The Impact of Artificial Lightweight Aggregate on the Engineering Features of Geopolymer Mortar

Abstract

In this study, a research on the effectiveness of artificial lightweight aggregate (A-LWA) on the fresh and hardened properties of geopolymer mortars is presented. The main aim of this study is to propose a relatively newer means of recycling of FA through geopolymer mortar production. Therefore, firstly, artificial lightweight aggregate (A-LWA) was produced through the cold-bonding pelletization process of FA. Then, FA based geopolymer mortars were produced with this aggregate. The geopolymer mortars manufactured in this study had constant source material and alkaline activator quantities of 600 and 300 kg m-3, respectively. The proportion of Na2SiO3-to-NaOH was 2.5 and the molarity of NaOH was 12 M. The A-LWA sand was replaced partially with river sand up to 100%. The compressive strength, ultrasonic pulse velocity, fresh and dry densities of the geopolymer composites were measured at the age of 7 days and the flow table test was conducted to indicate the consistency of the geopolymer mixtures. The results indicated the A-LWA utilization enhanced the workability of the geopolymer mixtures and the highest increase of flow diameter of %20 was obtained using 100% A-LWA. Compressive strength values of geopolymer mortars varied between 4.28 and 32.3 MPa. A systematical decrease in the compressive strength and revealed with respect to the increasing level of A-LWA due to the softness and weakness of the A-LWA particles. Ultrasonic pulse velocity results of geopolymer mortars ranged from 1479 to 2596 m s-1 with related the replacement level of A-LWA.

Keywords

• Cold bonding pelletization,Compressive strength,Geopolymer mortar,Artificial Lightweight aggregate,Workability

Yapay Hafif Agreganın Geopolimer Harcın Mühendislik Özellikleri Üzerindeki Etkisi

Öz

Bu çalışmada, yapay hafif agreganın (YHA) geopolimer harçların taze ve sertleşmiş özellikleri üzerindeki etkisi üzerine bir araştırma sunulmaktadır. Bu çalışmanın ana amacı, geopolimer harç üretimi yoluyla UK'nin geri dönüşümü için nispeten daha yeni bir alternatif önermektir. Bundan dolayı, UK kullanılarak soğuk bağlama yöntemiyle YHA üretilmiştir. Sonra bu agregalar ile UK esaslı geopolimer harçlar üretilmiştir. Bu çalışmada üretilen geopolimer harçlar, sabit miktarda 600 kg m-3 UK ve 300 kg m-3 alkali aktivatör miktarları kullanılarak üretilmiştir. Na2SiO3/NaOH oranı 2.5 ve NaOH molaritesi 12 M olarak alınmıştır. YHA, dere kumuyla hacimce %100’e kadar kısmi olarak yer değiştirilerek kullanılmıştır. Geopolimer harçların basınç dayanımı, ultrasonik dalga hızı, taze ve kuru birim ağırlıkları 7 günlük süre sonunda ölçülmüştür. Taze karışımların kıvamını belirlemek için geopolimer harçlarda akış tablası deneyi yapılmıştır. Sonuçlar YHA kullanımının geopolimer karışımlarının işlenebilirliğini arttırdığını ve % 20'lik en yüksek akış çapı değerinin % 100 YHA kullanılarak elde edildiğini göstermiştir. Geopolimer harçların basınç dayanımı değerleri 4.28 -32.3 MPa arasında değişen değerler elde edilmiştir.. YHA parçacıklarının boşluklu ve zayıf yapısı nedeniyle YHA artış miktarına bağlı olarak basınç dayanımında sistematik bir azalma görülmüştür. Geopolimer harçların ultrasonik ses geçiş hızı sonuçları, YHA’nın ikame seviyesi ile ilişkili olarak 1479 ile 2596 m s-1 arasında değişen değerler elde edilmiştir

Anahtar Kelimeler

• Soğuk bağlamayla peletleme,Basınç dayanımı,Geopolimer harç,Yapay hafif agrega,İşlenebilirlik

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