251-2015水利水电工程天然建筑材料勘察规程（英文版）

　　In accordance with the plan for formulation and revision of water technical standards and the requirements of SL 1-2014 Specification for the Drafiting o f Technical Standards of Water Resources， SL 251-2000 Code for Investigation of Natural Construction Materiats for Water and Hydropower Projects has been revised and adjusted.This code includes 8 chapters and 4 annexes with the main contents as follows：-Extent and basic principles for investigation of natural construction materials.-Requirements of investigation， sampling and testing，and quality indices for various natural construction materials，including sand and gravel materials， soil materials， rock materials， usable materials from excavations， land fillmaterials， hydraulic fill materials and impervious rolled-mudstone materials.-Processing，analysis and reporting of investigation results of natural construction materials.-Identification of alkali reactivity potential of concrete aggregate， particle-size classification of soils， discriminating criteria of dispersive soil， and common form of tables for natural construction materials investigation.

暂缺《251-2015水利水电工程天然建筑材料勘察规程（英文版）》作者简介

Introduction to English Version
Foreword
1 General Provisions
2 Terms and Symbol
2．1 Terms
2．2 Symbol
3 Basic Stipulation
4 Investigation of Sand and Gravel Materials
4．1 General Requirement
4．2 Investigation
4．3 Quality Assessment
5 Investigation of Soil Materials
5．1 General Requirement
5．2 Investigation
5．3 Quality Assessment
6 Investigation of Rock Materials
6．1 General Requirement
6．2 Investigation
6．3 Quality Assessment
7 Investigation of Other Materials
7．1 Usable Materials from Project Excavation
7．2 Land Fill Materials
7．3 Hydraulic Fili Materials
7．4 Impervious Rolled - mudstone Materials
8 Data Processing and Reporting
8．1 General Requirement
8．2 Data Processing
8．3 Reporting
Annex A Identification of Alkali Reactivity
Potential of Concrete Aggregate
Annex B Particle-size Classification of Soil
Annex C Discriminating Criteria of Dispersive Soil
Annex D Common Form of Tables for Natural
Construction Materials Investigation
Explanation of Wording