1、4C67-14be tested for each 500 tons(453.6 Mg)or fraction thereof.In6.2.1 Support the test specimen flatwise unless specified andno case shall less than five tile be taken.Additional specimensreported otherwise(that is,apply the load in the direction of theare taken at the discretion of the purchaser.
2、depth of the unit)on a span approximately I in.(25.4 mm)less4.3 Identification-Each specimen shall be marked so that itthan the basic unit length and loaded at midspan.Specimensis identifiable at any time.Markings shall cover not more thanhaving recesses(panels or depressions)shall be placed so that
3、5 of the superficial area of the specimen.such recesses are on the compression side.Apply the load tothe upper surface of the specimen through a steel bearing plate4 in.(6.35 mm)in thickness and 1%in.(38.10 mm)in width5.Specimen Preparationand of a length at least equal to the width of the specimen.
4、5.1 Drying and Cooling:6.2.2 Make sure the supports for the test specimen are free5.1.1 Drying-Dry the test specimens in a ventilated oven atto rotate in the longitudinal and transverse directions of the test230 to 239F(110 to 115C)for not less than 24 h and untilspecimen and adjust them so that the
5、y will exert no force intwo successive weighings at intervals of 2 h show an incrementthese directions.of loss not greater than 0.2 of the last previously determined6.2.3 Speed of Testing-The rate of loading shall not exceedweight of the specimen.2000 Ibf(8896 N)/min.This requirement is considered a
6、s5.1.2 Cooling-After drying,cool the specimens in a dryingbeing met when the speed of the moving head of the testingroom maintained at a temperature of 75+15F(24 8C),machine immediately prior to application of the load is notwith a relative humidity between 30 and 70%.Store the unitsmore than 0.05 i
7、n.(1.27 mm)/minfree from drafts,unstacked,with separate placement,for aperiod of at least 4 h and until the surface temperature is within6.3 Calculation and Report:5F(2.8C)of the drying room temperature.Do not use6.3.1 Calculate and report the modulus of rupture of eachspecimens noticeably warm to t
8、he touch for any test requiringspecimen to the nearest 1 psi(0.01 MPa)as follows:dry units.The specimens shall be stored in the drying roomS=3W(1/2-x)/bd(1)with the required temperature and humidity maintained untilwhere:tested.Smodulus of rupture of the specimen at the plane of5.1.2.1 An alternativ
9、e method of cooling the specimens tofailure,Ib/in.(Pa),approximate room temperature is permitted as follows:StoreW=maximum load indicated by the testing machine,Ibfunits,unstacked,with separate placement,in a ventilated roomN),maintained at a temperature of 75+15F(24+8C),with adistance between the s
10、upports,in.(mm),relative humidity between 30 and 70%for a period of 4 h andb net width.(face to face minus voids).of the specimenuntil the surface temperature is within 5F(2.8C)of theat the plane of failure,in.(mm).ventilated room temperature,with a current of air from and depth.(bed surface to bed
11、surface).of the specimen atelectric fan passing over them for a period of at least 2 hours.the plane of failure,in.(mm),andThe specimens shall be stored in the ventilated room with theaverage distance from the midspan of the specimen torequired temperature and humidity maintained until tested.the pl
12、ane of failure measured in the direction of the5.2 Weight Determination:span along the centerline of the bed surface subjected to5.2.1 Weigh five full size specimens that have been driedtension,in.(mm).and cooled(see 5.1).The scale or balance used shall have a6.3.2 Calculate and report the average o
13、f the modulus ofcapacity of not less than 3000 g and shall be sensitive to 0.5 g.rupture determinations to the nearest 1 psi(0.01 MPa).5.2.2 Report results separately for each specimen to thenearest 0.1 g,with the average of all specimens tested to the7.Compressive Strengthnearest 0.1 g.7.1 Test Spe
14、cimens:5.3 Removal of Silicone Coatings from Brick Units-The7.1.1 Brick-The test specimens shall consist of half bricksilicone coatings intended to be removed by this process areunits that have been dried and cooled(see 5.1).the full heightany of the various polymeric organic silicone compounds used
15、and width of the unit,with a length equal to one half the fullfor water-resistant coatings of brick units.Heat the brick at 950length of the unit I in.(25.4 mm),except as described below.50(5l028C)in an oxidizing atmosphere for a periodWhen the test specimen,described above,exceeds the testingof not
16、 less than 3 hours.The rate of heating and cooling shallmachine capacity,the test specimens shall consist of dry piecesnot exceed 300F(149C)per hour.of brick,the full height and width of the unit,with a length notNorE 2-Additional specimen preparation requirements for specificless than one quarter o
17、f the full length of the unit,and with atests are indicated in the individual test methods.gross cross-sectional area perpendicular to bearing not lessthan 14 in.2(90.3 cm2).Test specimens shall be obtained by6.Modulus of Rupture(Flexure Test)any method that will produce,without shattering or cracki
18、ng,aspecimen with approximately plane and parallel ends.Five6.1 Test Specimens-The test specimens shall consist ofspecimens shall be tested.whole full-size units that have been dried and cooled(see 5.1).Five such specimens shall be tested.7.1.2 Structural Clay Tile-Test five tile specimens thathave been dried and cooled(see 5.1)in a bearing bed length6.2 Procedure:equal to the width 1 in.(25.4 mm);or test full-size units.ASTM Inte