Wall bricks forming a tryout

Masonry brick wall bricks forming a tryout mold and sample preparation card 1 Subject Matter and Scope This standard specifies the masonry brick size, appearance quality, bending strength and compressive strength, freeze-thaw density, lime burst, Pan cream, water absorption and saturation coefficient, porosity and pore structure, drying shrinkage, test methods carbonation. This standard applies to conglomerates and non-fired brick. Brick including sintered common brick, sintered porous and sintered hollow bricks and blocks (hereinafter referred to as hollow bricks); non-fired brick including autoclaved sand-lime brick, fly ash brick, slag bricks and carbonation brick. 2 Measure 2.1 Brick with a caliper measuring tool (Figure 1), dividing the value of 0.5mm. 2.2 Measurement length shall be separately measured in two dimensions at the middle of the two Omo bricks; width should be two sizes were measured in the middle of the two Omo bricks; height should each side of the middle of the two strips measuring two dimensions, as shown in Figure 2. When measured at a defective or projections, it can, in its next measurement, but should choose negative side. 2.3 Evaluation of results The results are to the maximum deviation length, height and width of said person by 1mm less than 1mm dollars. 3 appearance quality inspection measuring 3.1 3.1.1 brick with a caliper (Figure 1), dividing the value of 0.5mm. 3.1.2 steel ruler, indexing is 1mm. 3.2 Measurement Methods 3.2.1 Defect 3.2.1.1 missing edge off angle on the extent of damage caused by brick to the broken parts of the long, seats, and high edge of the projection size to measure, known as the damage size. As shown in Figure 3. 3.2.1.2 surface damage caused by the defect, the defect portion of the article refers to the top surface (hollow brick of Article Omo) the projected area, shown in Figure 4. Hollow brick inner walls of incomplete and missing rib size to the projector to measure the longitudinal dimension. 3.2.2 3.2.2.1 crack crack into the longitudinal direction, a width direction and a horizontal direction of three, test direction of the length of the projection, said projection length if a crack extending from one surface to another surface, which extends the accumulated, As shown in Figure 5. 3.2.2.2 porous brick when communicating hole and crack, it will be measured in the hole including crack, shown in Figure 6. 3.2.2.3 crack length were measured in three directions yesterday longest crack as the measurement result. 3.2.3 3.2.3.1 bending bent respectively Omo and strip surface measurements, the measurement will be placed bricks with a caliper limbs along the edges of the two ends, choosing the bend at the maximum vertical foot pushed to the tile surface, as shown in 7. But the recess should not be calculated due to impurities or scratches caused by account. 3.2.3.2 In greater bending test as a measurement result. 3.2.4 impurities in the impurity projection height projection surface height of the brick caused by the maximum distance from the impurity represented brick. The Brick with a caliper of both legs placed on both sides of the brick projecting plane to the vertical tape measure, shown in Figure 8. measured. Appearance measurement results processing 3.3 millimeters, less than 1mm who, by 1mm dollars. 4 bending strength and compressive strength tests show the value 4.1 Equipment 4.1.1 Materials testing machine testing machine relative error is less than ± 1%, the lower the pressure plate should be twisted ball bearings, is expected to be in the range of the maximum failure load The 20ˉ80% between. 4.1.2 flexural bending test fixture of loading in the form of three-point loading, the radius of curvature on the pressure roller and a lower support roller is 15mm, the lower branch of the roll should have a hinged fixed. 4.1.3 Preparation compression platform. Specimen preparation must be flat horizontal platform, using metal or other materials. 4.1.4 foot level specifications for 250ˉ300mm. 4.1.5 Steel ruler division value of 1mm. 4.2 flexural strength (load) test sample 4.2.1.1 Sample 4.2.1 Number: Brick and autoclaved sand-lime brick is 5, the other brick is 10. 4.2.1.2 autoclaved sand-lime brick should be placed in water at a temperature of 20 ± 5 ℃ for 24h to soak out the surface with a damp cloth wipe the moisture content in the flexural strength test. 4.2.1.3 slag, fly ash bricks and tiles in 24ˉ36h After curing within the test. 4.2.1.4 Brick flooding and other processes without directly tested. 4.2.2 Test procedure 4.2.2.1 measuring 2.2 according to a predetermined width and height dimensions of each sample 2, respectively, and the arithmetic mean, accurate to 1mm. 4.2.2.2 Adjustment roll bending jig support span length minus brick size 40mm. However, the length of 190mm brick specifications, the span is 160mm. 4.2.2.3 The sample flat on the lower Omo-rollers, both end surfaces of the sample and the distance-rollers should be the same, when the sample when there are cracks or dents, cracks or dents should make a big face-down, in order to 50ˉ150N / s analysis of loading speed even until specimen fracture, record the maximum failure load P. 4.2.3 The result of the calculation and evaluation of each bending load 4.2.3.1 porous brick sample with maximum failure load multiplied by the scale factor calculation, accurate to 0.1kN. 4.2.3.2 flexural strength Rc each sample according to equation (1) to calculate the nearest 0,1MPa. 3PL Rc = ─── .......................................... (1) 2BH2 Where: Rc-- flexural strength, MPa; P-- maximum failure load, N; L-- span , mm; B-- specimen width, mm; H-- sample height, mm. 4.2.3.3 the arithmetic average of the test results to the specimen flexural strength or bending load of a single block of minimum and said accurate to 0.1MPa or 0.1kN. Compressive strength test specimens 4.3.2.2 4.3 4.3.1 brick, hollow brick a. Perforated brick to brick monolith along the entire vertical direction pressure hole, hollow brick single brick block entire strip along the Omo and pressurized plane direction, respectively. b. specimens produced using the slurry method is to sit. About to be placed on the glass specimen preparation platform, which capped a wet pad of paper, the paper layer of a thickness of not more than 5mm with 325 or 425 ordinary portland cement made of suitable consistency of cement paste, and then soaked in water samples 10ˉ20min smooth ride on the receiving surface water, mud, face pressed a little pressure on the other, the entire receiving surface layer of cement and brick bonded with each other, brick side It should be perpendicular to the glass. After the slurry solidification appropriate, together with the glass turned on the other laying out the paper pulp put the glass, then sit pulp, with a horizontal ruler correction standards of good glass. 4.3.2.3 Non-fired brick fracture of the two half bricks stacked with a specimen contrary, the overlapping portions may not Xiaoping 100mm, shown in Figure 11. That is the compressive strength of the specimen. If less than 100mm, should be eliminated to make up the other to take alternate sample. 4.3.3 Specimen conservation 4.3.3.1 wipe test piece made of non-ventilated room should be placed not lower than 10 ℃ conservation 3d, and then tested. 4.3.3.2 Non-fired brick specimen, without curing directly tested. 4.3.4 Test procedure 4.3.4.1 Measurement connection of each specimen surface or receiving surface length and width dimensions of the two, respectively, the mean value, accurate to 1mm. 4.3.4.2 The specimen flat on the center of the pressure plate, perpendicular to the receiving surface loading should be evenly smooth, shock or vibration may not occur. Loading rate to 2ˉ6kN / s is appropriate, until the specimen damage so far, record the maximum failure load P. 4.3.5 Calculation and evaluation of results 4.3.5.1 Rp compressive strength of each sample according to equation (2) calculation, accurate to 0.1MPa. P Rp = ── ................................................ (2) LB Where: Rp-- compressive strength, MPa; P-- maximum failure load, N; L-- by pressure surface (land) in length, mm; B-- receiving surface (connection surface) width, mm. 4.3.5.2 the arithmetic average of the test results to the specimen and the compressive strength of a single block of minimum representation, accurate to 0.1MPa. 5 freeze-thaw test equipment 5.1 a cryostat or freezer: the sample into the rear box (room) temperature adjusted to below -20 ℃ or -20 ℃. b. tank holding tank temperature 10ˉ20 ℃ appropriate. c. scales, dividing the value of 5g. d. drying oven. 5.2 the number of samples and processing a. The number of samples should comply with the provisions of 4.2.1.1. The test results indicate compressive strength, the number of samples is 10. b. Use a brush to clean the surface of the sample, and the numbering sequence. 5.3 Test procedure 5.3.1 The sample was placed in a blast oven at 105ˉ110 ℃ dried to constant (during drying, weighing around twice the difference is not more than 0.2%, before and after the interval of two weights 2h), call quality G0. And check the appearance. The missing edge off angle and crack mark. 5.3.2 The sample was immersed in water 10ˉ20 ℃ and removed after 24h, wipe with a damp surface moisture to Omo lateral distance greater than 20mm stand up to a pre-cooling to below -15 ℃ freezer. 5.3.3 When the inside temperature dropped to -15 ℃ start counting again at -15ˉ-20 ℃ frozen: Brick frozen 3h; non-fired brick frozen 5h. Then out into the water 10ˉ20 ℃ melting; fired brick not less than 2h; non-fired brick less than 3h. Such as a freeze-thaw cycle. 5.3.4 every five freeze-thaw cycles, destruction checks that occur during freezing and thawing, such as the cracking, lack of edge, off angle, peeling. 5.3.5 thawing process, found frozen samples beyond the outer current regulations, should continue to test to 15 freeze-thaw cycle ends. 5.3.6 After 15 freeze-thaw cycles, check and record the sample freezing and thawing process in the cracking length, missing edge off angle and peeling destruction. 5.3.7 Sample 15 after freeze-thaw cycles, and placed in drying oven, press the provisions of 5.3.1 and dried to constant, saying the quality of G1. If you do not find lyophilized Brick phenomenon, it can not be dried weighed. 5.3.8 The sample was dried (non-fired brick and then soaked in water 10ˉ20 ℃ 24h) according to the provisions of 4.3 compressive strength test. 5.3.9 Each puzzle wall which part of the test can be carried out according to the product standards. 5.4 Results 5.4.1 Calculation and evaluation of the mass loss rate Gm according to equation (3) to calculate accurate to 0.1%: G0-G1 Gm = ──── × 100 .......................................... ( 3) G0 Where: Gm-- mass loss rate,%; dry mass of the specimen before G0-- thawing, g; G1-- sample freeze dry mass, g.