Abstract
LUSI mud obtained from the mud volcano in Sidoarjo, Indonesia, is a viable aluminosilicate material to be utilized as pozzolanic material. LUSI is an abbreviation of the local name of the mud, i.e., Lumpur Sidoarjo, meaning Sidoarjo mud. This paper reports the results of an investigation to assess the pozzolanic activity of LUSI mud, especially in semi high volume pozzolanic mortar. In this case, the amount of mud incorporated is between 30% to 40% of total cementitious material, by mass. The content of SiO2 in the mud is about 30%, whilst the total content of SiO2, Fe2O3 and Al2O3 is more than 70%. Particle size and degree of partial cement replacement by treated LUSI mud affect the compressive strength, the strength activity index (SAI), the rate of pozzolanic activity development, and the workability of mortar incorporating LUSI mud. Manufacturing semi high volume LUSI mud mortar, up to at least 40% cement replacement, is a possibility, especially with a smaller particle size of LUSI mud, less than 63 μm. The use of a larger percentage of cement replacement by LUSI mud does not show any adverse effect on the water demand, as the flow of the fresh mortar increased with the increase of percentage of LUSI mud usage.
Highlights
This year is marked as the sixth year of a mud volcano eruption, nicknamed LUSI, in Sidoarjo, Indonesia, which was started in May 2006
This study reveals that the sintered LUSI mud of the mud volcano in Sidoarjo, Indonesia, has promising potential to be used as a pozzolanic material
With the increase in the amount of LUSI mud used as partial replacement for cement up to 40%, the rate of strength development is increasing
Summary
This year is marked as the sixth year of a mud volcano eruption, nicknamed LUSI (a short form of LUmpur SIdoarjo or Sidoarjo mud), in Sidoarjo, Indonesia, which was started in May 2006. Nuruddin et al [3] applied sintering at 600 °C for a duration of one hour to convert its crystalline microstructure to an amorphous one They concluded that the mud could be used as pozzolanic material to partially replace the use of cement in making mortar, with the optimum amount of 10%. The use of treated mud of 15% resulted in an approximately similar compressive strength of mortar without any cement replacement on the 28th day of age. This study focuses on the possible use of semi high volume LUSI mud as a partial replacement for cement in making mortar. The results are correlated to examine the possibility of incorporating semi high volume LUSI mud as partial replacement for cement in making mortar or concrete
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