Lightweight concrete modular integrated construction (MIC) system

A method of assembling a multi-storey modular building comprising a plurality of concrete-based prefabricated modules, the method comprising:

• positioning a first lightweight concrete-based prefabricated module on a first level, the module having at least four concrete load-bearing elements including at least one beam and at least one column, and at least one horizontal structure selected from a ceiling or a floor that is at least partially attached to two or more of the load-bearing elements and the at least one column having a grout-accepting cavity at a top end thereof;
• applying grout to the grout-accepting cavity;
• positioning a vertical alignment connector attached to a horizontal load-distributing plate on the first module such that bottom portion of the vertical alignment connector is positioned in the grout accepting cavity in the top end of the column of the first lightweight concrete-based prefabricated module with the horizontal load-distributing plate positioned on the top end of the column of the first lightweight concrete-based prefabricated module;
• positioning a second lightweight concrete-based prefabricated module over the first lightweight concrete-based prefabricated module, the second lightweight concrete-based prefabricated module having at least four concrete load-bearing elements including at least one beam and at least one column and at least one horizontal structure selected from a ceiling or a floor that is at least partially attached to two or more of the load-bearing elements, the at least one column having a grout-accepting cavity at a bottom end thereof;
• the second lightweight concrete-based prefabricated module being positioned such that a top end of the vertical alignment connector is inserted into the grout-accepting cavity at the bottom end of the at least one column and the horizontal load-distributing plate is positioned between the first and second lightweight concrete-based prefabricated modules.