Submitted by: Silka

Admixture technology for uniform filling of molds

The quality of concrete products made of semi-dry concrete significantly depends on the compaction (porosity) achieved. The latter already differs within a concrete batch owing to varying filling levels in separate mold parts. In the last decades, the semi-dry concrete grades used contained ever more moisture in order to obtain a better compaction and more complete hydration of the cements. Unfortunately, this increases the stickiness and enhances variations in the filling level, causing above all visually annoying differences in the edge pattern as well as the drying behavior and efflorescence behavior, apart from varying strengths. Consequently, a uniform filling of all mold parts by a free-flowing semi-dry concrete is the prerequisite for the manufacture of high-quality paving blocks, masonry units and curbstones.

The „flowability“ test method, especially developed by Sika for the issue of „uniform mold filling behavior“, enables a systematic examination of the influencing factors in respect of concrete technology. Tests of numerous admixture raw materials coming into question resulted in the innovative admixture technology. The admixture is available under the name of SikaPaver HC-218 and was already presented in the BFT 07/2019 edition. Link: www.bft-international.com/en/artikel/bft_Filling_and_compaction_aid_for_concrete_products_developed_3388211.html

CONTACT
Sika Deutschland GmbH
Kornwestheimer Str. 103-107
70439 Stuttgart/Germany
+49 711 8009-0

Related articles:

Issue 2019-07 SIKA

Filling and compaction aid for concrete products developed

From now on, the newly developed SikaPaver HC-218 filling and compaction aid is available to the concrete product industry. The product on the basis of an innovative formulation minimizes the...

more
Issue 2021-09

Ever better, ever faster – increased quality and productivity in the manufacture of concrete products

Customers increasingly expect pavers to have an appealing and consistently uniform look. The higher quality requirements are defined by properties such as brilliant colors, absence of efflorescence,...

more
Issue 2020-12 MC-BAUCHEMIE

New waterproofing admixture Murasan Hydrotech 883 for concrete goods

With Murasan Hydrotech 883, MC-Bauchemie has launched a waterproofing solution for the production of both semi-dry and wet-cast concrete goods. With this new hydrophobic admixture, concrete goods...

more

BFT-expert-forum “Wetcast” was a great success

Great participation and high satisfaction values were achieved by the BFT expert forum WetCast 2022. More than 50 experts from concrete block- and precast plants as well as from companies of the...

more
Issue 2022-07 BFT INTERNATIONAL

BFT-expert-forum “Wetcast” was a great success

Great participation and high satisfaction values were achieved by the BFT expert forum WetCast 2022. More than 50 experts from concrete block- and precast plants as well as from companies of the...

more