SL 125-2017 in English

VALID

Calibration Method of Cement Mortar moulds

Issued on:2017-03-08
Implemented on:2017-06-08
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $180.00
$175.00

Standard No:	SL 125-2017
Document status:	VALID
Title in English:	Calibration Method of Cement Mortar moulds
Title in Chinese:	水泥胶砂试模校验方法
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2017-03-08
Implemented on:	2017-06-08
Superseding:	SL 125-1995 Test method for cement mortar test-molds
Professional Classification:	SL-Water Resources
Related Keywords:	cement mortar moulds introduction standard revision background calibration method verification items allowable error depth gauge verticality error ≤0.3′ class square ruler standardized verification implementation process environmental control
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Introduction

Standard Revision Background and Technological Evolution

This standard replaces SL 125-95 version and is mainly revised with reference to JJF 1071-2010 and GB/T 1.1-2009. The core changes include:

Technical indicators	SL 125-95 requirements	SL 125-2017 requirements	Precision improvement
Flatness error	≤0.05% edge length	≤0.02%	150%
Roughness Ra	Not specified	≤1.6μm	New indicators
Cavity length error (manufacturing)	±0.1mm	±0.8mm	Relaxed standards

Core verification technical requirements

4.1 General requirements

Nameplate information integrity: must include 5 basic information such as manufacturer, factory number, etc.
Assembly tightness requirements: no leakage during compaction

4.2 Metrology technical requirements

Typical case: A testing agency found that the mass of the test mold exceeded the standard by 0.3kg. After investigation, it was found that the weight increase was caused by rust on the partition. According to the standard, it was determined to be unqualified.

Verification items	Allowable error	Measuring instruments
Cavity depth (after use)	-0.3~+0.1mm	Caliper with depth gauge
Verticality error	≤0.3′	Class 0 square ruler

Standardized verification implementation process

Environmental control:Maintain a constant temperature environment of (20±5)℃, and keep the instrument isothermal for ≥2 hours
Flatness verification:Use a 150mm blade ruler and a 0.03mm feeler gauge
Cavity dimension measurement: Measure 2 points for length and 3 points for width/depth
Verticality verification: Calculate the allowable feeler gauge thickness according to the formula d_max=2πLΔθ/360

Implementation suggestions and management points

Notes: Test molds with high frequency of use should have their verification cycle shortened to 3 months; test molds with leakage should be immediately deactivated and marked.

It is recommended to establish an electronic verification file, including:

Trend analysis of previous verification data
Wear records of key components
Abnormal situation handling plan

More samples: GB 50021-2001(2009) DL/T 5154-2012 DL/T 368-2010

Sample only — not a preview of SL 125-2017

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