Production of Controlled Low Strength Material Utilizing Waste Paper Sludge Ash and Recycled Aggregate Concrete

A N Azmi,M D Nor,M F Arshad,A R M Ridzuan,M A Fauzi,N Abd Rahman,R Yunus,S.N Rahmat,Z Mohd Jaini

doi:10.1051/matecconf/20164701011

Abstract

Recently, the best method to make the concrete industry more sustainable was using the waste materials to replace the natural resources. Currently waste paper sludge is a major economic and environmental problem in this country. In this research, the alternative method is to dwindle the usage of natural resources and the usage of cement in the construction. This method is to replace the usage of cement with the waste paper sludge ash (WPSA) and to use the recycle aggregate collected from the construction is used. The WPSA has ingredient likely cement such as self-cementation but for a low strength. The research was conducted at heavy laboratory UITM Pulau Pinang. Meanwhile, the WPSA is collected at MNI Industries at Mentakab, Pahang. The recycle aggregate is a separated half, which were fine aggregate and the coarse aggregate with the specific size. In this research, the ratio is divided into two (2) which is 1:1 and 1:2 for the aggregate and difference percentage levels of WPSA. The percentage levels of WPSA that use in this research are 10%, 20%, 30%, 40%, 50%, and 60%. A total of 36 cubes were prepared. Aim of this research is to develop a simple design approach for the mixture proportioning of WPSA and recycle concrete aggregate (RCA) within the concrete and to assess the effect of concrete mix with different percentage of WPSA and RCA ratio on the properties. It is found that the best design mix that achieves control low strength material (CLSM) is on 30% of WPSA with the ratio 1:2 on day 28 of compression test.

Highlights

control low strength material (CLSM) is a self-compacted or cementation material that used to backfill as an alternative to compacted fill
This type of material has several of names like flowable fill, lean-mix backfill, unshrinkable fill, flowable mortar, and controlled- density fill (CDF) but the name of Controlled Low Strength Material (CLSM) has been given by American Concrete Institute (ACI) Committee 229 [14]
The recycle concrete aggregate (RCA) and waste paper sludge ash (WPSA) are used to get low strength called as control low strength material (CLSM)

Summary

Introduction

CLSM is a self-compacted or cementation material that used to backfill as an alternative to compacted fill. Other advantages for CLSM that used by product material such as fly ash and foundry sand that can reduce the utilizing of landfills. WPSA was use to replace the existing by product material to produce CLSM. Singapore country nowadays forced to import the natural sources like an aggregate from overseas because their country shortage of the natural sources for their construction industries .Beside that, it would burden to the government and unable to achieve economic growth and comfortable living for the future generations [3]. The recycled material collected from the construction industries results from the demolited and renovated of buildings were used in the concrete mix. The RCA and waste paper sludge ash (WPSA) are used to get low strength called as control low strength material (CLSM).

Preparation of materials

Compressive strength test

Results and Discussions

Compressive strength of CLSM concrete

Conclusions