The influence of a complex application of both plasticizing and air-entraining effects on concrete with polycarboxylate ether superplasticizer (PCE), air-entraining admixture (AIR), or an anti-foaming agent (AF) is analyzed in this paper with considerations for on the air content, workability, flexural and compressive strength, and freezing–thawing resistance of hardened cement mixtures. The effect of the complex behavior of PCE, AIR, and AF on the porosity of hardened cement mortar (HCM) and freezing–thawing resistance was investigated; freezing–thawing resistance prediction methodology for plasticized mortar was also evaluated. The results presented in the article demonstrate the beneficial influence of entrained air content on consistency and stability of cement mortar, closed porosity, and durability of concrete. Freezing–thawing factor KF depending on porosity parameters can be used for freezing–thawing resistance prediction. With both plasticizing (decrease in the water–cement ratio) and air-entraining effects (increase in the amount of entrained air content), the frost resistance of concrete increases, scaling decreases exponentially, and it is possible to obtain great frost resistance for cement-based material.
The influence of saw waste from the extraction of natural shell stone from the Beineu deposit and chemical additives on the preservation of the properties of the concrete mixture is investigated. It was determined that when using the MasterRheobuild 5555 superplasticizer (1.6% of the binder weight or 6.75 kg/m3), the mobility of the concrete mixture is maintained for 2 hours, then its sharp decrease occurs and this is accompanied by a decrease in the volume of entrained air to 16%. The introduction of the Sika ViscoCrete 20HE KZ superplasticizer into the concrete mixture B35 in an amount of 1% of the binder weight or 4.20 kg / m3 prolongs the retention of mobility up to 4 hours 30 minutes and a decrease in the precipitation of the cone is accompanied by a decrease in the initial volume of entrained air to 7%. The research results have shown that in order to increase the preservation of concrete mixtures with superplasticizers, it is necessary first of all to select the components of "superplasticizer – cement - filler", which have good compatibility.
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