Test and detection work is an important part of highway engineering construction technology management, and it is also an indispensable main link in highway engineering construction quality control and completion acceptance evaluation. Through experiments, local raw materials can be fully utilized, and new materials, technologies and processes can be popularized and applied. It can quantitatively and scientifically evaluate the quality of various materials and components, and can reasonably control and scientifically evaluate the engineering quality. Therefore, the test and detection work will play an extremely important role in improving the project quality, reducing the project cost, promoting the technical progress of highway engineering and speeding up the project progress. In order to make manpower, material resources and financial resources receive the best social and economic benefits, it is particularly important to do a good job in the test and detection of highway engineering construction to control the engineering quality.

First, the necessity and importance of strengthening highway engineering test.

Road engineering test is an important part of engineering quality management, and it is also the main link of highway engineering quality control evaluation and acceptance. The quality of products or projects must be achieved through testing and testing. Its necessity and importance are mainly reflected in the following aspects:

1, through the test, we can make full use of local materials. Such as gravel, fillers, etc. Testing can be carried out at the construction site to determine whether the above materials meet the requirements of construction technology. It is convenient to use local materials and reduce the project cost.

2, through the test, is conducive to the popularization and application of new technologies, new processes and new materials. Timely and effectively test new materials, new technologies and new processes to determine their feasibility, applicability, effectiveness and advancement, so as to accumulate experience and lessons for engineering construction. This will also play a positive role in promoting the progress of construction technology and improving the progress and quality of the project.

3. Through necessary inspection, the quality of various raw materials, finished products and semi-finished products can be scientifically evaluated. Using effective and scientific testing methods, any material can pass the relevant tests of its specified performance, so as to evaluate whether its products are qualified. This is beneficial to the rational application of materials and the improvement of engineering quality.

4. Through the test, the construction quality can be controlled reasonably and evaluated scientifically. The quality of a project, including quality control during construction and evaluation and acceptance after completion, is undoubtedly a scientific and effective method and means.

To sum up, it can be seen that the test is conducive to improving the quality of the project, speeding up the progress of the project, reducing the cost and promoting the progress of construction technology.

Two, to further establish and improve the highway engineering quality assurance system, enhance the awareness of engineering quality.

Implement a three-level quality assurance system of "government supervision, social supervision and enterprise self-inspection". Quality management departments at all levels should take effective measures to continuously improve the quality management level according to the principle of quality first and the requirements of total quality management. In practical work, we should strictly implement quality self-inspection, strengthen quality management and supervision, and gradually establish and improve a three-level quality assurance system. Secondly, it is necessary to strengthen the quality awareness of all aspects of construction, take responsibility for the division of labor, and truly implement the quality post responsibility system.

Third, do a good job in the quality control of the site construction process.

In the process of construction, project quality control mainly includes self-inspection by the construction unit, sampling inspection by the supervision unit, and government supervision (process inspection by the quality supervision station, such as sampling inspection of raw materials). For the construction party, it is necessary to establish a relatively perfect test and detection system, establish a site laboratory, equip relevant test and detection personnel, and assign special personnel to be responsible for quality inspection, and adhere to the "self-inspection" system; For the supervisor, it is necessary to truly implement the three-layer supervision, especially the supervision in advance, so as to nip in the bud and solve it in time, make full use of the relevant test equipment in the laboratory of the supervision center, and take the test detection as an effective means to strictly control the quality, so as to achieve the purpose of controlling the construction quality; For the supervisor, in order to really play its role as a government supervision function, it is necessary to conduct timely sampling inspection, timely acceptance and evaluation, find out the engineering quality problems, solve them in time, grasp the typical examples, set an example, and safeguard the seriousness, authority and impartiality of government departments in highway engineering quality supervision.

Four, completes the partial project quality acceptance

Another important aspect of strengthening highway engineering test detection is also reflected in the quality acceptance of partial projects. The quality evaluation method of highway engineering is to divide the project into unit project, sub-project and sub-project according to the needs of construction task, construction management and quality inspection and evaluation, classify the sub-projects according to quality inspection and evaluation standards, and determine the corresponding scores of sub-projects or unit projects by using weighted average calculation method. According to the score, the project quality will be evaluated step by step according to disciplines, divisions, unit projects, contract sections and construction projects. Engineering quality grades are divided into qualified and unqualified grades (the specific grades are specified in the current highway engineering standard "Highway Engineering Quality Inspection and Evaluation Standard" (JTGF80/ 1-2004)). After the completion of the branch project, summarize the quality evaluation form of each process in time, fill in the quality evaluation form of parts, calculate the qualified rate of parts, and complete the signing formalities. All subdivisional work is qualified, then the divisional work is evaluated as qualified; Any subdivisional work is unqualified, then the subdivisional work is unqualified. After the completion of the unit project, the quality evaluation form of each part shall be summarized in time, and the quality evaluation form of the unit project shall be filled in, which shall be signed by the main technical person in charge of the construction and stamped with the official seal of the unit as one of the basis for the completion acceptance and the quality supervision department to verify the quality grade. If all sub-projects of a unit project are qualified, the unit project is assessed as qualified; Any division project is unqualified, then the unit project is unqualified. All the unit projects included in the contract section and the construction project are qualified, and the engineering quality level is qualified; The project of any subordinate unit is unqualified, then the contract section and construction project are unqualified. The results of intermediate handover acceptance directly reflect the quality of a division (project) and the problems and defects existing in the quality of the project, and are the concentrated embodiment of the construction achievements of a division (project). Therefore, for highway engineering, in addition to the quality control of the construction site, it is also necessary to conduct quality acceptance of each division (item) project in time and make a phased construction summary. For unqualified projects, resolutely rework.

Five, the post responsibility system for test personnel.

Testing personnel play an important role in the whole testing work, which is the key to the level of testing work. It can be said that the quality problems of highway construction are mostly caused by poor personnel supervision. Therefore, in view of this situation, we should implement the post responsibility system for inspectors: the post responsibility system is a major system of the laboratory, and the scope and authority of each department listed in the organization chart should be clear. The responsibilities of each department should cover all the management functions and technical functions specified in the "Evaluation Contents and Methods of Metrology Certification of Quality Inspection Institutions" to ensure that everything is under control. Determine the testing scope of testers according to the evaluation.

1. responsibilities of the director of the test and testing room: the director of the room is mainly responsible for the test and testing work, including organizing the completion of various test and testing tasks, determining the quality policy and quality objectives of testing, keeping a close grasp of the development trends and status quo of the specialty at home and abroad, and proposing new testing schemes in time according to the construction needs, so as to realize strict discipline management and professional quality management for all testing personnel in the room.

2. Job responsibilities of testing personnel: The testing work undertaken by testing personnel shall be carried out under the responsibility contract system, and each task shall be carried out by individuals. A system of who is responsible for testing shall be established, and testing personnel shall be urged to carry out various testing work in strict accordance with the testing specifications, testing outline and implementation rules to ensure the accuracy and reliability of testing data.

Six, some problems that should be paid attention to in-situ density detection

1, sand filling method is suitable for soil foundation, base and cushion. Pay attention to the granularity of sand, and be clean and even. The depth of the pit is the thickness of the whole layer (this layer is a rolled layer). The sand should be leveled and the pit wall should be vertical.

2. The sampling depth of circular knife method should exceed 1/2 layer thickness.

3. The nuclear density meter should be calibrated when it is used, and it should be recalibrated before each soil change. Due to the great influence of soil changes, the accuracy is not high, so it can only be used as a reference for quality control, not as a basis for quality evaluation.

4. Compactness of rock-filled embankment: try to control it by relative deformation between two times, and there is no other better detection method.

5. Compactness of soil-rock mixed subgrade: There is no good solution at present. It is suggested to use the relative deformation between every two times to control it.

6. Compaction degree and deflection value: When one index meets the requirements and the other index does not, it should be noted that the depth of deflection value is about 1m, and the compaction degree only reflects the compaction degree of the compacted layer, and the compaction degree only controls the strength of the compacted layer. If the fill is thin, although the compactness can not meet the requirements, the deflection value can meet the requirements.

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