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).
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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.
Behaviour of concrete masonry walls with mortar stronger than block subjected to compressive loading / Atman Moloud Mohamed Ali Pzabez