Nowadays under the conditions of intensively developing construction production, hardening time and strength Portland cement are becoming more relevant research issues this type binder. The basic requirements to stated in normative industry documents considered. limits normal fast-hardening given. Raw materials for production high-strength must be homogeneous provide a high degree fineness bind...

This study has found that residence time weighted exposure (asbestos dose) may be used to model the risk and extent of pulmonary function abnormalities in a cohort of asbestos cement workers. This parameter, which incorporates both exposure concentration and latency, had previously proved useful for modelling the risk of radiographic abnormalities in this cohort. Asbestos dose and smoking were ...

The article presents a comparative analysis of the methods introducing fine perlite into cement systems. first method is dry mixing additive with cement, followed by water polycarboxylate plasticizer. second based on powder stabilized suspension finely dispersed instead water. Before introduction studies its aggregation and sedimentation stability were carried out. It was found that suspensions...

This research paper discusses the influence of zeolite-containing filler Beltau deposit and polycarboxylate superplasticizer on formation porosity cement stone. The results experiments to establish effect plasticizing additive pore size distribution are graphically presented. data obtained confirm feasibility using this type in concrete.

The possibility of improving the physical and mechanical properties Portland cement with maximum clinker savings by optimizing composition hybrid additives is shown. It has been established that combining local mineral ingredients additive artificial origin Phosfozol allow saving low-clinker while maintaining its original grade 400.

In this study, Self-Compacting Concrete (SSC) was produced by using Fly Ash (FA) and Marble Powder (MP), which reduces the amount of cement, causes less damage to environment has some superior properties compared normal concrete. The changes in physical mechanical SSCs with increasing age were investigated. CEM I 42.5 R cement used as a binder production SSC. It FA MP at rates 10%, 20% 30% weig...

Abstract The paper presents studies of cement-ash binder in the composition concrete with use a complex modified additive (CMA). research is aimed at improving conditions for production works, particular, workability mixture based on ash-cement binders. main evaluation criterion study was change viscosity water-binding ratio. measurements were carried out two stages: first stage, influence ash ...