The use of concrete block material instead of rubble stone on shallow foundation work has many advantages. One aspect that needs to be studied is its workforce productivity. This paper aims to elaborate workforce productivity on shallow foundation work with concrete block material and compare its result to Standard of SNI 2836:2008. Data are collected from construction project which has site-wide construction in Krandon and site-narrow construction in Keringan. The method of data collection has been done by direct investigation from the beginning to the end of the foundation project and complemented by photo and video. These findings have shown that workforce productivity on shallow foundation work with concrete block material both in widesite and narrow site construction is higher than that of SNI Standards, i.e. 48,87% and 7,14% higher, respectively. Moreover, the productivity rate tends to increase due to the learning effect and adaptation on this foundation work done repetitively. There is a learning curve: y=0,1271.ln(x)+0,4818, in which y=productivity rate and x=work session.
Shallow foundation work with rubble stone material has several weaknesses, such as surface and shape irregularity and scarcity in a certain location. These weaknesses can be avoided through the use of concrete block material as a positive contribution for this research. This article provides the efficiency in the use of concrete blocks instead of rubble stones in shallow foundation work, by highlighting work productivity and total cost of work for both materials. Data is collected on a wall fence foundation work which implemented both materials successfully in Grogolan, Umbulmartani, Ngemplak, Sleman Yogyakarta Province. This research has revealed that the average productivity on concrete blocks and rubble stones is 0.799 m3/h and 0.590 m3/h respectively, in which there is a time efficiency that concrete block construction is 35,44% faster than that of rubble stone. Total cost of concrete block will be more expensive than rubble stone if the work volume is small, nevertheless it reaches a break-even-point at work volume of 11 m3, meaning that a cost efficiency of concrete block construction occurs if the work volume is more than 11 m3. Moreover, the implementation of concrete block has 4 intangible benefits i.e. saving space usage, minimum waste, ease of work, and more precise product.
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