The article studies the effect of complex chemical additives on water demand cement, setting time cement paste, consumption and KJ-3 viscosity concrete mixture, also determines normal density paste without additive with plasticizing rheological characteristics mixture KJ- 3.

In this study, we analyzed the strength and shrinkage properties of concrete with three additives, superabsorbent polymer (SAP), calcium sulfoaluminate (CSA) clinker, shrinkage-reducing admixture (SRA), to verify internal curing reduction effects. According compressive tests, use SAP as an additive resulted in a slight decrease strength, whereas using 10% CSA clinker 8 MPa higher than that ordi...

To increase the resistance to fungal corrosion and improve performance of concrete cement stone, it is proposed introduce calcium stearate active metal nitrates in an amount 0.5% by weight into mixture at manufacturing stage. determine degree damage stone microorganisms Aspergillus niger, porosity, density, water absorption strength were determined. It has been found that introduction a hydroph...

One of the concrete technologies developed to obtain good compressive strength is additional material for iron lathe waste obtained from residue turning process. This study aims determine effect as a fine aggregate additive on concrete. The test was carried out based SNI standard 1974:2011. sample making specimens by varying 0%, 1.5% and 2.5% weight in mixture with 29.05 MPa. Concrete samples w...

Building materials are significant contributor of indoor radon after the soil. The indoor radon level depends upon the radon flux coming out from wall, ceiling and roofs of the dwellings. The radon flux from the wall that in most cases is concrete depends upon many factors like radium content, porosity, moisture, composition of mix design for construction of concrete and age of concrete. The pr...

ID Number: 343

The possibility of producing fiber-reinforced concrete with high deformation properties by regulating the microstructure and using it in design transport structures was considered. It found that to create high-performance structures, is necessary modify fiber mixtures complex additives, i. e. increase strength at micro-level. To obtain a denser structure matrix, additives were used – ultrafine ...

We examine non-destructive testing (NDT) techniques that characterize the interlayer bond quality of idealized 3-D printed concrete, simulating a layup bond, in-situ. An experimental study evaluates four NDT methods (x-ray radiography, ultrasonic pulse velocity (UPV), vibration resonance, and multi-element array ultrasonics) to idealized, layered concrete specimens simulate layers structure. Th...