Abstract
With increasing trends towards the broader usage of concrete and warning depletion of natural resources of aggregates, it seems reasonable to find mineral additives or binding materials of different types as ingredient of concrete. Accordingly, wide usage of light weight concrete lies on some main structural applications as reduction of total dead, seismic loads, environmental pollution, and labour cost. This paper tries to investigate the properties of light weight blended concrete containing lime stone powder (LP), micro-silica (MS), pumice, and leca in various proportioning rateing as a partial replacements of cement. Utilization of these additives on the compressive strength, tensile strength, water absorption coefficient, acid resistance, and impact resistance examined experimentally in various curing conditions at the ages of 7 and 28 days to evaluate the combined effect of micro-silica and lime stone incorporation on strength and durability properties of light weight concrete, along with introduction of optimum replacements. For this purpose, 10 lime-stone based concrete mixtures were prepared with proportions from 0 to 20%, and constant values of 10% micro-silica and w/c ratio. From the results, it was indicated that addition of lime stone powder in concrete reduces short-term properties as well as the compressive strength. Optimum levels of powder replacements can serve as sustainable and durable concrete, also environmental and economic benefits.
Highlights
The growing demand for concrete lies on some issues as low costs of constituent materials, construction and maintenance of concrete structures [1]
The results clearly indicate significant weight loss in leca and pumice concretes when cement partially replaced by lime-stone powder, whereby dry weight increased with an increase in replacement levels of lime stone, by average
The results show that resistance of pumice concrete increased due to its relative delay of failure in strong impacts compared to that of a leca concrete sample
Summary
The growing demand for concrete lies on some issues as low costs of constituent materials, construction and maintenance of concrete structures [1]. It was reported that in 2002 about 6.5 billion tonnes of concrete were produced all around the world [2] or annual production of concrete is up to 10 billion tonnes [3]. There may be an estimation to concrete production growing rate up to 18 billion tonnes by 2050 [4]. The process of selecting suitable ingredients of concrete and determining their relative amount with the objective of producing a concrete as economically as possible is well known in many studies, the major part of the energy consumption is related to the Portland cement formation [7, 8]
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