Urban Road Construction Control Points _5102 -

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Urban Road Construction Control Points

Task. 3 cement concrete pavement surface 3.1 3.1.1 confirmation of raw materials of cement, sand, gravel, mixing and curing water, reinforcement should be qualified and meet the design requirements. 3.1.2 The test should have the statutory qualifications issued by a laboratory test orders and cement mix stability test, sand screening test, coarse aggregate crushing value test and the steel tensile strength,[link widoczny dla zalogowanych], bending test. 3.1.3 Construction Requirements (1) before the start of the mixing space, machinery for confirmation. First,[link widoczny dla zalogowanych], before starting to measure the outcomes of the review of the grassroots; Second, according to the design surface layer thickness on the center piles and piles Surveying side, side by a pile / 5m settings, encryption settings curved section; third feed mixing site should be carried out before hardening; fourth is compulsory mixer feeding equipment calibrated according to mix, test conditions and determine the mixer with the ratio of partial adjustment. (2) pouring process the following points should be controlled: ① supervisors to stand beside the mixing process [2] - control material, Sheung Shui and stirring time, to ensure that spices evenly, according to the construction specifications random test the slump, and production of test block inspection; ② control mixture during transportation - to ensure mixture is not segregation, no bleeding, missed pulp; ③ discharge - to be balanced in the cross-sectional and longitudinal continuous discharge to ensure that mixture collapse off the uniform, uniform thickness; ④ vibration - with plug-in vibrators, plate vibrators and vibrating beam supporting the operation, asked to insert the vibrator uniform distribution,[link widoczny dla zalogowanych], no leakage vibration, plate vibrators should be criss-cross, a comprehensive vibration, and finally with vibrating beam vibration drag, drag level, low vibration cavity re-feeding, non-leveling mortar; ⑤ smooth, embossed - must grasp the opportunity to wipe the surface after mechanical grinding leveling with puree not sprinkle dry cement powder or water spray mixture of water-cement ratio changes, effect of molding, there wear and explicit phenomenon, anti-slip Engraving machines use more Picking and processing; ⑥ forming concrete curing - to master conservation time, general use refers to the soft reduction, begins when there is no trace of conservation, and pay attention to the conservation effect, strictly in accordance with regulatory requirements. (3) properly handle the construction joint. When pouring the road will inevitably lead to construction joints, expansion joints remain in the general requirements and contraction joints. Appearance of the remaining material to be removed, shall not be used in the initial working material. (4) promptly cut contraction joint, to prevent the occurrence of irregular plates. Expansion joint is designed to ensure that the provisions of shrinkage and the local press and setting time should be controlled kerf good practice through the test, they do not bite edge,[link widoczny dla zalogowanych], to be slotted, so better early than late. Enhance traffic control, to avoid an early break sheet also an important measure. (5) Details: includes longitudinal seam edge of the treatment, the plates have been poured molding should be cut flush and then pouring the adjacent edge of the plate to ensure the smooth longitudinal seam straight,[link widoczny dla zalogowanych], neat edge. Pollution has not formed when pouring plates, to ensure that the road surface clean and beautiful; timely filling contraction joints, expansion joints, to prevent water seepage and the falling hard objects; all kinds of underground pipelines to be handled carefully checked and, according to design requirements around the wellhead plus reinforcement bars to be constructed, well box installed in place in parallel with the concrete paving, to ensure the rim of the wells 121 wells with concrete slab strength of the same intensity, the same wellhead elevation and the road surface elevation. 3.2 Asphalt Concrete Surface current urban road asphalt concrete surface layer thickness generally <15cm, asphalt concrete itself can not overcome the basic strength of reflective cracking. Only by improving the basic quality and reduce the production of base crack to reduce the surface reflective cracking. Quality control on the primary analysis has been made, and to improve the quality of asphalt surface layer and the inner surface quality of the channels and control points are: (1) optimize the mix of asphalt concrete pavement, pavement layer 3 or layer 2 layer at least 1 I-dense gradation asphalt mixture and reduce the mixture of air voids and improve the fatigue resistance of asphalt pavement to reduce surface cracks; (2) requires the preparation of the scientific construction design, meticulous organization of construction and reduce the transverse joints; (3) to develop rolling program of science to improve the surface layer compaction, reduce the surface crack and improve the life of the surface layer; (4) promote the use of modified asphalt and A pavement structure, improve the crack resistance of asphalt concrete surface layer, anti-aging ability. 4 Conclusion city road construction quality supervision control is a complex task, requiring a certain degree of supervision in addition to theoretical knowledge, but also requires extensive construction experience and timely construction methods to correct the incorrect capacity, preventive measures to ensure that road works The construction quality.

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