In order to produce porous concrete, the use of an organic additive with
water-reducing, dispersing and/or flowability-increasing properties is
provided. This additive is at least one representative of the series of
polycondensation products based on naphthalinsulfonic acids or
alkylnaphthalinsulfonic acids, melamine-formaldehyde resins containing
sulfonic acid groups, and copolymers based on unsaturated mono- or
dicarboxylic acid derivatives and on oxyalkylene glycol-alkenyl ethers.
This additive is preferably admixed to a non-foamed and, in particular,
mixing water-free porous concrete base mix containing lime, a hydraulic
binder, preferably cement and sand, whereby quantities between 0.01 and
10% by weight are considered as preferred quantities. By using the
additive in the aforementioned manner, the method for producing porous
concrete can be carried out using distinctly less energy and thus more
cost-effectively without negatively influencing the typical properties of
porous concrete products.