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Resumo: Ocorrencias de solos residuais siltosos de rochas de micaxisto e gnaisse em vastas areas da regiao de Sao Paulo representam uma grande dificuldade para a pavimentacao de vias em periferias. Tais solos apresentam expansao elevada quando saturados e baixa capacidade de suporte, sendo que sua estabilizacao e tradicionalmente realizada com emprego de agregados quando nao sao simplesmente descartados. Isso impoe custos elevados de pavimentacao nessas zonas. Neste artigo sao apresentadas recentes experiencias com a modificacao desses solos com cimentos de alto forno, buscando-se controlar sua expansao e com ganhos de capacidade portante. Foram obtidos resultados positivos no controle de expansao com baixos consumos de ligante hidraulico, porem sem melhorias significativas quanto ao modulo de resiliencia das misturas. Misturas solo-brita-cimento requereram maior consumo ligante com aumento do modulo de resiliencia, com restricoes para a resistencia a tracao do material. Os resultados apontam a viabilidade das misturas estudadas para reforcos de subleitos e sub-bases. Abstract: Residual silt finely granulated soils from micaschists and gneisses in Sao Paulo represent huge limitations for urban paving in suburban areas. Those soils have high expansion as well as low bearing capacity; its stabilization, whenever possible, is done by means of soil-aggregate mixtures or they are replaced by alternative soils at high excavation and transportation costs. This paper analyses results of soil-cement stabilization for such soils using blast furnace cements aiming at the control of its expansion and improvements on its strength. Nevertheless good results were achieved for controlling expansion with low cement content, resilient modulus did not increase. Soil-aggregate-cement mixtures achieved good improvement on its resilient modulus although the tensile strength of the material was still low, making it not prudent, under a mechanistic stand point, to use it as pavement bases. Results point out the suitability of the blast furnace cement stabilized soils as subgrade and sub-bases layers.

Estabilização de solos siltosos expansivos de São Paulo com ligantes com elevado teor de escória para pavimentação