Your article is protected by copyright and all rights are held exclusively by Shiraz University. This e-offprint is for personal use only and shall not be self-archived in electronic repositories. If you wish to self-archive your article, please use the accepted manuscript version for posting on your own website. You may further deposit the accepted manuscript version in any repository, provided it is only made publicly available 12 months after official publication or later and provided acknowledgement is given to the original source of publication and a link is inserted to the published article on Springer's website. The link must be accompanied by the following text: "The final publication is available at link.springer.com". AbstractGeopolymer is synthesized by mixing material rich in alumina and silica, such as fly ash, with a highly alkaline solution to form a hardened matrix. However, when using high calcium fly ash as a precursor, a flash set frequently occurs, i.e., the mixture hardens very rapidly before casting can be completed. The use of borax as an additive has been reported due to its potential to prolong the setting time. In this study, the use of a significantly higher dosage of borax is explored. The results show that the addition of borax up to 20% of fly ash, by mass, into the alkaline solution prolongs the setting time by up to 90 min. Conversely, the addition of higher amounts of borax tends to decrease the compressive strength of the geopolymer, whereas adding a small amount of calcium oxide into the mixture increases the strength marginally, especially when the borax content is small. However, the amount of calcium oxide should be limited because at higher content, the effectiveness of borax to prolong the setting time is reduced.

Pembangunan apartemen merupakan solusi yang baik untuk memenuhi kebutuhan tempat tinggal di Surabaya di mana lahan semakin sempit dan semakin mahal. Namun, seiring berjalannya waktu kerusakan apartemen merupakan hal yang pasti terjadi dan harus ditangani untuk bisa menjaga kepuasan dari penghuni apartemen. Penelitian ini meneliti kepuasan penghuni terhadap respon manajemen dalam menangani kerusakan yang terjadi pada apartemen. Kerusakan yang dianalisa adalah kerusakan struktural, non struktural di dalam dan di luar unit apartemen. Data diperoleh melalui kuisioner pada penghuni apartemen di Surabaya sejumlah 100 responden, data diolah dan diuji menggunakan analisa Partial Least Square. Hasil uji menampilkan kerusakan non struktural apartemen memberi pengaruh yang signifikan terhadap respon manajemen properti. Sedangkan kerusakan struktural dan kerusakan di luar unit apartemen tidak memberi pengaruh. Respon manajemen properti juga memberi dampak yang signifikan terhadap kepuasan penghuni bangunan. Nilai prediktif Q2 menyatakan data pada model mampu menjelaskan sebesar 55.7 % dan sisanya 44.3% adalah variabel lain yang perlu diteliti lebih lanjut.