Terezinha Galvao

Spelman College · Environment and Health Sciences

Soil erosion, transport and deposition of sediments represent invisible threats that along time can affect negatively the existing infrastructure of roads and dams, and the quality of air and water resources. In the last decades, a great number of researches were devoted to study erosion and sediments transportation processes. However, they address...

O estudo investiga os movimentos de massa em taludes da região de Belo Horizonte, representativos de áreas de grande instabilidade. Na região ocorrem variados tipos de movimentos de massa particulares de três grupos de materiais geológicos distintos. No primeiro grupo, representado por filitos e xistos, o desencadeamento dos processos dependem da d...

Over the years, paper production and development processes have continuously changed to meet the demands of our society. Direct consequences are rapid transformation of production processes and use of new chemicals. Indirectly, changes have occurred to wastewater compositions and their impacts on the receiving environment. Mitigation of the negativ...

Slope failures in the tropics are directly related to the rainfall intensity. Refining techniques to prevent rain-induced slope failures play an important role, especially for the risky occupied areas close to big cities-the final destination from people who migrates from rural to urban areas. This paper presents the implementation of bioengineerin...

This study evaluates the amount of organic carbon accumulated in the superficial soil layer of slopes that were revegetated 10 years ago, using four different bioengineering techniques. These techniques consisted of soil revegetation: (i) covered with mulches of ground guinea grass (Panicum maximum); (ii) covered with geotextiles (Rolled Erosion Co...

Soil erosion and sediment transport represent invisible threats that, in small steps, impact severely on the existing infrastructure of roads and dams, and on the quality of air and water resources. In recent decades, a large amount of research has been devoted to erosion and sediment-transportation processes. However, it was mostly concentrated on...

Cracks in clayey landfill liner, which cannot be closed up upon re-wetting, affect the long-term performance of a landfill. In this paper, the mixture bentonite-zeolite (BEZ) is presented as a potential liner material due to its plastic properties. Also, it may fulfill an existing demand, in developing countries, for liners that are cost-effective,...

The effects of charge reversal about the measured point of zero charge (pH(0) approximately 5.2) of untreated and treated Sete Lagoas lateritic soil of Brazil on aqueous polymer sorption was investigated. The polymers are anionic sodium carboxymethyl cellulose (CMCA), nonionic polyethylene oxide (PEO), and cationic polyacrylamide (PAM). They were p...

Dust constitutes an environmental and human health menace in many regions of the world. The rate of soil desiccation is a significant determinant of the availability of fine soil particles for entrainment in air as dust. Dust suppressants such as polymer solutions can reduce soil desiccation rate, thereby reducing dust emission factor. Herein, a du...

RESUMO Este trabalho apresenta uma investigação da estabilidade de um talude no município de Rio Acima, MG. Os estudos envolveram métodos geotécnicos tradicionais, e também a aplicação de estudos micromorfológicos de solo e investigações geofísicas durante a análise de estabilidade. Os resultados permitiram observar a presença de diferentes mecanis...

Condicionantes e mecanismos de ruptura de taludes da Região Metropolitana de Belo Horizonte.

An investigation of the effect of hydrated lime on the permeability and compressibility of two Brazilian soils: a brown saprolitic soil, Soil 1, and a red lateritic soil, Soil 2, is presented. Details of the test methods and materials are given. The results obtained show that the coefficient of permeability of Soil I increased about fivefold when 2...

The potential for the use of kiln ash as an additive to Lateritic soils to improve their engineering characteristics as road construction material was experimentally investigated. The results of laboratory tests indicate that no significant improvement of the soil properties occurred until after several weeks of curing time. In general, as the cont...

This note describes a technique for cutting undisturbed brittle block samples into smaller specimens for further geotechnical testing. This technique revealed very useful in dealing with collapsible soils, where the sampling is recommended to be done with block soil samples. A further use of this technique as an efficient way for sampling collapsib...

Lateritic soils found around Belo Horizonte City, Brazil, are highly weathered, acidic, developed in place, and prone to erosion and landslides. Engineers consider similar soils to cover 65% of the Brazilian superficial area. This paper presents a reconnaissance survey of erosion hazards in the City of Belo Horizonte, Brazil. The survey covered mor...

Presents the studies performed to evaluate the performance of rolled erosion control products (RECPs) in the prevention of sheet erosion in a road cut slope, under simulated rain conditions. The four different covers used were: ARP 430 – vegetative screen, ARP-440 – biotextil screen, grass mulch geotextil, control 1 (no rolled product and no vegeta...

Soils weathered from limestone and sediments of the Bambui Formation in parts of Minas Gerais, Brazil, are prone to near-surface subsidence, resulting in damage to buildings and roads, and loss of life. Engineers consider them 'collapsible soils' because they exhibit large decreases in volume and associated settlements with no increase in applied s...

The association of vegetation and civil engineering materials (wood, plastic, rocks, etc.) for erosion control and degraded land rehabilitation, known as bioengineering techniques, only recently, has been used in South America. Especially in Brazil, climate conditions favor plant growth throughout almost the whole year, which makes the use of those...

The mineralogical, chemical, and geotechnical properties of a latosol from the uplands of Minas Gerais, Brazil were studied to identify its collapsibility characteristics, which are little known. Near surface subsidence is a serious problem in the area and civil engineers consider soils with similar characteristics to cover 65% of the Brazilian lan...