Behaviour Of Concrete Masonry Walls With Mortar Stronger Than Block Subjected To Compressive Loading

• Main Author: Ali Pzabez, Atman Moloud Mohamed
• Format: Thesis
• Language: English
• Published: 2011
• Subjects: T Technology; TA1-2040 Engineering (General). Civil engineering (General)
• Online Access: http://eprints.usm.my/40697/1/Behaviour_Of_Concrete_Masonry_Walls_With_Mortar_Stronger_Than_Block_Subjected_To_Compressive_Loading.pdf; http://eprints.usm.my/40697/

Penyelidikan ini mengkaji keberkesanan beban mampat menegak dalam dinding kerja batu tidak bertetulang. Empat spesimen dinding bersaiz (1228 mm x 685mm x 100 mm) dengan sifat sambungan mortal atau lepa yang berlainan digunakan. Penyelidikan ini dijalankan berdasarkan standard Bs dan ASTM. Ciri kekuatan mampat pada bongkah konkrit serta dengan bahan lain diperoleh bagi kekuatan mampat. Keputusan penyelidikan menunjukkan bahawa kekuatan mampat sambungan lepa / mortal adalah tinggi bagi bongkah konkrit. Kegagalan yang berlaku pada bongkah konkrit semasa proses pemampatan adalah retakan menegak sepanjang pusat bongkah. Di samping itu, keputusan yang diperoleh dibandingkan juga dengan nilai kaedah teori, iaitu yang dikira berdasarkan rumusan analisis anjal. Keadah yang digunakan adalah berkaitan dengan (HANDRY-1981) dan (HILSDORF-1969). ________________________________________________________________________________________________________________________ This research experiment presents an investigation of the behavior of vertical compressive loading in un-reinforced masonry walls. A total of four specimen walls sized 1228mm x 685mm x 100mm (height x length x width) were investigated, when the compressive strength properties of the mortar joints is higher than that of the concrete block. The experiment was evaluated by both the British Standard (BS) and the American Standard (ASTM). The characteristic compressive strength properties of the concrete block, together with the properties of other materials were obtained to determine the total compressive strength of the masonry wall built from them. The experimental results obtained for the materials of the wall showed that the compressive strength of mortar joints was higher than the compressive strength of the concrete blocks (as was in the experimental design). With progressive vertical loading up to the maximum compressive load which the wall can bear, the concrete block which are weaker in tensile strength showed failure as splitting cracks. Consequently, loading the wall beyond the maximum load capacity, the mortar began to spread outwards leading to more severe cracks, which will make the wall to collapse when the maximum load is exceeded. The failure in the wall specimens occurred principally in the concrete block during compression as a consequence of the general failure which occurred in the specimens, as shown by vertical cracking along the center of concrete blocks. The result obtained from the present experiment was compared with the values of the theoretical method calculated with the formula for elastic analysis. The results obtained are in conformity to that stated in the literature, especially the method of Hendry and Hilsdorf.