Several materials have been added to oil well cement slurries to improve their fresh and hardened properties. Many of these materials are industrial and agroindustrial wastes, and their use promotes sustainable development, avoiding their disposal in the environment. In this context, this study evaluates the rheological behaviour of oil well cement slurries containing granite cutting waste. The slurries were formulated with additions of 10%, 15%, and 20% of granite waste (by weight of cement-BWOC), as well as reference slurry containing only water and Portland cement. The results revealed that slurries containing up to 20% of granite waste presented satisfactory rheological properties, proving their potential for application in oil well cementing operations. Moreover, the addition of 20% of granite waste was not considered detrimental to the compressive strength of the cement slurries.

A laringe é o órgão que permite a passagem de ar para o trato respiratório caudal através do controle do fluxo de ar durante o processo de respiração. A paralisia de laringe consiste na incapacidade uni ou bilateral das cartilagens aritenoides em abduzirem durante a inspiração. É um distúrbio que afeta principalmente cães idosos de raças grandes a gigantes e com etiologia congênita ou adquirida acometendo especialmente raças como Bouvier des Flandres, Huskie Siberiano, Bull Terrier, Pastor Alemão, Labrador, Golden Retriever, dentre outros. Os sinais clínicos incluem obstrução das vias respiratórias anteriores na inspiração, intolerância ao exercício, estridor inspiratório e alteração na vocalização, gerando um latido fraco e rouco, além de engasgos e tosses esporádicas. O diagnóstico inicia-se com os sinais clínicos, exame físico, e é definitivo pela inspeção da função laríngea por laringoscopia direta ou com auxílio de endoscópio. O tratamento de suporte consiste na estabilização do paciente com oxigenoterapia e administração de anti-inflamatórios. Em animais com angústia respiratória, terapêutica emergencial deve ser instituída.  O tratamento cirúrgico é o de eleição e consiste na estabilização e reposicionamento das cartilagens aritenoides. Este trabalho tem como objetivo relatar um caso clínico de um canino acometido com paralisia de laringe e descrever a investigação diagnóstica através do exame de laringoscopia direta.

The effects of CP V Portland cement replacement with granular marble residues were investigated. The physical-chemical properties of the starting materials and of the pastes were characterized by XRD, XRF, TG/DTA, SEM and granulometric analyses. Axial compressive strength, apparent density, capillary and total capacity of water absorption of the hardened pastes with 0, 10, 20 and 30% replacements, aged for 28 days, were characterized. The results indicated that the partial replacement by the marble residue did not affect the cement hydration but provided packaging improvements and some filler action. The reduction of CO 2 emission was estimated as 0.28 million tons per year due to replacement of 10% CP V Portland cement with the marble residue. The results indicated that this is an alternative means to reduce the CO 2 emissions in the cement industry and to reuse marble residues that otherwise could be inadequately disposed.

Fiber-cement composites were prepared from cellulosic cotton residue (CCR) arise from sanding process (emerizing). The effect of different concentrations: 0.5% and 1%, and granulometry: thick (retained in a14 mesh sieve) and thin (retained in a 48 mesh sieve) of this residue were evaluated on tensile strength of cement slurries with seven (07) curing days. To characterize the CCR, TGA, FT-IR, SEM and XRD analysis were performed and the residue resistance in an alkaline environment was also evaluated. Splitting tensile strength test, known as Brazilian Test, was used to assess effects of the fibers on the mechanical behavior of cement matrix. Analyzing the results, the CCR proved to be resistant in an alkaline environment, meaning that it can withstand the alkaline environment of cement matrix. The results showed an improvement superior to 17% in tensile strength for 1% of CCR. Therefore, the CCR presents a great application potential in cement pastes used for oil well cementing that requires to increase its tensile strength, once a significant improvement was achieved with a low-residue employee.