AASHTO HB-17 DIVISION II SEC 24-2002 Division II Construction - Pneumatically Applied Mortar《喷浆用灰浆》.pdf
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1、Section 24 PNEUMATICALLY APPLIED MORTAR 24.1 DESCRIPTION This work shall consist of the furnishing and placing of pneumatically applied mortar for the construction of portions f structures, repairing concrete structures, texturing concrete surfaces, encasement of structural steel members, lining dit
2、ches and channels, paving slopes and for other miscellaneous work, all as shown on the This work also includes the preparation of surfaces to receive the mortar and the furnishing and placing of any reinforcing steel and anchors for reinforcement. Pneumatically applied mortar shall consist of either
3、 dry mixed fine aggregate and Portland cement pneumati- cally applied by a suitable mechanism, to which mixture the water is added immediately previous to its expulsion from the nozzle, or mortar premixed by mechanical meth- ods and pneumatically applied through a nozzle onto the prepared surface. p
4、lans. 24.2 MATERIALS 24.2.1 Cement, Aggregate, Water and Admixtures Cement, aggregate, water and admixtures, when used, shall conform to the requirements of Section 8, “Concrete Structures.” Aggregate shall be fine aggregate, except that up to 30% coarse aggregate, conforming to AASHTO M 43 for size
5、 Ys inch to No. 8 or No. 16, may be substituted for fine aggregate. Recovered rebound which is clean and free of foreign material may be reused as fine aggregate in quantities not to exceed 20% of the total fine aggregate require- ments. 24.2.2 Reinforcing Steel Reinforcing steel shall conform to th
6、e requirements of Section 9, “Reinforcing Steel.” 65 3 24.2.3 Anchor Bolts Studs Anchor studs used to support reinforcing wire fabric or bars when placing mortar against existing concrete or rock shall consist of Y4-inch minimum diameter expansion hook bolts placed in drilled holes. Each bolt shall
7、have sufficient engagement in sound masonry to resist a pull- out force of 150 lbs. When permitted by the Engineer, driven steel studs of not less than 18 inches, center to center, on vertical surfaces; and 36 inches, center to cen- ter, on top horizontal surfaces. At least three anchors shall be us
8、ed in each individual patch area. The Engineer shall be notified in advance of the date when installation of anchor studs is to begin. The loca- tions of the studs shall be such that damage will not occur to prestressing tendons or conduits embedded in the con- crete. Unless otherwise shown or speci
9、fied, for repair work, all areas where the thickness of the mortar exceeds 1% inches shall be reinforced with a single layer of either 2 X 2-W1 XWlor3 X3-WlSXW1.5weldedwirefab- ric. For areas where the thickness of the mortar exceeds 4 inches, a single layer of wire fabric shall be used to rein- for
10、ce each 4-inch thickness of patch or fractional part thereof. All fabric shall be placed parallel to the proposed finished surface. Each layer of fabric shall be completely encased in mortar which has taken its initial set, before the succeeding layer of fabric is installed. Fabric supported adjacen
11、t to the prepared masonry surface shall be no closer than YZ inch to said surface. Fabric shall be carefully prebent before installation to fit around corners and into re-entrant angles, and shall in no case be sprung into place. All steel items, including anchors, reinforcing bars and wire fabric,
12、shall be no closer than 1 inch to the finished surface of the mortar. 24.5.2 Placement of Mortar Only experienced foremen, gunmen, nozzlemen, and rodmen shall be employed, and satisfactory evidence of such experience shall be furnished when requested by the Engineer. The mortar shall be applied by p
13、neumatic equipment that sprays the mix onto the prepared surface at a high velocity as needed to produce a compacted dense homo- geneous mass. The air compressor and delivery hose lines shall be of adequate capacity and size to provide a mini- mum pressure of 35 psi at the nozzle for 1-inch nozzles
14、and proportionally greater for larger nozzles. The veloc- ity of the material as it leaves the nozzle must be main- tained uniform at a rate determined for the given job con- ditions to produce minimum rebound. Water which is added at the nozzle shall be supplied at a uniform pressure of not less th
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