Studi literatur pengaruh konsentrasi naoh dan rasio NaOH : Na2SiO3, rasio air/frekusor, suhu curing, dan jenis frekusor terhadap kuat tekan beton geopolimer = Literature study comparative effect of concentration of NaOH and ratio of NaOH:Na2SiO3, ratio of water/precursor, curing temperature, and type of precursor to compression strength of geopolymer concrete