{"content":[{"text":"Lucideon Reference: \n Customer Reference: \n Description:","bbox":{"left":0.060504,"top":0.040283,"width":0.170019,"height":0.043678999999999996}},{"text":"(135405)-22969 / CR1 \n Birchover Gritstone \n Natural Stone Masonry","bbox":{"left":0.251093,"top":0.040223,"width":0.17193799999999998,"height":0.04364300000000001}},{"text":"DETERMINATION OF INITIAL SHEAR STRENGTH \n BS EN 1052-3:2002","bbox":{"left":0.304134,"top":0.109974,"width":0.392262,"height":0.030069}},{"text":"1","bbox":{"left":0.060504,"top":0.16463,"width":0.009362999999999996,"height":0.016386999999999985}},{"text":"INTRODUCTION","bbox":{"left":0.096276,"top":0.16463,"width":0.128834,"height":0.016386999999999985}},{"text":"Units of Birchover natural stone were received from the client for testing for shear strength to BS EN 1052-3: \n 2002: Methods of Test for Masonry – Part 3: Determination of Initial Shear Strength.","bbox":{"left":0.096202,"top":0.191791,"width":0.843883,"height":0.030033000000000004}},{"text":"2","bbox":{"left":0.060504,"top":0.246577,"width":0.009362999999999996,"height":0.016386999999999985}},{"text":"SAMPLES RECEIVED","bbox":{"left":0.096271,"top":0.246577,"width":0.17187600000000003,"height":0.016386999999999985}},{"text":"The units received were referenced as ‘Birchover Gritstone’ with nominal dimensions as follows; 445 x 100 x \n 142mm (Length x Width x Height).","bbox":{"left":0.096202,"top":0.273739,"width":0.843734,"height":0.030032000000000003}},{"text":"The units were solid with a natural stone face and pinkish-grey (5YR 8-1) in colour.","bbox":{"left":0.096202,"top":0.314712,"width":0.614453,"height":0.016351000000000004}},{"text":"The units were \n specimens.","bbox":{"left":0.096202,"top":0.342004,"width":0.11959100000000002,"height":0.030033000000000032}},{"text":"allowed","bbox":{"left":0.225079,"top":0.342004,"width":0.05693000000000001,"height":0.016351000000000004}},{"text":"to","bbox":{"left":0.291295,"top":0.342004,"width":0.014050000000000007,"height":0.016351000000000004}},{"text":"condition","bbox":{"left":0.314631,"top":0.342004,"width":0.06734099999999998,"height":0.016351000000000004}},{"text":"in","bbox":{"left":0.391265,"top":0.342004,"width":0.01310699999999998,"height":0.016351000000000004}},{"text":"the","bbox":{"left":0.413657,"top":0.342004,"width":0.023417999999999994,"height":0.016351000000000004}},{"text":"laboratory","bbox":{"left":0.446361,"top":0.342004,"width":0.07472900000000005,"height":0.016351000000000004}},{"text":"for","bbox":{"left":0.530319,"top":0.342004,"width":0.019662999999999986,"height":0.016351000000000004}},{"text":"at","bbox":{"left":0.559267,"top":0.342004,"width":0.014050000000000007,"height":0.016351000000000004}},{"text":"least","bbox":{"left":0.582603,"top":0.342004,"width":0.035587000000000035,"height":0.016351000000000004}},{"text":"7 days","bbox":{"left":0.627476,"top":0.342004,"width":0.05423099999999992,"height":0.016351000000000004}},{"text":"prior","bbox":{"left":0.690892,"top":0.342004,"width":0.033604999999999996,"height":0.016351000000000004}},{"text":"to","bbox":{"left":0.733782,"top":0.342004,"width":0.014050000000000007,"height":0.016351000000000004}},{"text":"construction","bbox":{"left":0.757118,"top":0.342004,"width":0.09068900000000002,"height":0.016351000000000004}},{"text":"of","bbox":{"left":0.856991,"top":0.342004,"width":0.014050000000000007,"height":0.016351000000000004}},{"text":"the","bbox":{"left":0.880327,"top":0.342004,"width":0.02341800000000005,"height":0.016351000000000004}},{"text":"test","bbox":{"left":0.913031,"top":0.342004,"width":0.02716200000000002,"height":0.016351000000000004}},{"text":"3","bbox":{"left":0.060504,"top":0.396791,"width":0.009362999999999996,"height":0.016386999999999985}},{"text":"METHOD OF CONSTRUCTION","bbox":{"left":0.096293,"top":0.396791,"width":0.24096,"height":0.016386999999999985}},{"text":"Nine stack-bonded specimens were constructed: the stack bonded specimens consist of three units stacked on \n top of each other with each course separated by a 10mm mortar bed. Following construction the specimens \n were pre-compressed by a uniform mass to give a vertical stress of nominally 3.5 x 10-3 N/mm2. The specimens \n were close covered with polythene sheets for 28 days at ambient laboratory temperatures, typically 14-18 ºC with \n a relative humidity between 60% and 75%.","bbox":{"left":0.096201,"top":0.423952,"width":0.8437910000000001,"height":0.07100699999999999}},{"text":"The specimens were cured using the prescribed method detailed in BS EN 1052-3:2002.","bbox":{"left":0.096201,"top":0.5059,"width":0.65855,"height":0.016351000000000004}},{"text":"Mortar properties of the specimens are given in Table 1.","bbox":{"left":0.096201,"top":0.533264,"width":0.41667200000000004,"height":0.016351000000000004}},{"text":"4","bbox":{"left":0.060504,"top":0.574368,"width":0.009362999999999996,"height":0.01638700000000004}},{"text":"METHOD OF TEST","bbox":{"left":0.09628,"top":0.574368,"width":0.148453,"height":0.01638700000000004}},{"text":"A specimen was placed into the testing rig such that the faces of the masonry units where the shear load is \n applied were plane and perpendicular to the direction of the load.","bbox":{"left":0.096203,"top":0.601529,"width":0.8438469999999999,"height":0.029962000000000044}},{"text":"Testing was carried in accordance with ‘Procedure A’, as detailed in clause 8.2.1 of BS EN 1052-3:2002.","bbox":{"left":0.096204,"top":0.642503,"width":0.776174,"height":0.016351000000000004}},{"text":"As the compressive strength of the supplied units was in excess of 10N/mm2, pre-compressions of 0.2, 0.6 and \n 1.0N/mm2 were applied.","bbox":{"left":0.096201,"top":0.668401,"width":0.8438990000000001,"height":0.03142800000000001}},{"text":"The loading rate was that as prescribed in the standard.","bbox":{"left":0.096203,"top":0.71077,"width":0.41484000000000004,"height":0.016351000000000004}},{"text":"5","bbox":{"left":0.060505,"top":0.751874,"width":0.009362999999999996,"height":0.01638700000000004}},{"text":"RESULTS","bbox":{"left":0.096292,"top":0.751874,"width":0.078604,"height":0.01638700000000004}},{"text":"Individual shear results are shown in Table 2. \n Appendix.","bbox":{"left":0.096201,"top":0.779035,"width":0.345243,"height":0.030032999999999976}},{"text":"A chart of shear strength versus pre-compression is given in the","bbox":{"left":0.453154,"top":0.779035,"width":0.48704699999999995,"height":0.016351000000000004}},{"text":"6","bbox":{"left":0.060503,"top":0.833822,"width":0.009362999999999996,"height":0.01638700000000004}},{"text":"SUMMARY","bbox":{"left":0.096291,"top":0.833822,"width":0.08700700000000001,"height":0.01638700000000004}},{"text":"The characteristic initial shear strength of the ‘Birchover Gritstone’ units, manufactured by Birchover, tested with \n designation (iii) mortar was 0.10N/mm2.","bbox":{"left":0.096201,"top":0.860983,"width":0.843853,"height":0.030032999999999976}},{"text":"Page 2 of 4","bbox":{"left":0.854017,"top":0.942361,"width":0.086005,"height":0.016351000000000004}}],"images_bbox":[{"left":0.696,"top":0.046033,"width":0.244119,"height":0.023587}],"images_bbox_not_text_overlap":[{"left":0.696,"top":0.046033,"width":0.244119,"height":0.023587}]}