Analysis of the Effect of Adding Sandy Clay into Cement Mortar on the Bending Strength of Built-Up Masonry Prisms

Abstract

Mortar is a workable paste essential in civil and building construction. Mortar works as binding material extensively use for masonry unit in construction. The global consumption of natural sand is very high, due to the extensive use of concrete or mortar. Natural sand deposits are being depleted and causing a serious threat to the environment as well as the society. Sandy clay has been widely use in preparing the mortar for masonry work. The aim of this research was to study the bending strength of built-up masonry prism using sandy clay mortar. There were two series of mortar containing 0% and 100% of sandy clay had been prepared. The sandy clay was used to replace natural fine aggregate. Mortar with 0% sandy clay was the control mix containing 100% natural fine aggregate. Three types of masonry unit consist of clay brick, cement brick and lightweight brick were used in this study. The masonry units were combined together using the mortar joints to form the masonry prisms. 100% natural fine sand and 100% sandy clay mortar were prepared and used for the joints. Built-up masonry prisms with single and double joints of mortar. Also, the masonry prisms contained from a length ranging from 390 mm to 610 mm were prepared using the mortar joints. The thickness of the mortar joint which was used in this study was 10 mm, 20 mm and 30 mm. the prisms had been tested for the determination of bending strength at 28 days. The experimental results were analyzed to investigate the effect of sandy clay and thickness of mortar on the bending strength of built-up masonry prism. Results had shown that masonry prism built with sandy clay mortar has higher bending strength compare to the fine sand mortar. Clay brick exhibited highest bending strength with sandy clay mortar which was 38.28 N/mm2and cement brick had the lowest bending strength which was 18.8 N/mm2, while cement brick achieved optimum bending strength. In addition, the highest collapse and deflection achieved by clay brick and cement brick whereas the lowest value of collapse and deflection was by lightweight brick. The highest percentage of increment in terms of collapse load was determined to be 13.73% for sandy clay mortar prism. Hence, 100% sandy clay mortar is suitable to be used in masonry works.

Drying Shrinkage Properties and Initial Bonding Strength of 3D Printing Mortar

“…Sandy clay has been introduced as material as a replacement of fine aggregate in the production of mortar. Sandy clay has been widely used as one of the construction materials for the internal and external works in many countries due to its advantages [6]. These advantages include low 1022 (2022) 012045 IOP Publishing doi:10.1088/1755-1315/1022/1/012045 2 costs, sustainable materials, and safe for recycling at the end of lifecycle [7].…”

“…The highest slump was obtained on M2-25, 75 mm, then follow by M1-25, M2-50, M2-75, M1-50, and M1-75 with the slump of 44 mm, 25 mm, 22 mm, 20 mm, and 15 mm. Sandy clay is attributed with fine particle size and mortar tends to be less workable with finer particle size[6,14]. The finding can be explained as the low sandy clay content have contributed to increment of workability.…”