uggs online The material on quality control of hig

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The material on quality control of highway

, The acceptance of each batch for a 60t. Less than 60t, the acceptance by an approved testing. Reinforcement of the physical properties and chemical composition of the test, if a bar does not meet the technical requirements, you should take double samples (sample) for re-examination. Then there is a failure, the acceptance of steel as unqualified. Not use substandard steel, and the report should be handled in order to prevent mixing with the other batch of. 4.2 bags of cement cement testing should be the same, with the label, the same production time, the same approach for the date of acceptance of 200t batch of cement. When less than 200t is also approved by an acceptance test. 4.3 should be the same cement bulk cement production factory of the same species over the same period, with the grade of cement to one into the plant (field) of the same serial number as a batch of cement, but the total number of not more than 500t. At the same time, but also pay attention to the validity of cement (usually 3 months, Portland cement to one month), late re-examination must be done. Continuous construction of the project test between two cement should not exceed its expiration date. 4.4 sand, gravel or pebbles testing should be the same origin, the same specifications, the same approach time to time for the 400m or the acceptance of 600t batch. 600t 400m or less, the acceptance by a batch test. 4.5 asphalt testing to the same origin, the same species, the same label, to 20t for the acceptance of a batch, when you have less than 20t acceptance by a batch test. 4.6 admixture manufacturer must have quality certificate, including: name and address, name, packaging, quality (weight), the date of manufacture, performance, and instructions for use, the use of a time before the number into the plant performance detection. 200t 4.7 to the same level of fly ash, fly ash with a batch of other plants, also by a lack of acceptance when 200t batch testing, measurement of fly ash by dry (moisture content less than 1%) the weight. 4.8 Subgrade Soil Compaction test: section of the contract should be based on the circumstances, the use of filling sand method. When the top surface of compacted layers, with no wheel tracks, the detection frequency of detection of 8:00 to 2000m, less than 2000m, at least 2 points should be detected. 5 Highway site quality control measures commonly used materials highway construction materials costs of 42 construction cost usually accounts for 30% to 50%, and reduce the cost of materials is to improve the economic efficiency of an important aspect of engineering. Therefore, the rational use of quality, quantity, range and relatively low cost of construction materials is the main guarantee of quality. According to the province's experience in highway construction management, road materials, on-site quality control measures used are as follows: 5.1 according to the construction plans and construction methods, the organization has a variety of materials approach, the overall layout by stacking different varieties and specifications materials were stacked. And ready to rain covered facilities, in particular to prevent moisture deterioration of cement, steel corrosion. 5.2 Survey the number of earth material field reserves and production,[link widoczny dla zalogowanych], transportation, and the main construction material (cement, steel, asphalt,[link widoczny dla zalogowanych], lime, gravel) at the ministerial, \insisted on talking with the data. 5.3 Improved subgrade soils (expansive soils) should be the first field investigation of soil,[link widoczny dla zalogowanych], soil classification, soil plasticity index, soil particle analysis, the natural moisture content of soil, sub-sections, or layered with a maximum dry density and optimum water content of the test and to identify heavy with soil compaction standards, good test section, drawn construction technology control targets. 5.4 used in various types of concrete structures reinforced type, number and diameter of steel, and insisted should be consistent with design documents. The technical standards should be consistent with ministerial standard, welding rod, embedded parts, the species, size and quality must meet the design requirements and specification. 5.5 Technical requirements according to the quality of highway engineering, strict engineering quality supervision, inspection and customs, and insisted on not allowed to use substandard materials, substandard prefabricated units are not allowed to install, quality of the project in the field to grasp the dynamic, timely and relevant the quality of construction hazards and preventive measures requirements. 5.6 pairs of semi-finished materials or components (culvert, precast beams,[link widoczny dla zalogowanych], cover, etc.), manufacturer supplier before ordering the product to get a certificate and test report, test samples to verify the reliability of its quality. 5.7 material storage, site material are piling up at the establishment of signage indicating the variety, origin, specifications, inspection status, in strict accordance with the \Conscientiously implement the 1SO9000 standard procedures, from start to finish in a controlled state of raw materials, and be traceable. References 1 Ash Road Embankment Design and Construction Specifications of the Ministry of Communications Highway Research Institute of Chongqing Technical Specification for Construction of Highway Subgrade 2 (with provisions stating) First Highway Engineering, Traffic
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