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D345-02 – Standard Test Method Technical Guide
📐 Sampling Equipment and Preparation
The procedures outlined in ASTM D345-02 are specifically designed for the sampling of solid and liquid forms of calcium chloride used in roads and structural applications. Proper equipment and adherence to protocol are critical for obtaining a representative sample for sieve analysis or chemical testing.
The standard mandates specific apparatus for sampling. For solid-form calcium chloride, a metal sampling tube is required, measuring 25 to 40 mm in diameter with a minimum length of 500 mm. Liquid forms require a sampling bottle consistent with Practice D140. All sample containers must be glass or semi-rigid plastic with an airtight seal to preserve sample integrity from the point of collection to the time of testing.
| 🟦 Apparatus | 📏 Specification Details |
|---|---|
| Sampling Tube (Solid Form) | Metal, 25–40 mm diameter, ≥ 500 mm length |
| Sampling Container | Glass or semi-rigid plastic, airtight seal, wide mouth for solids |
| Balance | ≥ 250 g capacity, readable to 0.1 g, accurate to 0.1 g or 0.1 % |
| Test Sieves | Must conform to the requirements of Specification E11 |
⚠️ Critical Note on Analysis Methods: The referee procedure for chemical analysis is defined in Test Methods E449. While a rapid method is provided in Appendix X1, the standard explicitly states it is not to be used for determining chemical compliance with specification requirements, such as Specification D98.
⚙️ Sampling Procedures and Sieve Analysis
The standard provides distinct protocols for solid-form calcium chloride depending on the shipment type. The goal of sampling is to obtain a representative cross-section of the material. Sieve analysis is then conducted according to Test Method C136 using sieves conforming to E11 to determine the grading of the solid form.
| 🟦 Parameter | 📐 Package Shipments | 📐 Bulk Shipments |
|---|---|---|
| Sample Locations | Minimum of 3 containers selected at random | Minimum of 3 locations in the shipment |
| Surface Preparation | Scrape aside top layer ~25 mm | Scrape aside top layer ~300 mm |
| Standard Sample Size | 0.5 kg (1 lb) | From cleared surface to ≥ 50% depth |
| Penetration Depth (Bags) | Sampling tube must penetrate ≥ 300 mm | N/A |
| Small Containers | Entire contents if capacity ≤ 5 kg (10 lb) | N/A |
💡 Practical Tip: For liquid calcium chloride, sampling devices must conform to Practice D140 for Bituminous Materials. Always ensure all sample containers are sealed tightly immediately after sampling to prevent moisture absorption or contamination, which can significantly alter the test results and grading analysis.
📊 Significance of Test and Referenced Standards
ASTM D345-02 provides the definitive procedures for sampling and grading solid calcium chloride. The physical test procedure involves a sieve analysis strictly following the methods outlined in Test Method C136. This is done to compare the particle size distribution of the material against the requirements of a specification, such as Specification D98 for Calcium Chloride.
This standard relies on several key ASTM standards. Practice D140 is adapted for sampling liquid calcium chloride. Specification E11 governs the wire cloth used in the required test sieves, and Test Methods E449 provides the referee chemical analysis procedures. Understanding these interconnected standards is essential for the complete application of D345-02 in quality assurance and materials testing.
❓ Frequently Asked Questions
🔍 What is the minimum number of containers that must be sampled for solid-form calcium chloride in package shipments?
According to Section 5.1.1, a minimum of three containers must be selected at random from the shipment to constitute a representative sample.
💡 How deep must a sampling tube penetrate into a bag of calcium chloride?
For bagged solid-form calcium chloride, the sampling tube must penetrate at least 300 mm (1 ft) into the bag to ensure a representative cross-section of the material is obtained.
⚡ Is the rapid chemical analysis method in Appendix X1 acceptable for determining specification compliance?
No. The standard strictly states that the rapid method is not to be used for determining chemical compliance with specification requirements, such as Specification D98. The referee procedures in Test Methods E449 must be used for determinations of compliance.
📌 What are the specific accuracy and readability requirements for the balance used in this method?
The balance must have a capacity of at least 250 g. It must be readable to 0.1 g and accurate to either 0.1 g or 0.1 % of the test load, whichever is greater, at any point within the range of use.