Experimental Study Of Polypropylene Fiber Reinforced Self-compacting Lightweight Aggregate Concrete

Numerous researchs have been conducted on lightweight aggregate concrete, self-compacting concrete and self-compacting lightweight aggregate concrete, but researchs on polypropylene fiber reinforced self-compacting lightweight aggregate concrete rarely reported. Self-compacting lightweight aggregate concrete combines the advantages of lightweight aggregate concrete and self-compacting lightweight aggregate concrete. However, because of its tensile and flexural strength, poor impact resistance, easy to shrinkage cracking, brittleness, lack of toughness. People mixed with fiber in the concrete, Due to the mechanical properties of fibers, the bonding performance of fiber and matrix, which play a decisive role for the toughening and crack resistance, increase the effect of the tensile and bending properties. This article from the following four aspects of polypropylene fiber reinforced self-compacting lightweight aggregate concrete were studied over mixture ratio design, workability, mechanical properties and shrinkage.1.This paper designed multiple sets of substrate mixture ratio of mortar by changing water-binder ratio, sand ratio, dosage of fly ash and dosage of superplasticizer, obtained by a large number of experimental studies on the impact of these factors on matrix slurry performance, and finally successfully developed rules Europe (EFNARC) matrix of the mixture ratio of mortar. Then in combination with fixed sand volume method, to join the lightweight aggregate, by changing the dosage of superplasticizer, try to adjust, acpuiring the mixture ratio of self-compacting lightweight aggregate concrete. Adding polypropylene fiber, through the second change the dosage of superplasticizer, with a laboratory test, finally successfully in addition to meet the requirements of the European standard (EFNARC) of polypropylene fiber reinforced self-compacting lightweight aggregate concrete.2.1n this paper, the five groups of different dosage of polypropylene fiber self-compacting lightweight aggregate concrete are made experimental study for polypropylene fiber reinforced self-compacting lightweight aggregate concrete about Slump-flow test, V-funnel test, L-box test, J-ring test and maks an analysis and evaluation for liquidity, segregation resistance of concrete and reinforced the ability, the experimental resultss showed that polypropylene fiber reinforced self-compacting lightweight aggregate concrete has good performance on workability, meet the European standard (EFNARC) performance evaluation criteria of the standard.3.In this paper, the five groups of different dosage of polypropylene fiber self-compacting lightweight aggregate concrete had compressive strength, splitting tensile strength and flexural strength test. The following aspects are tested about the five groups of different dosage of polypropylene fiber self-compacting lightweight aggregate concrete: compressice strength, split tensile strength, rupture strength. The experimental results shows that with the increase of polypropylene fiber, the compressive strength increases first and then decreases phenomenon and splitting tensile strength and compressive strength changes consistent. Rupture strength and folding pressure ratio are increasing with the increase of polypropylene fiber content.4.CABR-NES type non-contact meter concrete shrinkage deformation are used to shrinkage performance of self-compacting lightweight aggregate concrete and polypropylene fiber content is0.06%of self-compacting lightweight aggregate concrete. The resultss show that as the growth of the age, self-compacting lightweight aggregate concrete specimen appeared swell,5days expansion value maximum, swelling strain was1011με, to16days began to shrink,38days of shrinkage strain for234με. And polypropylene fiber content is0.06%of self-compacting lightweight aggregate concrete expansion value maximum in the third day, swelling strain is80με, and11days began to shrink, shrinkage strain of22days for193με.