Abstract
The main objective of this research was studying the effects of using multi types of mineral admixtures as high reactivity Attapulgite (HRA), high reactivity Metakaolin (HRM) and fly ash (FA) on some rheological and mechanical properties of lightweight self - Compacting concrete (LWSCC), when were used as a partially replacement by weight of cement. The results showed that using of (HRA) and (HRM) increased the superplasticizer (SP) dosage, while (FA) with spherical particles reduced the (SP) dosage relative to reference mix (Ref. mix) to get the same slump flow target value. The optimum content for (HRA) used in this study was 10 %, and the percentages of increment in compressive strength and splitting tensile strength relative to (Ref.mix) were (10.0%, 12.2%, 11.15% and 12.3%) and ( 8.8%, 17.46%, 16.34% and 14.66%) for 7, 28, 56 and 90 days respectively. Using of (FA) reduced early age strength, but long term strength increased with (FA) content increases. LWSCC mix contained 10% (HRM) showed a better mechanical properties than both (HRA) and (FA) LWSCC mixes, and the percentages of increment when cement was replaced with 10 % (HRM) relative to (Ref.mix) were (15.0%, 17.6%, 13.9% and 15.7%) and (16.0%, 24.2%, 22.2% and 21.6%) at 7, 28, 56, and 90 days for compressive strength and splitting tensile strength respectively.
Highlights
Lightweight self-Compacting concrete (LWSCC) is one of the latest building material which combines the advantages of lightweight concrete (LWC) and self-consolidating concrete (SCC)
LWSCC mix contained 10% (HRM) showed a better mechanical properties than both (HRA) and (FA) LWSCC mixes, and the percentages of increment when cement was replaced with 10 % (HRM) relative to (Ref.mix) were (15.0%, 17.6%, 13.9% and 15.7%) and (16.0%, 24.2%, 22.2% and 21.6%) at 7, 28, 56, and 90 days for compressive strength and splitting tensile strength respectively
The Aim of the Research is studying the effects of using multi types of mineral admixtures as (HRA), (FA) and (HRM) on some rheological and mechanical properties of LWSCC when were used as a partial replacement by weight of cement
Summary
Lightweight self-Compacting concrete (LWSCC) is one of the latest building material which combines the advantages of lightweight concrete (LWC) and self-consolidating concrete (SCC). Using of LWC in SCC reduces the density of concrete and providing self-consolidating properties [1]. LWSCC provides high-quality structural members with reducing labor. LWSCC can impact the construction cost by reducing the total dead load of the structural members up to 25%, and needing less safekeeping than a similar steel structure [2]. LWSCC can fulfill better strength and durability with excellent workability [3], and its mechanical properties are in general either emulative or better than those in conventional lightweight concrete LWC and SCC [4]. The Aim of the Research is studying the effects of using multi types of mineral admixtures as (HRA), (FA) and (HRM) on some rheological and mechanical properties of LWSCC when were used as a partial replacement by weight of cement
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