جستجوی مقالات مرتبط با کلیدواژه « compacting concrete (scc) » در نشریات گروه « عمران »

The objective of the present investigation was to evaluate RHA and MK as supplementary cementitious materials (in both binary and ternary systems) in terms of harden properties in blended cement SCC and to identify the optimal level of replacement of ordinary Portland cement (OPC) with RHA, MK, or RHA+MK. The blended cements were prepared by replacing OPC with RHA, MK, or RHA+MK (5–40%) in dry conditions. In addition to that the interrelationship between harden properties such as compressive strength and ultrasonic pulse velocity was discussed.

This paper presents an experimental study of the influence of the viscosity modifying agent and the different mineral additions (limestone filler, natural pozzolana and slag) on the rheological properties (fluidity, deformability and stability) and compressive strength of self-compacting concrete (SCC). The workability of fresh SCC was measured using slump test, L-Box and sieve stability test. The compressive strength was determined on samples (160×320 mm) at the ages of 28 days. The results have allowed us to develop a range of SCC that can fill the formwork heavily armed without vibrations and have of the compressive strengths acceptable. The incorporation of superplasticizer (SP) increases the fluidity and deformability but reduces slightly the stability and compressive strength. For cons, adding a viscosity modifying agent (VA) is quite contrary. Loss of fluidity and deformability caused by adding a VA can be recovered by adding a SP without affecting the stability and compressive strength. However, high dosages of VA, the effect of SP is limited, or in other words, it is mainly related to dosage used of VA. The use of a dosage (VA = 0.03%) is sufficient to assure the best properties and with this dosage, SCC require reasonable quantities of SP.

The development of self-compacting concrete marks an important mile stone in improving the product quality and efficiency of building industry. SCC homogeneously spreads due to its own weight, without any additional compaction energy and does not entrap air. The required flowability is achieved by using more fines (cement +filler) and reducing coarse aggregate content. The present research work was aimed to develop SCC by using Lime stone quarry fines and fly ash as filler and to study its effect on abrasion resistance of Self Compacting concrete. The test results indicate that the SCC mixes with lime stone quarry fines and fly ash significantly improved the depth of wear, compressive strength, tensile strength and flexural strength.