Technical notes on Portland-cement concrete technology.https://concreto.tec.brenhttps://concreto.tec.br/en/blog/autogenous-shrinkage-internal-curing-saphttps://concreto.tec.br/en/blog/autogenous-shrinkage-internal-curing-sapIn a low water–cement mix, hydration dries the paste from the inside. That shrinkage does not require loss to the surroundings; external curing stays mandatory, and Jensen and Hansen (2001) propose internal curing with SAP.Fri, 30 Oct 2026 00:00:00 GMTshrinkagecuringmix designhttps://concreto.tec.br/en/blog/carbonation-service-life-possan-modelhttps://concreto.tec.br/en/blog/carbonation-service-life-possan-modelCO2 from the air lowers the pH of the cover until the steel is depassivated. Possan's 2010 model estimates the front and the service life from job-site variables, and NBR 6118 leaves the specification to the aggressiveness class.Tue, 27 Oct 2026 00:00:00 GMTdurabilitycarbonationservice lifehttps://concreto.tec.br/en/blog/lc3-limestone-calcined-clay-cementhttps://concreto.tec.br/en/blog/lc3-limestone-calcined-clay-cementWhat LC3-50 is, why reactivity depends on the kaolinite content of the clay, and what to measure before treating the 50/30/15/5 recipe as the cement of the job.Fri, 23 Oct 2026 00:00:00 GMTlow-clinker cementssupplementary cementitious materialsLC3https://concreto.tec.br/en/blog/c-s-h-nucleation-seedinghttps://concreto.tec.br/en/blog/c-s-h-nucleation-seedingWhy low-clinker cement gains strength slowly, how a C-S-H seed changes nucleation, what slag does to later strength, and why the number of nuclei matters more than the mass added.Tue, 20 Oct 2026 00:00:00 GMThydrationsupplementary cementitious materialslow-clinker cementshttps://concreto.tec.br/en/blog/asr-supplementary-cementitious-materialshttps://concreto.tec.br/en/blog/asr-supplementary-cementitious-materialsWhat ASR is, how silica fume, metakaolin, fly ash and slag mitigate it through a low Ca/Si C-S-H, why there is no universal replacement level, and how NBR 15577 requires the mitigation to be proved with the cement and the SCM of the job.Fri, 16 Oct 2026 00:00:00 GMTdurabilityASRsupplementary cementitious materialshttps://concreto.tec.br/en/blog/clay-in-sand-pce-admixturehttps://concreto.tec.br/en/blog/clay-in-sand-pce-admixtureSand carrying clay, especially smectite, binds polycarboxylate superplasticizer. Slump vanishes, and making it up with water is a different concrete.Fri, 02 Oct 2026 00:00:00 GMTmix designadmixturesaggregateshttps://concreto.tec.br/en/blog/delayed-ettringite-formationhttps://concreto.tec.br/en/blog/delayed-ettringite-formationWhy a temperature peak in mass concrete can plant ettringite that only expands once the concrete is hard — and what mix design and thermal control have to do with it.Fri, 18 Sep 2026 00:00:00 GMTdurabilitymass concretedeterioration