The performance of polymers such as acrylics, styrene-acrylics, styrene-butadiene, ethylene vinyl acetate, type added in cementitious composites are well reported in the literature to boost properties in the fresh mortar stage as workability, anti-bleeding, and hard stage as deformation, adhesion strength, crack bridging, cohesion, durability and reduced water uptake. Polymer treatment was performed in fiber cement boards by adding 5% w/w (dry basis) of styrene-acrylic copolymer aiming to investigate the impact on the mechanical and physical properties at initial curing period (28 days) and after the 200 soak and drying ageing cycles. Dimensional stability at 28 days and the cellulose fiber/cement interface transition zone were assessed by scanning electron microscopy combined with dispersive energy X-ray spectroscopy (EDS). These experiments confirmed that the water absorption value in polymer modified cement boards was reduced by 50% after the ageing cycles when compared to the unmodified boards. Additionally, improvements on board’s rigidity with reduction of modulus of elasticity (MOE) values up to 40% and 15% reduction of board shrinkage was noticed, enhancing boards dimensional stability and preventing fibers from the mineralization process by keeping the cellulose fiber adhered on the cementitious matrix, providing a dense and cohesive fiber-cement interface transition zone after the ageing cycles. This achievement can open important fields of application for the reinforcement of flat panels.
IkaiSReichertJRRodriguesAV, et al.
Asbestos free technology with new high toughness polypropylene (PP) fibers in air-cured hatschek process. Constr Build Mater2010;
24: 171–180.
2.
BurlakovaV. Fiber cement applications in the global building and construction industry. Marketing Assessment DOW, 2017.
3.
AkersAS. Fiber cement industry: a critical review of conversion from asbestos cement to new technology including marketing trends. In: IIBCC conference, China, September 2014.
4.
AkersAS. Fibre cement industry: adaption to modern cements and interrelated process aspects. In: II International Vip business meeting white nights: cement concrete. Dry mixture, May 2013.
5.
BezerraEMJoaquimAPSavastano HJ. Some properties of fiber-cement composites with selected fibers. In: Conferência Brasileira de Materiais e Tecnologias Não- Convencionais: Habitações e Infra-Estrutura de Interesse Social Brasil-NOCMAT, Pirassununga, SP, Brasil, October 2004.
6.
MohrBJNankoHKurtisKE.Durability of kraft pulp fiber–cement composites to wet/dry cycling. Cem Concr Compos2005;
27: 435–448.
7.
CanovasMFSelvaNHKawicheGM.New economical solutions for improvement of durability of Portland cement mortars reinforced with sisal fiber. Mater Struct1992;
25: 417–422.
8.
PizzolVDMendesLMSavastanoH, et al.
Mineralogical and microstructural changes promoted by accelerated carbonation and ageing cycles of hybrid fiber–cement composites. Constr Build Mater2014;
68: 750–756.
9.
PizzolVDMendesLMFrezzattiL, et al.
Effect of accelerated carbonation on the microstructure and physical properties of hybrid fiber-cement composites. Miner Eng2014;
59: 101–106.
10.
BoweMMaxfieldJ. A method of coating an uncured mineral substrate. Applicants: Rohm and Haas Company; Lafarge Braas Research and Development Ltd. EP1006094A2. Application date: 1999.11.10. Publication date: 2000.06.08.
11.
MorinVMoevusMDubois-BruggerI, et al.
Effect of polymer modification of the paste–aggregate interface on the mechanical properties of concretes. Cem Concr Res2011;
41: 459–466.
12.
KnapenEVan GemertD.Film formation in cement mortars modified with water-soluble polymers. Cem Concr Compos2015;
58: 23–28.
MejiaJEBarbiratoGHAFiorelliJ, et al. Evaluation of fibre-cement composites reinforced with experimental polypropylene fibre. In: International inorganic-bonded fiber composites conference,
Fuzhou,
China, November 2016.
15.
RamliMTabassiAA.Effects of polymer modification on the permeability of cement mortars under different curing conditions: a correlational study that includes pore distributions, water absorption and compressive strength. Constr Build Mater2012;
28: 561–570.
16.
Akers AS. Necessity is the mother of invention. In: Concrete solutions conference, Sidney, Australia, March 2009.
17.
TonoliGHDPizzolVDUrreaG, et al.
Rationalizing the impact of aging on fiber–matrix interface and stability of cement-based composites submitted to carbonation at early ages. J Mater Sci2016;
51: 7929–7943.
18.
Rilem TC. 49 tfr: testing method for fibre reinforced cement based composites. Matér Constr1984; 17: 441–459.
19.
ASTM. C 9481-81. Standard test method for dry and wet bulk density, water absorption, and apparent porosity of thin sections of glass-fiber reinforced concrete.
USA:
American Society for Testing and Materials (ASTM), 2009.
20.
SatyanarayanaKGArizagaGGCWypychF.Biodegradable composites based on lignocellulose fibers – an overview. Progr Polym Sci2009;
34: 982–1021.
21.
RostamiVShaoYBoydAJ, et al.
Microstructure of cement paste subject to early carbonation curing. Cem Concr Res2012;
42: 186–193.
22.
WenWYLinJW.Thermal analysis of styrene-alkyl methacrylate polymers II. Thermogravimetric kinetics. J Appl Polym Sci1978;
22: 2285–2293.
23.
Associação Brasileira de Normas Técnicas – NBR 15498: Non-asbestos fibre-cement flat sheets – specification and test methods; placa plana cimentícia sem amianto, requisitos e métodos de ensaio (in Portuguese). 2007; 26: 453.
24.
SantosFSSchmidtRAlmeidaAEFS, et al.
Supercritical carbonation treatment on extruded fibre–cement reinforced with vegetable fibres. Cem Concr Compos2015;
56: 84–94.
25.
Urrea-CeferinoGEPanesarDKSavastanoH.Adjusting curing parameters for innovative and durable vegetable fibrecement composites. Cem Concr Compos2019;
103: 121–133.
26.
EN 494:1994. Fibre-cement profiled sheets and fittings for roofing – products specification and test methods. European Standard, Pilsen.
27.
ChenXWuS.Influence of water-to-cement ratio and curing period on pore structure of cement mortar. Constr Build Mater2013;
38: 804–812.
28.
TonoliGHDBelgacemMNSiqueiraG, et al.
Processing and dimensional changes of cement based composites reinforced with surface-treated cellulose fibres. Cem Concr Compos2013;
37: 68–75.
29.
CorreiaVCSantosSFSavastanoHJ.Effect of the accelerated carbonation in fibercement composites reinforced with eucalyptus pulp and nanofibrillated cellulose. Int J Civil Struct Constr Architect Eng2015;
9: 13.
30.
CallisterDWRethwish GD.Materials science and engineering: an introduction. 8th ed.Hoboken:
John Wiley & Sons Inc., 2012, p. 157.
31.
AligizakiK.Pore structure of cement-based materials: testing, interpretation and requirements. 1st ed.
London:
CRC Press, 2004.
32.
ScrivenerKJuillandPMonteiro PJM.Advances in understanding hydration of Portland cement. Cem Concr Res2015;
78: 38–56.
33.
CorreiaVdCSantosSFMármolG, et al.
Potential of bamboo organosolv pulp as a reinforcing element in fiber-cement materials. Constr Build Mater2014;
72: 65–71.
34.
ChewMYLTanPPYeoYS.Effect of styrene acrylic ester polymer on mortar render properties. Architect Sci Rev2004;
47: 43–52.
35.
TianYJinX-YJinN-G, et al.
Research on the microstructure formation of polyacrylate latex modified mortars. Constr Build Mater2013;
47: 1381–1394.
36.
LothenbachBScrivenerKHootonR.Supplementary cementitious materials. Cem Concr Res2011;
41: 1244–1256.
ZhangBTanHMaB, et al.
Preparation of fine-grinded cement in cement-based material. Constr Build Mater2017;
157: 34–41.
42.
Baoguo MA and Huixian W. Rheological properties of self-compacting concrete paste containing chemical admixtures. Journal of Wuhan University of Technology-Mater 2013; 291–297.
