Sulfate Durability Of Mortars Produced With And Without Natural Zeolite And Fly Ash

Year 2002, Volume: 15 Issue: 2, 11 - 24, 31.12.2002

Fethullah Canpolat Kemalettin Yılmaz

Abstract

An investigation was carried out on the effect of sodium sulfate on the sulfate durability of mortars produced with natural zeolite and fly ash having puzzolanic character. Experiments were carried out on the Rilem portland cement standart mortars and cement – natural zeoılite mortars where the zeolite replaced 20 %, 30 %, 15 % zeolit + 5 % fly ash and 25 % + 5 % fly ash of the cement by weight. Sodyum sulfate concentrations were 5 % and 10 %. Sulfate exposures of mortars were initiated after 28 days of lime saturated water curing. Flexural strength, compressive strength and density were determined at the beginning of exposure and at the 2, 7, 28, 90th days. Water and solutions were renewed after each period of experimental time which was 14 days. Mass changes were determined at the time of renewing the solutions. The effects of sodium sulfate solutions on the properties of mortars were related to the zeolite ratio. Zeolite replacement caused significant increase in sulfate durability of mortars even at the highest sulfate concentration up to 90 days of exposure.

Keywords

Natural zeolite, fly ash, durability, cement additives, sulfate attacks

Doğal Zeolit Ve Uçucu Kül Katkılı Ve Katkısız Harçların Sülfat Dayanıklılığı

Abstract

Puzolanik özelliği deneysel olarak belirlenen doğal zeolitin ve uçucu külün sülfata karşı dayanıklılığını araştırmak için % 5 ve % 10 ‘luk sodyum sülfat çözeltileri kullanılmıştır. Deneyler standart harçlarda ve çimento ağırlığının % 20 ve % 30 oranlarında ikameli olarak doğal zeolit , % 15 zeolit + % 5 uçucu kül ve % 25 zeolit + % 5 uçucu kül katılmış harçlarda yapılmıştır. Nümuneler 28 gün kirece doygun suda saklanmış ve 28. gün eskitme süreci için başlangıç kabul edilmiştir. Başlangıçta 2, 7, 28, 90. günlerde nümunelerde eğilme dayanımı, basınç dayanımı ve birim ağırlık belirlenmiştir. Çözeltiler 14 gün ara ile yenilenmiş ve bu periyotlarda ağırlıklar ölçülmüştür. Sodyum sülfat çözeltilerinin harç özelliklerine etkileri zeolit oranına göre değerlendirilmiştir. Çimentoya zeolit katılması 90. güne kadar yüksek konsantrasyonda bile harcın sülfata karşı dayanıklılığına olumlu etki yapmıştır.

Keywords

doğal zeolit, uçucu kül, dayanıklılık, çimento katkıları, sülfat etkisi

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