INFLUENCE OF STICKY RICE AND MODIFIED STICKY RICE ON THE PROPERTIES OF LIME MORTAR

Abstract

Lime mortar is a traditional building component made from lime, sand, and water that is generally used in masonry construction. Unlike cement mortar, lime mortar hardens slowly by a process known as carbonation. Lime mortar also weathers over time with a gentle touch, as it integrates very well with old stone work. It has some disadvantages, however, including decreased initial strength and increased drying times, which can restrict its use in certain modern building applications. In spite of this, its performance in historical preservation and eco-friendly construction practices makes it a useful material in architecture. Natural additives enhance the workability, water retention, and bonding properties of the mortar without making it impermeable or incompatible with brickwork. For instance, sticky rice water, with its polysaccharides like amylopectin, acts as a natural binder, enhancing the cohesion and mechanical strength of lime mortar. Other organic additives, including molasses, oils, and cactus mucilage, have been found to avoid shrinkage, control setting time, and enhance durability. As interest in sustainable and historically accurate materials grows, use of organic compounds in lime mortar is being reassessed for restoration and for environmentally friendly construction methods A common traditional mortar used in many significant buildings is lime mortar mixed with sticky rice. However, there are variations in the amounts of water used to make mortar of lime to advance properties of sticky rice because of a lack of documentation. Additionally, not much research has been done on the proper amounts and functionality of starchy water in mortar of lime. Additionally, sticky rice can have a variety of ingredients added to improve its qualities. Cellulose is an example of such an addition. Therefore, the purpose of this learning is to test the strength due to compression, tensile strength, shear bond strength, water absorption, wetting & drying for lime mortar enhanced with sticky rice and sticky rice and cellulose. Compressive strength tests were performed for various percentages of sticky rice (3%, 5%, 7% & 9% by weight of water) with lime 1 unit and sand 3 units in order to optimize the process. The maximum increase in compressive strength observed at 5% which is 43.59% higher than that of lime mortar without additive. For this improved sticky rice ratio, cellulose was added in amounts of 2%, 4%, and 6% (by weight of sticky rice). The best results of compressive were achieved by combining 6% cellulose and 5% sticky rice in a lime mortar which is 67.90% greater than lime mortar without additive. Other attributes were examined for these optimized ratios of cellulose and sticky ice iv | P a g e ratios. When cellulose is added to sticky rice, it significantly reduces its workability to 105% which increased maximum to about 7.3% when only sticky rice was added. Both sticky rice and sticky rice with cellulose demonstrated a significant increase in tensile strength. There was increase of about 36.36% when 5% sticky rice was added in lime mortar and further increases to about 65.50% when 6% cellulose was added in 5% sticky rice. Water absorption was about 14.85% on addition of sticky rice which is greater than reference mortar. For reference mortar it was 12.48% Water absorption decreased on addition of cellulose, it was only 6.53%. There was mass loss of 2.93% in lime mortar without additive. On addition of sticky rice it reduced to 1.74%. The best results came out when cellulose was added with sticky rice in lime mortar. The mass loss was only 1.176% Also, both sticky rice and modified sticky rice show higher resistance to acid and alkali attacks, with the latter being more robust. For reference mortar decrement in weight after 28 days of acid attack was 15.5%. For sticky rice mortar it came out to be 10% and for modified sticky rice it was only 7.2%. There was 35% decrement in compressive strength after 28 days of submergence in alkali solution in reference mortar, reduces to 11.96% in sticky rice mortar and 10.31% for modified sticky rice. Bond shear strength test shows best results with cellulose in sticky rice in lime mortar. There was increase of 18.18% in bond strength when sticky rice was added to lime mortar. Further on addition of cellulose it increased to 55.11%.