced Documents <\/b> (purchase separately) <\/i> The documents listed below are referenced within the subject standard but are not provided as part of the standard.<\/span><\/p>\n

ASTM Standards <\/b><\/p>\n

D422<\/span> Test Method for Particle-Size Analysis of Soils D653<\/span> Terminology Relating to Soil, Rock, and Contained Fluids D698<\/span> Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort (12 400 ft-lbf\/ft3 (600 kN-m\/m3)) D1193<\/span> Specification for Reagent Water D2216<\/span> Test Methods for Laboratory Determination of Water (Moisture) Content of Soil and Rock by Mass D2487<\/span> Practice for Classification of Soils for Engineering Purposes (Unified Soil Classification System) D2488<\/span> Practice for Description and Identification of Soils (Visual-Manual Procedure) D3740<\/span> Practice for Minimum Requirements for Agencies Engaged in Testing and\/or Inspection of Soil and Rock as Used in Engineering Design and Construction D4221<\/span> Test Method for Dispersive Characteristics of Clay Soil by Double Hydrometer D4318<\/span> Test Methods for Liquid Limit, Plastic Limit, and Plasticity Index of Soils D4753<\/span> Guide for Evaluating, Selecting, and Specifying Balances and Standard Masses for Use in Soil, Rock, and Construction Materials Testing D6026<\/span> Practice for Using Significant Digits in Geotechnical Data <\/p>\n

Keywords <\/b><\/p>\n

clay; clay (dispersive); collodial erodibility; dispersibility; dispersivity; dispersion; dispersive clays; erosion; pinhole ; soils; Earthwork;<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

D4647-06e1 Standard Test Method for Identification and Classification of Dispersive Clay Soils by the Pinhole Test (Redline)<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n2006<\/td>\n12<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":21637,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2637],"product_tag":[],"class_list":{"0":"post-21636","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-astm","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/21636","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/21637"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=21636"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=21636"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=21636"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}