Provinces, autonomous regions and municipalities directly under the central government, xinjiang production and construction corps transportation department (bureau), commission, tianjin municipal highway administration, tianjin, Shanghai municipal transport and port authority, the Yangtze river on shipping administration:

According to the road of water transportation engineering test measures for the administration of the relevant provisions of the (transportation ministry make no.12, 2005), in order to further promote the test organization ability continues to maintain, improve the quality of detection, the ministry of transport engineering quality supervision bureau (hereinafter referred to as the ministry pledges inspect bureau) in August 2013 to December, organization to carry out the national highway steel bar, the comparison test of water transportation engineering test institutions.With the approval of the ministry of transport, is presently as follows about the briefing.

First, the basic situation compared

(1)Purpose and significance.

Steel bar, is widely used in Bridges, roads, water transportation construction projects, such as its quality directly affects the engineering quality and safety, and social problems of steel bar, the quality of the products seriously.Steel under tensile strength, yield strength, break elongation test project, the most energetically; steel strand stretching force, the most strong total elongation and elastic modulus of the test items, is the necessary road water transportation engineering test organizations detection ability.

The comparison test activities designed to verify the inspection agency of metal raw material ability level, urged examination organization improve the internal management, standardized test work, promote technology and constantly improve the management level, and through careful analysis the objective factors influencing the steel bar and the detection level, for transport to perfect the related technical standards and regulations to provide data support.

(2) of the organization.

The comparative test is the ministry of transport within the industry in recent years, in view of the engineering materials to carry out the largest than activities.Activities organized by department supervision bureau, the national road and bridge quality supervision and inspection center and China communications construction supervision association test working committee to undertake together.To compare each work, set up a working group to undertake unit, responsible for the implementation of the comparative test and technical work, effectively ensuring the than the specification in order to carry out the activities.

In order to ensure the activity than fair, objective, scientific, rigorous, relevant personnel to undertake units have signed a confidentiality agreement, and in front of the comparative test sample preparation for the homogeneity test.According to the registration order, giving examination organization code, the test data statistical analysis and result evaluation, are expressed in the code.Uniformity in the scheme designing, testing, data statistical analysis and evaluation of key links such as industry, both inside and outside experts were invited.

(3) the test items and inspection agencies to compare.

1. The test items.

Steel bar mechanical properties, mechanical properties test.

2. To compare the testing institutions.

To participate in this comparison testing institutions a total of 260, including highway engineering comprehensive grade a special, bridge and tunnel engineering, water transport engineering material grade a full 141 institutions, has a steel strand extension all 40 serie b, and randomly selected comprehensive serie b with highway engineering, water transport engineering materials of 79 institutions.With steel strand detection ability of a total of 181 institutions in steel bar and 2 project, the rest of the only participate in reinforcement project.