Sürdürülebilir yapı üretimi bilincinin, yapı malzemesi üretiminden başlayarak dikkate alınması gerekir. Günümüz yapı üretiminde yaygın olarak tüketilen çimentonun yüksek maliyeti ve çevreye olumsuz etkileri değerlendirildiğinde, alternatif malzeme-bağlayıcı araştırmaları gereği ortaya çıkmaktadır. En eski yapı malzemelerinden olan puzolanlı kireç harçlarının yüksek durabilite özelliklerine karşın, ortam sıcaklığında kürlendiklerinde yavaş dayanım kazanmaları, kullanımlarının azalmasına neden olmuştur.Ülkemizdeki rezervleri göz önüne alındığında, perlitin yapı malzemesi alanında kullanım olanaklarının araştırılmasının gereği ortaya çıkmaktadır. Perlitin puzolanik özeliğinden yararlanılarak kullanılması olanaklarının araştırılması ve kullanımının yaygınlaştırılması bu çalışmanın ana amacıdır. Bu amaca yönelik olarak, perlitin puzolanik aktivitesine etki eden parametrelerin belirlenmesi ve bu parametrelerin, aktiviteyi artırıcı yönde geliştirilmesi olanakları, deneysel yöntemler ile araştırılmıştır. Saptanan en uygun kompozisyonlar üzerinde puzolanik aktiviteyi geliştirecek yöntemlerin belirlenmesi, katkı maddeleri ile puzolanik etkinliğin geliştirilmesi olanakları incelenmiştir. Bu amaçla üretilen numune türleri üzerinde ultrases geçiş hızı ile eğilme ve basınç dayanımı deneyleri ölçüt olarak kullanılmıştır. Deneye dayalı bu araştırma ile elde edilen bulgular ve bu bulguların değerlendirilmesi sonucunda, perlitin puzolanik aktivite gösterdiği kanıtlanmış, perlitli kireç harcının aktivite gelişimini etkileyen faktörler belirlenmiştir. Çalışmanın amacına uygun olarak perlitin puzolan malzeme olarak geliştirilebilme potansiyeli olduğu saptanmıştır. Anahtar Kelimeler: Puzolanik aktivite, perlit, kireç harcı.The consciousness of sustainability in the production of buildings should be considered beginning from building materials production. From the raw material process to recycling, whole phases of a sustainable material should be fit to ecological criteria. Fewer amounts of embodied energy and diffusion of harmful gas emission are priority criteria for whole phases. When the high cost and the negative environmental affects of the frequently used material cement is considered, the certain need for a research of an alternative adherent material appears. Although, one of the oldest construction materials; pozzolanic lime mortars, have high durability, the long term strength development caused to decrease of its usage. Although lime mortars have considerable durability, they present lower strengths than cement mortars and take longer to reach them. In this context, one of the aims of this study is to encourage the widespread use of lime mortars in construction. The other aim is to utilize perlite as a building material without expansion which is the general case in the construction praxis. In this study, determining the parameters of perlite effecting pozzolanic activity, and developing these parameters on increasing the features of activity, has been the main objective. Determination of the methods to develop increase of the pozzolanic activity on the most convenient compositions and the effectiveness of pozzolanic activity with additives is studied. Flexural strength, compressive strength and ultrasound velocity of the specimens, the slump test of wet mortar has also been done to determine the minimum required strength durability of the perlite- lime mortar. In order to increase the pozzolanic activity of raw (crude) perlite, several methods were studied: the effect of mixture proportions (lime /lime +pozzolan ratio, water/binder ratio, additive type and amount) curing time and curing conditions. The lime/ lime + pozzolan ratio shows a large effect on the strength of lime-pozzolan cement. If less lime is added, the hydration products produced are insufficient to fill the voids and bind particles together; the paste shows low strength. In contrast, if too much lime is added, the extra lime will exist in a free state which does not have any binding ability and thus decreases the strength of the paste. For researching different lime/ lime+pozzolan ratio 5 specimens were examined. The highest strength and ultra sound velocity obtained with 67% lime/ lime + pozzolan ratio, which defined on TS 25. By evaluating reference specimen's plastic consistency, for researching different water/binder ratio, increasing the water ratio was preferred. Because decreasing the water/binder ratio was not convenient for mortar workability. All other mortar components ratios were kept the same with reference specimens. So, 3 specimens were tested. Test results showed that, while porosity increased, strength and ultrasound velocity decreased, by increasing the water amount. The highest strength and ultra sound velocity obtained with 50%, water/binder ratio which defined on TS 25. To determine the effect of the additives CaCl2 and Na2SO4 2% and 4% ratio were produced for compare the reference specimen. Although CaCl2 additive obtained high strength than reference specimens with both ratios, 4% ratio obtained the highest strength. While 2% Na2SO4 additive decreased the strength, on the contrary 4% Na2SO4 additive obtained high strength than reference specimen but not higher than 4% CaCl2 additive specimen. Investigating the effect of the curing temperature, specimens were cured at 23, 55 and 65°C while all mortar components ratio were kept the same with reference specimens. Curing at 23°C is not enough to achieve adequate strength development. While the highest ultra sound velocity obtained with curing at 65°C; the highest strength obtained with curing at 55°C which defined on TS 25. The last parameter which is dealed with in this study is curing time. Curing time were determined by specimens which were cured 7, 14, 28 days at 55°C. All these specimens had the same components ratio with reference specimens.Test results showed that, strength development parallel to curing time. Experiments indicate that, the mortar components, which mean pozzolan ratio and water ratio, additive types and their ratio affect the mortar strength. On the other hand curing conditions, which mean curing temperature and curing time, also effect the strength development. It is determined that, pozzolanic reaction keeps on by the curing time. The results of this experimental study indicate that the prepared mortars are convenient for restorations of historical lime based masonry and brick. Keywords: Pozzolanic activity, perlite, lime mortars
