Parameters and teradata Dynamic SQL

I'm trying to use a parameter within my dynamic sql query, but just can't get it to work. I simplified my code to highlight only the part I'm struggling with.
I first create 't1', to which I insert the record.

create volatile table t1 as(
select date '1900-01-01' as date_col
)with data on commit preserve rows;

First procedure works fine, and insert the given date (2014-01-01).

replace procedure mi_table.dynamic_param()
begin
CALL DBC.SYSEXECSQL(
'insert into t1
select date '||'''2014-01-01'''||' ;'
);
end;

What I really want to do and doesn't work, is something as such:

replace procedure mi_table.dynamic_param() begin
declare max_avail_date date;
set max_avail_date = date '2014-01-01' ;
CALL DBC.SYSEXECSQL(
'insert into t1 select '||:max_avail_date||' ;'
);
end;

which doesn't work. I tried what seems to be all possible combinations of possible ways to write the parameter into my dynamic sql, but it never worked.
Suggestions anyone? Thanks!