{"id":13513,"date":"2026-08-07T12:10:00","date_gmt":"2026-08-07T09:10:00","guid":{"rendered":"https:\/\/localhost\/wordpress\/?post_type=product&p=13513"},"modified":"2026-09-09T10:16:53","modified_gmt":"2026-09-09T07:16:53","slug":"soil-proctor-penetrometer","status":"publish","type":"product","link":"https:\/\/www.liyatest.com.tr\/en\/urun\/soil-proctor-penetrometer\/","title":{"rendered":"Soil Proctor Penetrometer"},"content":{"rendered":"

[vc_row][vc_column][vc_column_text css=”” woodmart_inline=”no” text_larger=”no”]<\/p>\n

What Is a Soil Proctor Penetrometer?<\/h2>\n

The Soil Proctor Penetrometer<\/strong> is a manually operated instrument used to evaluate the relationship between moisture content and penetration resistance in fine-grained soils.<\/p>\n

The device is particularly useful when penetration resistance measurements need to be compared with previously prepared moisture-density or moisture-penetration relationships. This allows laboratories and field personnel to make rapid comparative assessments of fine-grained compacted soils.<\/p>\n

The LT-S0101<\/strong> requires no electrical or hydraulic power, making it suitable for both laboratory and field applications.<\/p>\n

0\u201355 kg Spring Load System<\/h2>\n

The LT-S0101 uses a spring-loaded measuring mechanism with a range of 0 to 55 kg<\/strong>.<\/p>\n

The scale is divided into 1 kg increments<\/strong>, allowing the operator to monitor penetration resistance as the selected needle is pushed into the soil.<\/p>\n

The maximum applied load is retained and read directly on the sliding rod. This simple mechanical arrangement eliminates the need for an electronic display or external measuring unit.<\/p>\n

L\u0130YA’s English product page confirms the 0\u201355 kg spring load range and 1 kg scale subdivisions<\/strong>.<\/p>\n

Nine Interchangeable Stainless Steel Needles<\/h2>\n

The instrument is supplied with nine interchangeable stainless steel penetration needles<\/strong>.<\/p>\n

Available diameters are:<\/p>\n

    \n
  • \u00d84.52 mm<\/li>\n
  • \u00d85.23 mm<\/li>\n
  • \u00d86.40 mm<\/li>\n
  • \u00d89.07 mm<\/li>\n
  • \u00d812.83 mm<\/li>\n
  • \u00d816.54 mm<\/li>\n
  • \u00d820.22 mm<\/li>\n
  • \u00d824.79 mm<\/li>\n
  • \u00d828.55 mm<\/li>\n<\/ul>\n

    Different needle diameters provide different contact areas. This allows the operator to select a suitable needle according to the expected resistance of the soil.<\/p>\n

    Smaller needles are useful where penetration resistance is relatively high, while larger contact areas can be selected for softer material.<\/p>\n

    Moisture Content and Penetration Resistance<\/h2>\n

    The former ASTM D1558 method was developed to establish relationships between moisture content, density and penetration resistance<\/strong> in fine-grained soils.<\/p>\n

    The procedure could be used together with compaction curves prepared using ASTM D698 or ASTM D1557 methods. ASTM specifically described the technique as a rapid field method for estimating approximate soil moisture when a suitable family of moisture-penetration curves had already been prepared.<\/p>\n

    Therefore, the Soil Proctor Penetrometer does not directly measure moisture content<\/strong>.<\/p>\n

    Instead, it measures penetration resistance. The result must then be compared with previously established correlations for the soil being evaluated.<\/p>\n

    Relationship with Proctor Compaction Testing<\/h2>\n

    Proctor compaction testing determines the relationship between water content and dry unit weight.<\/p>\n

    The current ASTM D698-12(2021)<\/strong> remains active for standard-effort compaction testing, while ASTM D1557-12(2021)<\/strong> remains active for modified-effort compaction.<\/p>\n

    Penetrometer measurements can support these studies by providing an additional indication of how soil resistance changes with moisture condition.<\/p>\n

    However, penetration resistance should not be treated as a direct substitute for laboratory dry-density determination.<\/p>\n

    Limitations of the Method<\/h2>\n

    The former ASTM D1558 method specifically noted that penetration-resistance measurements may be unreliable for very dry compacted specimens and highly granular soils<\/strong>.<\/p>\n

    For this reason, the Soil Proctor Penetrometer is primarily intended for fine-grained soils<\/strong> where a useful moisture-penetration relationship can be established.<\/p>\n

    Material type, compaction effort, moisture distribution and selected needle size can all affect the measured resistance.<\/p>\n

    ASTM D1558 Standard Status<\/h2>\n

    L\u0130YA’s current product page still lists ASTM D1558<\/strong> as the standard reference.<\/p>\n

    However, ASTM officially withdrew the latest edition, ASTM D1558-10<\/strong>, in 2019<\/strong> and states that there is no replacement<\/strong>.<\/p>\n

    For this reason, the standard should not be presented on the new website as a current compliance standard. A more technically accurate description is:<\/p>\n

    Legacy ASTM Reference: ASTM D1558-10 \u2014 Withdrawn 2019, No Replacement<\/strong><\/p>\n

    Overall, the Soil Proctor Penetrometer<\/strong> provides a compact and fully mechanical solution for comparative penetration-resistance testing of fine-grained soils. Its 0\u201355 kg measuring range and nine interchangeable stainless steel needles make it suitable for laboratory and field soil evaluation.<\/p>\n

    [\/vc_column_text][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

    STANDART:\u00a0 <\/span><\/strong>ASTM D1558<\/span><\/em><\/p>\n

    LT-S0101<\/strong>\u00a0 \u00a0 \u00a0 \u00a0 \u00a0Soil Proctor Penetrometer<\/em><\/p>\n

    LT-S0101\/1<\/strong>\u00a0 \u00a0 \u00a0Interchangeable Stainless Steel Needle<\/em>| \u00d84,52mm<\/em><\/p>\n

    LT-S0101\/2<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle <\/em>| \u00d85,23mm<\/em><\/p>\n

    LT-S0101\/3<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle <\/em>| \u00d86,40mm<\/em><\/p>\n

    LT-S0101\/4<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle <\/em>| \u00d89,07mm<\/em><\/p>\n

    LT-S0101\/5<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle <\/em>| \u00d812,83mm<\/em><\/p>\n

    LT-S0101\/6<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle <\/em>| \u00d816,24mm<\/em><\/p>\n

    LT-S0101\/7<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle<\/em>| \u00d820,22mm<\/em><\/p>\n

    LT-S0101\/8<\/strong>\u00a0 \u00a0 Interchangeable Stainless Steel Needle <\/em>| \u00d824,79mm <\/em><\/p>\n

    LT-S0101\/9 <\/strong>\u00a0 \u00a0Interchangeable Stainless Steel Needle<\/em>| \u00d828,55mm<\/em><\/p>\n","protected":false},"featured_media":11079,"template":"","meta":[],"product_brand":[],"product_cat":[163,161],"product_tag":[],"class_list":["post-13513","product","type-product","status-publish","has-post-thumbnail","product_cat-compacted-road-base-subbase-soil-testing","product_cat-soil","first","instock","shipping-taxable","product-type-grouped"],"yoast_head":"\nSoil Proctor Penetrometer | Fine-Grained Soil Testing | Liya Test<\/title>\n<meta name=\"description\" content=\"Soil Proctor Penetrometer for evaluating moisture content and penetration resistance relationships in fine-grained soils with nine interchangeable needles.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.liyatest.com.tr\/en\/urun\/soil-proctor-penetrometer\/\" \/>\n<meta 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